Spirulina supported plant growth in regolith simulants and elevated levels of CO2

May combine two claims.

Both lunar and Martian regolith lack water-carrying capacity.

“In addition, both lunar and Martian regolith lack water-carrying capacity (Wamelink et al., 2014).”

• cites Wamelink et al., 2014 sourceDisputed

  The Discussion (page unavailable) says the Martian soil simulant held water better than the lunar simulant and Earth control, while the lunar simulant dried out fastest. The paper calls for further research on the physical characteristics of actual extraterrestrial soils; it does not establish that both regoliths lack water-holding capacity. (LLM, conf=0.87)

  Checked by a reasoning model — may be wrong.

  Experimental — accuracy not yet measured

May combine two claims.

Growth rates in regolith simulants tend to be slower and plants often exhibit signs of phenotypic stress.

“However, growth rates tend to be slower, and plants often exhibit signs of phenotypic stress (Paul et al., 2022), including a decline in telomere dynamics and a loss of sustainable genome integrity (Barcenilla et al., 2024).”

• cites Paul et al., 2022 sourceDisputed

  In “Plant growth in three sources of lunar regolith” (page not provided), the paper reports that plants in actual Apollo lunar regolith grew more slowly and sometimes showed stress phenotypes. It says the opposite about the JSC-1A simulant: those plants maintained a consistently higher growth rate. The claim reverses which substrate produced the slower, stressed plants. (LLM, conf=0.88)

  Checked by a reasoning model — may be wrong.

  Experimental — accuracy not yet measured
• cites Barcenilla et al., 2024 sourcePartly supported

  The Results report shorter telomeres and reduced telomerase activity in Arabidopsis grown in lunar regolith simulant. The paper describes long-term genome integrity as potentially unsustainable, not as an observed loss. The slower growth and phenotypic stress in the citing sentence are attributed to Paul et al. (2022), not to this source. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

Regolith lacks a natural biome and is deficient in essential macronutrients such as nitrogen and micronutrients including copper, zinc, and boron.

“Unlike terrestrial soil, it lacks a natural biome and is deficient in essential macronutrients such as nitrogen, as well as key micronutrients including copper, zinc, and boron (Eichler et al., 2021;Duri et al., 2022).”

• cites Eichler et al., 2021 sourceNot checked — no full text of the source
• cites Duri et al., 2022 sourcePartly supported

  The Abstract says regolith lacks a microbiome, and the Conclusion says simulants lack key macronutrients including nitrogen. Section 3 describes copper, zinc, and boron as potentially deficient, while §2.2 says they occur in trace concentrations in minerals; the paper does not establish the categorical micronutrient deficiency stated in the claim. (LLM, conf=0.85)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Spirulina is part of the Microcoleaceae family, known for its nutritional properties and rapid growth.

“Spirulina is part of the Microcoleaceae family, known for its nutritional properties and rapid growth (Fais et al., 2022).”

• cites Fais et al., 2022 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

In terrestrial soils, Microcoleaceae contribute to soil aggregation and stability.

“In terrestrial soils, they contribute to soil aggregation and stability (Rashid et al., 2016), increase the water-holding capacity and nutrient content of degraded soils (Singh et al., 2016), and enhance salt tolerance, disease resistance, and polysaccharide production (Singh, 2014).”

• cites Rashid et al., 2016 sourcePartly supported

  Sections 4.1 and 4 describe how bacteria contribute to soil aggregate formation and stability. The paper does not identify Microcoleaceae or establish that this particular family has that role; the citation supports the general mechanism, not the taxon-specific claim. (LLM, conf=0.85)

  Experimental — accuracy not yet measured

May combine two claims.

Under terrestrial conditions, spirulina fertilization enhances photosynthetic pigment content and improves growth and yield rates.

“Under terrestrial conditions, plants fertilized with spirulina exhibit increased biomass (Singh, 2014), enhanced photosynthetic pigment content, improved growth and yield rates (Shedeed et al., 2022), greater productivity including marketable yield and nitrogen fixation (Geries and Elsadany, 2021), and elevated micronutrient content (Anitha et al., 2016).”

• cites Shedeed et al., 2022 sourcePartly supported

  The Abstract reports increased photosynthetic pigments, growth and yield in Lupinus luteus treated with 0.25% Spirulina extract. It also reports that 1.0% inhibited growth. The citing sentence generalizes the benefit to plants fertilized with Spirulina without the species and concentration qualifications. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Under terrestrial conditions, spirulina fertilization elevates micronutrient content.

“Under terrestrial conditions, plants fertilized with spirulina exhibit increased biomass (Singh, 2014), enhanced photosynthetic pigment content, improved growth and yield rates (Shedeed et al., 2022), greater productivity including marketable yield and nitrogen fixation (Geries and Elsadany, 2021), and elevated micronutrient content (Anitha et al., 2016).”

• cites Anitha et al., 2016 sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Microcoleaceae increase water-holding capacity and nutrient content of degraded soils.

“In terrestrial soils, they contribute to soil aggregation and stability (Rashid et al., 2016), increase the water-holding capacity and nutrient content of degraded soils (Singh et al., 2016), and enhance salt tolerance, disease resistance, and polysaccharide production (Singh, 2014).”

• cites Singh et al., 2016 sourcePartly supported

  The sections on cyanobacteria under extreme environments and reclamation of salt-affected soils say cyanobacteria can improve soil water-holding capacity and raise carbon and nitrogen levels in poor soils. The paper identifies Microcoleus chthonoplastes as a cyanobacterium in Table 1, but does not establish these effects specifically for Microcoleaceae. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Plant growth in lunar and Martian regolith simulants is possible when nutrient supplementation is provided, particularly for simulants with lower pH levels.

“Their findings show that growth is possible when nutrient supplementation is provided, particularly for simulants with lower pH levels (Eichler et al., 2021;Chinnannan et al., 2023).”

• cites Eichler et al., 2021 sourceNot checked — no full text of the source
• cites Chinnannan et al., 2023 sourcePartly supported

  The Introduction reports that nutrient-supplemented lunar and Martian regolith simulants can support sweet potato growth, citing a prior study. The Discussion says supplementation is necessary for crop growth in Martian simulant. Neither passage links better growth to lower simulant pH, and the lunar-and-Martian finding is reported from prior work rather than this paper’s own experiment. (LLM, conf=0.88)

  Experimental — accuracy not yet measured

May combine two claims.

Microcoleaceae have been shown to improve soil fertility and support healthy plant growth.

“Microcoleaceae have been shown to improve soil fertility and support healthy plant growth (Singh et al., 2016;Shariatmadari et al., 2013;Rai et al., 2019).”

• cites Singh et al., 2016 sourcePartly supported

  The ‘Cyanobacteria in Sustainable Management’ section says cyanobacteria can restore soil fertility and stimulate plant growth; the ‘Plant Growth Promoters’ section describes reported growth benefits. The paper lists Microcoleus chthonoplastes among cyanobacteria, but the cited passages do not establish these benefits specifically for Microcoleaceae. Page numbers are unavailable in our copy. (LLM, conf=0.84)

  Experimental — accuracy not yet measured
• cites Shariatmadari et al., 2013 sourcePartly supported

  The Results ('Cyanobacterial extracts as inoculants for vegetable crops'; page unavailable) report improved growth in vegetables treated with cyanobacterial extracts. But the Discussion identifies the studied Anabaena and Nostoc as members of Nostocaceae, not Microcoleaceae. Its discussion of soil fertility also concerns cyanobacteria generally or Nostoc, so it does not establish the claim for Microcoleaceae. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites Rai et al., 2019 sourceNot checked — no full text of the source

May combine two claims.

Elevated CO2 reduces transpiration and produces plants with lower nutritional content, including smaller percentages of nitrogen, zinc, iron, and protein.

“Elevated levels of CO 2 have been shown to reduce transpiration and produce plants which have lower nutritional content with smaller percentages of nitrogen, zinc, iron, and protein (Loladze, 2002;Myers et al., 2014;Morison and Lawlor, 1999).”

• cites Loladze, 2002 sourceNot checked — no full text of the source
• cites Myers et al., 2014 sourcePartly supported

  In “Rising CO2 threatens human nutrition” (page not provided), the paper reports lower zinc and iron concentrations in C3 grasses and legumes and lower protein in C3 grasses grown under elevated CO2. It discusses changes in nitrogen content and proposes reduced transpiration-driven nitrogen transport as a possible mechanism, but does not establish that transpiration was reduced or report lower nitrogen percentages across plants. The claim also omits the paper’s limits: protein was not significantly reduced in soybeans or C4 crops. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites Morison and Lawlor, 1999 sourceNot checked — no full text of the source

May combine two claims.

In stressed soils, spirulina treatments have led to increases in yield production, improved photosynthetic rates, and decreased oxidative as well as DNA damage.

“In stressed soils, spirulina treatments have led to increases in yield production, improved photosynthetic rates, and decreased oxidative as well as DNA damage (Taha et al., 2023).”

• cites Taha et al., 2023 sourceSupported

May combine two claims.

For radish plants, application of spirulina leads to increased root length, wet mass, and chlorophyll content.

“For radish plants in particular, the application of spirulina leads to increased root length, wet mass, and chlorophyll content (Godlewska et al., 2019).”

• cites Godlewska et al., 2019 sourcePartly supported

  The section on morphological indicators of radish seedlings reports increased above-ground length and examines wet mass; the Discussion reports treatments with the highest wet mass and chlorophyll content. The cited paper does not establish increased root length: its length measurements concern above-ground biomass (page numbers unavailable). (LLM, conf=0.90)

  Experimental — accuracy not yet measured

May combine two claims.

In terrestrial studies, elevated CO2 levels have shown increased plant growth and leaf production as well as reduced water usage.

“In terrestrial studies, elevated levels of CO 2 have shown increased plant growth and leaf production as well as reduced water usage (Prior et al., 2011).”

• cites Prior et al., 2011 sourcePartly supported

  The PLANT GROWTH section says elevated CO₂ increases plant growth, and PLANT WATER RELATIONS reports reduced transpiration. The retrieved passages do not establish increased leaf production. They also caution that reduced transpiration does not always mean reduced whole-plant water use: larger plants can use more water despite improved water-use efficiency (page not available in our copy). (LLM, conf=0.88)

  Experimental — accuracy not yet measured

May combine two claims.

Growth in ambient CO2 was slightly higher during the plateau period than in elevated CO2 for all plant groups except those receiving 1.4% spirulina, where the trend was reversed.

“Growth in ambient CO 2 is slightly higher during the plateau period than in elevated CO 2 for all plant groups except those which received the 1.4% spirulina treatment, where the trend is reversed (Figure 7).”

May combine two claims.

ANOVA confirmed variance was between groups, not within groups, supporting no significant difference for different soil-to-regolith simulant mixtures.

“The ANOVA tests confirm that the variance is between groups, not within groups; this supports the statement that there is no significant difference observed for the different soil-to-regolith simulant mixtures.”

May combine two claims.

In 100% regolith simulants, water-only groups had significantly lower growth than spirulina-treated groups at both ambient and high CO2, for both lunar and Martian simulants.

“For these plant groups, the water-only groups demonstrate significantly lower levels of growth during both the initial growth phase and the plateau period compared with plants which received the spirulina treatment (t (46) = 6.76, p < 0.001 (lunar); t (36) = 4.96, p < 0.001 (Martian) at ambient CO 2 ; t (46) = 10.05,p < 0.001 (lunar); t (47) = 9.03, p < 0.001 (Martian) at high CO 2 ).”

May combine two claims.

For spirulina-treated plants, higher growth rates were seen in Martian simulant for all spirulina concentrations at ambient CO2, but no noticeable difference between lunar and Martian simulants at high CO2.

“For the spirulina-treated plants, higher growth rates are seen for the plants grown in Martian regolith simulant for all spirulina concentrations at ambient CO 2 ; there is no noticeable difference between growth in lunar and Martian regolith simulants for any concentration of spirulina at high CO 2 .”

May combine two claims.

Water-only plants showed a bell curve-like growth profile in volume, demonstrating decline in overall plant growth over time.

“The water-only plants show a bell curve-like growth profile; the volume measurements clearly demonstrate the decline in overall plant growth over time (see Figure 13).”

May combine two claims.

Plant volume in Martian simulant showed similar trends but volumes were reduced by 15% for plants grown in ambient CO2, and increased by 35%-40% for groups grown in elevated CO2.

“Plants grown in Martian regolith simulant show similar trends but with volumes reduced by 15% for plants grown in ambient CO 2 ; plant volume increases by 35%-40% for groups grown in elevated CO 2 (Figure 12).”

May combine two claims.

Post-hoc Tukey HSD found significant differences between 0.2% and 0.6% spirulina groups (p<0.01) for all conditions, and between 0.2% and 1.4% groups for both simulant types at high CO2 (p<0.01).

“Significance is also seen between the 0.2% solution and the 0.6% spirulina groups (p < 0.01) for all conditions and between the 0.2% and 1.4% spirulina groups for both types of regolith simulant at high concentrations of CO 2 (p < 0.01).”

May combine two claims.

Plants grown at ambient CO2 showed more yellowing with time, while plants at high CO2 showed more yellowing initially but then became gradually greener.

“In addition, plants grown at ambient levels of CO 2 show more yellowing with time while plants grown at high levels of CO 2 show more yellowing initially but then become gradually greener.”

May combine two claims.

General yellowing as a function of time was noted for all runs, most noticeable for plants grown in lunar simulant compared to Martian.

“A general yellowing as a function of time is noted in the table for all runs, although the yellowing is most noticeable for plants grown in lunar regolith simulant compared to Martian.”

May combine two claims.

At ambient CO2, plants grown in lunar simulant yielded larger wet and dry weights than Martian simulant, with difference significant only for the 0.6% spirulina concentration (t(14)=1.76, p=0.034).

“The plants grown in lunar regolith simulant yield larger weights than their counterparts grown in Martian regolith simulant for both wet and dry weights at ambient levels of CO 2 , although the difference is only significant for the plants which received the 0.6% spirulina concentration (t (14) = 1.76, p = 0.034).”

May combine two claims.

Plants fertilized with 0.2% spirulina grew 1.4 times more leaves, and those with 0.6% resulted in 1.5 times more leaves than controls.

“Plants fertilized with 0.2% spirulina grew 1.4 times more leaves; those fertilized with the 0.6% solution resulted in 1.5 times more leaves than the controls.”

May combine two claims.

For high CO2 runs, there was a significant difference at the 99th percentile between plants fertilized with 0.2% vs 0.6% spirulina for both lunar (t(7)=1.89, p<0.001) and Martian (t(9)=1.83, p=0.004) simulants.

“For the high CO 2 runs, there is a significant difference at the 99th percentile between plants fertilized with the 0.2% spirulina solution compared to 0.6% for both lunar (t (7) = 1.89, p < 0.001) and Martian (t (9) = 1.83, p = 0.004) regolith simulant.”

May combine two claims.

PCA showed plants grown in Martian simulant with 0.6% spirulina had the strongest median growth, while 1.4% spirulina showed diminished performance in both simulant types.

“Plants grown in Martian regolith simulant with 0.6% spirulina exhibit the strongest median growth, while those which received the 1.4% spirulina treatment show diminished performance in both regolith simulant types.”

May combine two claims.

At ambient CO2, water-only groups showed a declining vertical growth trend after day 24, while spirulina-treated groups showed stable or slightly increasing trends throughout the growth period.

“The water-only groups show a declining trend after day 24 (slope = -0.051(lunar); -0.10 (Martian)), while the groups treated with the spirulina show either stable (0.2% spirulina solution; slope = 0.047 (lunar); 0.080 (Martian)) or slightly increasing trends (0.6% and 1.2% spirulina solutions; slope = 0.11 (lunar); 0.20 (Martian)) throughout the entire growth period.”

May combine two claims.

For water-only groups, plants grown in Martian simulant at elevated CO2 showed higher growth rates than those in lunar simulant during the plateau period, while both declined.

“For the water-only groups, plants grown in Martian regolith simulant at elevated CO 2 show higher growth rates compared to those in lunar regolith simulant during the plateau period, although plants in both types of regolith simulants show a clear decline during this period (Figure 9).”

May combine two claims.

In 100% regolith simulants, plant growth increased with increasing spirulina concentration, most noticeably under high CO2 and in Martian compared to lunar simulant.

“Plant growth increases with increasing concentration of spirulina solution; this increase is most noticeable for plants grown under conditions of high CO 2 and for plants grown in Martian regolith simulant compared to lunar.”

May combine two claims.

At high CO2, the trend reversed for wet/dry weights between lunar and Martian simulants, but differences were not significant.

“The trend reverses for plants grown at high levels of CO 2 , although the differences between plants grown in lunar and Martian regolith simulant are not significant (see Figure 14).”

May combine two claims.

For water-only and 0.2% spirulina groups, slightly higher growth was maintained under ambient CO2 compared to high CO2; this trend reversed for 0.6% and 1.4% spirulina groups.

“For the water-only groups and those which received the 0.2% concentration of spirulina, slightly higher growth is maintained for the groups grown under ambient CO 2 concentrations compared to high CO 2 ; this trend reverses for the groups which received 0.6% and 1.4% spirulina solutions.”

May combine two claims.

The 1.4% spirulina solution supported the highest initial growth rates but plateaued at the level of the 0.6% solution.

“The 1.4% spirulina solution supports the highest growth rates initially, but plateaus at the level of the 0.6% solution.”

May combine two claims.

PCA showed growth in lunar simulant with 0.2% spirulina produced extreme outliers, suggesting dose-response variability.

“Growth in lunar regolith simulant with 0.2% spirulina produces extreme outliers, suggesting dose-response variability.”

May combine two claims.

The 0.6% and 1.4% spirulina groups differed significantly (p<0.01) for both lunar and Martian simulants in high CO2 runs, but not in ambient CO2 runs.

“The 0.6% and 1.4% spirulina groups differ significantly (p < 0.01) for both lunar and Martian regolith simulant mixtures for the high CO 2 runs, but do not differ significantly for the ambient CO 2 runs.”

May combine two claims.

Two-way ANOVA revealed significant main effects of spirulina dosage and CO2, and a significant interaction effect on growth.

“A two-way ANOVA reveals a significant main effect of spirulina dosage (F (2,36) = 18.02, p < 0.001); a significant main effect of CO 2 (F (1,36) = 9.84, p = 0.003); and a significant interaction effect (F (2,36) = 4.65, p = 0.016).”

May combine two claims.

At ambient CO2, the 0.2% spirulina group differed significantly (p<0.05) from the 1.4% group for lunar simulant, but no significant difference was found for Martian simulant.

“At ambient levels of CO 2 , the 0.2% spirulina group differs significantly (p < 0.05) from the 1.4% spirulina group for lunar regolith simulant; no significant difference is found between the 0.2% and 1.4% solutions for the Martian regolith simulant mixtures.”

May combine two claims.

Plants receiving lower concentrations of spirulina tended to be yellower and less healthy.

“Plants which received lower concentrations of spirulina treatment tend to be yellower and less healthy.”

May combine two claims.

Plants showed signs of stress over time, including leaf yellowing, faster initial growth rates, light-seeking behaviors, and lack of flowering/seed production.

“but showed signs of stress over time, including leaf yellowing, faster initial growth rates, light-seeking behaviors, and lack of flowering/seed production.”

Classified as probably not a substantial claim.

Harvest wet and dry weights and root measurements also support this trend.

“Harvest wet and dry weights and root measurements also support this trend.”

May combine two claims.

Measured leaf color indicated the lunar plants were slightly more stressed compared with the Martian; the plants grown in Martian registered at a healthier level on the color scale.

“As an indication of both plant health and chlorophyll production, the measured leaf color indicated the lunar plants were slightly more stressed compared with the Martian; the plants grown in Martian registered at a healthier level on the color scale.”

• AssumptionRests on an assumption: Leaf color is a valid qualitative measure of photosynthesis and plant health.

May combine two claims.

Significant yellowing occurred for plants grown under the highest CO2 levels, indicative of diminished transpiration.

“Significant yellowing occurred for plants grown under the highest CO 2 levels, indicative of diminished transpiration (Morison and Lawlor, 1999).”

• cites Morison and Lawlor, 1999 sourceNot checked — no full text of the source

May combine two claims.

Spirulina significantly enhanced plant biomass and height, especially when paired with elevated CO2 levels.

“Spirulina significantly enhanced plant biomass and height, especially when paired with elevated CO 2 levels.”

May combine two claims.

In each case, plants that received spirulina treatment showed larger growth metrics and healthier leaves than those that only received water, and growth was sustained well beyond the point where nutrition from the seed was exhausted.

“In each case, the plants that received the spirulina treatment showed larger growth metrics and healthier leaves than those that only received water, and growth was sustained well beyond the point where nutrition from the seed was exhausted.”

May combine two claims.

Water-only control plants struggled but did grow, reaching the lowest plant heights and leaf counts, and showed the most yellowing and the fewest seeds produced.

“These plants struggled, but did grow, reaching the lowest plant heights and leaf counts.”

• Also stated in: § 4.1 Efficacy of spirulina treatment · plain

  “They showed the most yellowing and the fewest seeds produced.”

May combine two claims.

Water-only groups declined after the initial growth phase; spirulina fertilized groups maintained steady growth rates over the full growing period.

“Water-only groups declined after the initial growth phase; spirulina fertilized groups maintained steady growth rates over the full growing period.”

May combine two claims.

Root systems showed substantial growth and were generally healthy.

“Root systems showed substantial growth and were generally healthy.”

May combine two claims.

Plants grown in 100% regolith simulant with consistent moisture performed well and developed nearly pristine root caps.

“Despite this, plants grown in 100% regolith simulant with consistent moisture maintained performed well and developed nearly pristine root caps.”

May combine two claims.

Seed formation was rare but present, with three pods produced in the water-only, high-CO2 tent, and several seeds observed in high-CO2 spirulina groups during the July/August run.

“Seed formation was rare, but present, with three pods produced in the water-only, high-CO 2 tent, and several seeds observed in high-CO 2 spirulina groups during the July/August run.”

May combine two claims.

Growth in lunar regolith simulant was generally comparable to growth in Martian regolith simulant, but plant health metrics were better for plants grown in Martian regolith simulant in high CO2 environments.

“Overall, growth in lunar regolith simulant was generally comparable to growth in Martian regolith simulant, but plant health metrics, as evidenced by leaf count, leaf color, and visual inspection of the plants, were better for plants grown in Martian regolith simulant in high CO 2 environments.”

May combine two claims.

Plants that received spirulina treatment experienced more growth and greater plant health than water-only controls.

“In contrast, the plants that received the spirulina treatment experienced more growth and greater plant health.”

May combine two claims.

Spirulina boosts growth for radish microgreens significantly; Martian regolith simulant with 0.6% spirulina under elevated CO2 yielded the best results.

“Spirulina boosts growth for radish microgreens significantly; Martian regolith simulant with 0.6% spirulina under elevated CO 2 yielded the best results.”

May combine two claims.

Application of aqueous spirulina solution led to healthier plant growth in both regolith simulants under different levels of environmental CO2 as evidenced by plant height, plant volume, and leaf count and colour, over a full seed-to-flowering cycle, with limited seed formation only in the high-CO2 tents.

“Application of aqueous spirulina solution led to healthier plant growth in both regolith simulants under different levels of environmental CO 2 as evidenced by plant height, plant volume, and leaf count and colour, over a full seed-toflowering cycle, with limited seed formation only in the high-CO 2 tents.”

May combine two claims.

All concentrations of spirulina solutions resulted in healthier plants and higher growth rates.

“All concentrations of spirulina solutions resulted in healthier plants and higher growth rates.”

May combine two claims.

Stress effects were more pronounced for the water-only groups and for the elevated CO2 groups.

“These effects were more pronounced for the water-only groups and for the elevated CO 2 groups.”

May combine two claims.

The addition of two small fans alleviated the yellowing issue and allowed the plants to maintain photosynthetic rates as indicated by leaf color.

“The addition of two small fans alleviated the issue and allowed the plants to maintain photosynthetic rates as indicated by leaf color.”

May combine two claims.

Regolith simulant type influenced biomass more than height, with the best growth found in Martian rather than lunar regolith simulant.

“Regolith simulant type influenced biomass more than height, with the best growth found in Martian rather than lunar regolith simulant.”

May combine two claims.

The use of lunar and Martian regolith simulants yielded similar height and volume results for the plants, while plants were somewhat healthier when grown in the Martian regolith simulant, but the difference was not large.

“The use of lunar and Martian regolith simulants yielded similar height and volume results for the plants; while plants were somewhat healthier when grown in the Martian regolith simulant, the difference was not large.”

May combine two claims.

Under elevated CO2 conditions, the mean dry biomass of radish microgreens was 1.02 g in the control group, 1.45 g for the 3 g spirulina group, and 1.73 g for the 7 g spirulina group.

“Under elevated CO 2 conditions, the mean dry biomass of radish microgreens increases from 1.02 g in the control group to 1.45 g for the 3 g spirulina group and peaks at 1.73 g for the 7 g spirulina group.”

May combine two claims.

While the spirulina fertilizer supplied sufficient nutrition to sustain plant growth over the growing cycle, it did not fully compensate for the environmental stressors.

“While the spirulina fertilizer supplied sufficient nutrition to sustain plant growth over the growing cycle, it did not fully compensate for the environmental stressors.”

May combine two claims.

In ambient CO2 conditions, the mean dry biomass of radish microgreens was 0.94 g in the control group, 1.26 g for the 3 g spirulina group, and 1.45 g for the 7 g spirulina group.

“In ambient CO 2 conditions, the corresponding values are slightly lower: 0.94 g (control), 1.26 g (3 g), and 1.45 g (7 g).”

May combine two claims.

The data for 1.4% spirulina plants grown in lunar simulant at ambient CO2 did not fit the trends shown but represented only 44 days of growth compared with 64 days for other runs.

“The data for the 1.4% spirulina plants grown in lunar regolith simulant at ambient CO 2 does not fit the trends shown but represents only 44 days of growth compared with 64 days for the other runs.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Temperature and humidity were held at approximately 26.7 °C and 75% RH.

“Temperature and humidity were continuously monitored using a Temp Stick IoT sensor (Ideal Sciences, model TS-01), with values held at approximately 26.7 ° C and 75% RH, respectively.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims. The quote only partly states this claim.

Plants were grown in mixed substrates rather than pure simulants due to the sphagnum moss liner, and this limitation is acknowledged.

“While it improved hydration, it means plants were grown in mixed substrates rather than pure simulants.This limitation is acknowledged.”

Probably not a substantial claim: may not pass S3 (load-bearing).

The accuracy with which manufactured simulants mimic actual lunar and Martian regolith has been called into question.

“The accuracy with which manufactured simulants mimic actual lunar and Martian regolith has been called into question (Eichler et al., 2021).”

• cites Eichler et al., 2021 sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

These results align with plant growth studies on the ISS, where environmental CO2 levels are elevated compared to atmospheric values on Earth.

“These results align with plant growth studies on the ISS (where environmental CO 2 levels are elevated compared to atmospheric values on Earth) described earlier in the paper.”

May combine two claims.

Under terrestrial conditions, spirulina fertilization increases productivity including marketable yield and nitrogen fixation.

“Under terrestrial conditions, plants fertilized with spirulina exhibit increased biomass (Singh, 2014), enhanced photosynthetic pigment content, improved growth and yield rates (Shedeed et al., 2022), greater productivity including marketable yield and nitrogen fixation (Geries and Elsadany, 2021), and elevated micronutrient content (Anitha et al., 2016).”

• cites Geries and Elsadany, 2021 sourceNot checked — no full text of the source

May combine two claims.

The initial high rate of growth reflects sustainment from the seed, while growth during the plateau period represents the plant's ability to thrive based on nutrition absorbed from the soil and fertilization.

“The initial high rate of growth demonstrated reflects sustainment from the seed, while the growth during the plateau period represents the plant's ability to thrive based on nutrition absorbed from the soil and fertilization.”

May combine two claims.

The main differences in plant growth metrics are likely due to the water-carrying capacities and compaction of the regolith simulant; water-carrying capacity is higher for the Martian regolith simulant used, while compaction is higher for the lunar regolith simulant used.

“The main differences in plant growth metrics are likely due to the water-carrying capacities and compaction of the regolith simulant; the former is higher for the Martian regolith simulant used in this study, which the latter is higher for the lunar regolith simulant used.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Microcoleaceae enhance salt tolerance, disease resistance, and polysaccharide production.

“In terrestrial soils, they contribute to soil aggregation and stability (Rashid et al., 2016), increase the water-holding capacity and nutrient content of degraded soils (Singh et al., 2016), and enhance salt tolerance, disease resistance, and polysaccharide production (Singh, 2014).”

• cites Singh, 2014 sourceNot checked — no full text of the source

Classified as probably not a substantial claim.

The experimental design followed a full-factorial structure: 2 CO2 concentrations × 3 spirulina treatments × 2 regolith simulant types × 5 soil-to-regolith simulant ratios, plus controls, totaling 72 treatment groups.

“The experimental design followed a full-factorial structure: 2 CO 2 concentrations × 3 spirulina treatments × 2 regolith simulant types × 5 soil-to-regolith simulant ratios, plus controls, totaling 72 treatment groups (10 plants per group).”

May combine two claims.

For dicots, leaves emerge earlier and more abundantly, within a similar size range, under high CO2 conditions.

“This is particularly true for dicots, where it has been shown that leaves emerge earlier and more abundantly, within a similar size range, when grown in high CO 2 conditions (Morison and Lawlor, 1999).”

• cites Morison and Lawlor, 1999 sourceNot checked — no full text of the source

Classified as probably not a substantial claim. May combine two claims.

The growth chambers were maintained at distinct CO2 concentrations: ambient (400 ppm) and elevated (1,200 ppm), with elevated CO2 controlled within 1,100-1300 ppm.

“The growth chambers used in this study were maintained at distinct CO 2 concentrations: ambient (400 ppm) and elevated (1,200 ppm).A CO 2 control unit (Autopilot APC8200) was integrated to maintain elevated CO 2 levels with precision within a range of 1,100-1300 ppm in the elevated chamber”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims. The quote only partly states this claim.

High humidity (95%-100% RH) for 6 days starting day 33 represented an additional stressor and may have influenced plant color and health.

“The high levels of humidity represent an additional stressor for the plants and may have influenced plant color and health.”

Probably not a substantial claim: may not pass S3 (load-bearing).

The study was limited to short-cycle microgreens.

“The study was limited to short-cycle microgreens.”

May combine two claims.

Spirulina supplements deliver nutrients and bioactive compounds through aqueous extraction, making phytohormones, antioxidants, and enzymes available to plants, improving root growth, stress tolerance, and nutrient uptake.

“Furthermore, spirulina supplements deliver nutrients and bioactive compounds through aqueous extraction, making phytohormones, antioxidants, and enzymes available to plants, improving root growth, stress tolerance, and nutrient uptake (Henard et al., 2021).”

• cites Henard et al., 2021 sourceNot checked — no full text of the source

The quote only partly states this claim.

A supplementary fan introduced on day 25 to improve air circulation after early yellowing introduces a potential confounding variable for late-stage leaf color and health metrics.

“While intended to stabilize airflow, this change introduces a potential confounding variable for late-stage leaf color and health metrics.”

Probably not a substantial claim: may not pass S3 (load-bearing).

This is a known and unavoidable limitation of the study due to the lack of Martian samples and the limited availability of lunar samples.

“This is a known and unavoidable limitation of the study due to the lack of Martian samples and the limited availability of lunar samples.”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

Crops with longer lifecycles may exhibit different responses.

“Crops with longer lifecycles may exhibit different responses.”

Probably not a substantial claim: may not pass S3 (load-bearing).

The use of sphagnum moss as a liner for the plant pods is a potential confound.

“The use of sphagnum moss as a liner for the plant pods is another potential confound.”

May combine two claims.

Elevated CO2 increases photosynthetic activity and biomass accumulation by boosting the Calvin cycle's efficiency and reducing photorespiration.

“Elevated CO 2 increases photosynthetic activity and biomass accumulation by boosting the Calvin cycle's efficiency and reducing photorespiration (Zabel et al., 2022).”

• cites Zabel et al., 2022 sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

While CO2 was controlled, other atmospheric variables (e.g., ethylene accumulation) were not.

“While CO 2 was controlled, other atmospheric variables (e.g., ethylene accumulation) were not.”

May combine two claims.

Both interventions (fan and dehumidifier) were applied only to the high-CO2 chamber, not to the ambient CO2 chamber.

“Both interventions (fan and dehumidifier) were applied only to the high-CO 2 chamber, not to the ambient CO 2 chamber.”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

Early flowering and limited seed production reflect a typical stress response in plants, where they occur as a survival mechanism under severe stress.

“This reflects a typical stress response in plants, where early flowering and limited seed production occur as a survival mechanism under severe stress.”

• AssumptionRests on an assumption: Early flowering and limited seed production are a typical stress response in plants under severe stress.

Probably not a substantial claim: may not pass S3 (load-bearing).

Above a certain threshold, high amounts of CO2 are toxic to plants, impacting growth and health.

“Above a certain threshold, high amounts of CO 2 are toxic to plants, impacting both plant growth and overall health (CO 2 meter, 2023).”

• cites CO 2 meter, 2023Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

These results indicate that while vegetative growth was improved with spirulina supplementation, reproductive capacity remained constrained, consistent with challenges reported in space crop trials.

“These results indicate that while vegetative growth was improved with spirulina supplementation, reproductive capacity remained constrained, consistent with challenges reported in space crop trials.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Plants grown under elevated CO2 often exhibit increased root length and diameter, but are also associated with altered branching patterns in shoots and roots.

“Plants grown under elevated CO 2 concentrations often exhibit increased root length and diameter; however, they are also associated with altered branching patterns in both shoots and roots which may impair the plant's ability to compete for resources both below and above ground (Pritchard et al., 1999).”

• cites Pritchard et al., 1999 sourceNot checked — no full text of the source

Classified as probably not a substantial claim. May combine two claims.

The growth chamber was sealed to prevent light leaks and minimize gas exchange, with leakage measured at less than 5% of chamber volume per 24 h.

“The tent's construction is sealed to prevent light leaks and minimize gas exchange with the surrounding atmosphere, with leakage measured at <5% of chamber volume per 24 h.”

Classified as probably not a substantial claim.

Consistent use of sphagnum moss in all plant groups allows for the establishment of a baseline against which the relative effects of each variable may be compared.

“Importantly the consistent use of sphagnum moss in all plant groups allows for the establishment of a baseline against which the relative effects of each variable may be compared.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Trays were randomized within chambers and rotated frequently to mitigate position effects.

“Trays were randomized within chambers and rotated frequently to mitigate position effects.”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

This sample size provides sufficient statistical power consistent with standards in plant biology.

“This sample size provides sufficient statistical power consistent with standards in plant biology.”