Auxin Dynamics after Decapitation Are Not Correlated with the Initial Growth of Axillary Buds
Open accessAbstract
One of the first and most enduring roles identified for the plant hormone auxin is the mediation of apical dominance. Many reports have claimed that reduced stem indole-3-acetic acid (IAA) levels and/or reduced basipetal IAA transport directly or indirectly initiate bud growth in decapitated plants. We have tested whether auxin inhibits the initial stage of bud release, or subsequent stages, in garden pea (Pisum sativum) by providing a rigorous examination of the dynamics of auxin level, auxin transport, and axillary bud growth. We demonstrate that after decapitation, initial bud growth occurs prior to changes in IAA level or transport in surrounding stem tissue and is not prevented by an acropetal supply of exogenous auxin. We also show that auxin transport inhibitors cause a similar auxin depletion as decapitation, but do not stimulate bud growth within our experimental time-frame. These results indicate that decapitation may trigger initial bud growth via an auxin-independent mechanism. We propose that auxin operates after this initial stage, mediating apical dominance via autoregulation of buds that are already in transition toward sustained growth.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Normal auxin transport may only be required for ongoing bud growth rather than being the initial trigger of bud release.
“Apart from other possible side effects of NPA, these data suggest that normal auxin transport may only be required for ongoing bud growth rather than being the initial trigger of bud release (Fig. 6; Morris et al., 2005;Dun et al., 2006) and that strigolactone and NPA act quite differently.”
From Strigolactone Acts Downstream of Auxin to Regulate Bud Outgrowth in Pea and Arabidopsis (2009) · cites this paper as Morris et al., 2005
The Discussion reports that initial axillary bud growth in pea is not correlated with auxin depletion and places auxin’s role at a later, sustained-growth stage. It does not establish that normal auxin transport is required for ongoing bud growth; rather, it says a lack of auxin allows sustained outgrowth after decapitation. (LLM, conf=0.82)
Experimental — accuracy not yet measuredIAA applied to the shoot apex of intact pea and Arabidopsis plants moved down the stem or inflorescence at the speed of polar auxin transport, approximately 1 cm h−1.
“As shown previously for pea, this treatment led to a wave of IAA that moved down the stem at the speed of polar auxin transport (1 cm h 21 ; Fig. 4, A-E; Morris et al., 2005;Ferguson and Beveridge, 2009).”
From Strigolactone Acts Downstream of Auxin to Regulate Bud Outgrowth in Pea and Arabidopsis (2009) · cites this paper as Morris et al., 2005
In decapitated pea plants, buds start to grow out before auxin concentrations in the associated nodal stem are diminished due to removal of the apical auxin source.
“In decapitated pea plants, buds start to grow out before auxin concentrations in the associated nodal stem are diminished due to removal of the apical auxin source (Morris et al., 2005).”
From Shaping plant architecture (2015) · cites this paper as Morris et al., 2005
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
The citation lists haven’t been fetched yet
References 44 · Cited by 135
Research works printed but not linked: 1
- Jones SE, Demeo JS, Davies NW, Noonan SE, Ross JJ (2005) Stems of the Arabidopsis pin1-1 mutant are not deficient in free indole-3-acetic acid. Planta (in press)
- Authors
- Morris, S. E., Cox, M. C. H., Ross, J. J., Krisantini, S., & Beveridge, C. A.
- Affiliations
- University of Tasmania (AU)
- Venue
- Plant Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 2005-06-17
- Volume
- 138
- Issue
- 3
- Pages
- 1665-1672
- ISSN
- 0032-0889 (ISSN-L)
- 1532-2548
- PMC
- PMC1176436
- OpenAlex
- W2102986073
- Cited by
- 135
- References
- 44
- Citations by year
- 2025: 2 · 2024: 4 · 2023: 8 · 2022: 4 · 2021: 17 · 2020: 9 · 2019: 6 · 2018: 8 · 2017: 7 · 2016: 5 · 2015: 13 · 2014: 7 · 2013: 2 · 2012: 8
- FWCI
- 4.81
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)
- Locations
- PLANT PHYSIOLOGY (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- eCite Digital Repository (University of Tasmania) (submittedVersion)
- Figshare (submittedVersion, cc-by)
- Funders
- United States Agency for International Development
- Australian Agency for International Development
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Parasitism and Resistance
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Flowering Plant Growth and Cultivation
- Keywords
- auxin, apical dominance, decapitation, axillary bud outgrowth, indole-3-acetic acid, auxin transport, auxin transport inhibitors, Pisum sativum
- MeSH terms
- Indoleacetic Acids, Kinetics, Pisum sativum, Plant Stems, Flowers, Seedlings
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
