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Cited by 174Photosynthetic Processes and MechanismsPlant Water Relations and Carbon DynamicsPlant Stress Responses and Tolerance

Rubisco activity in Mediterranean species is regulated by the chloroplastic CO2 concentration under water stress.

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Galmes, J., Ribas-Carbo, M., Medrano, H., Flexas, J.·2011·Journal of Experimental Botany
DOI 10.1093/jxb/erq303PMC PMC3003812
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Abstract

Water stress decreases the availability of the gaseous substrate for ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) by decreasing leaf conductance to CO(2). In spite of limiting photosynthetic carbon assimilation, especially in those environments where drought is the predominant factor affecting plant growth and yield, the effects of water deprivation on the mechanisms that control Rubisco activity are unclear. In the present study, 11 Mediterranean species, representing different growth forms, were subject to increasing levels of drought stress, the most severe one followed by rewatering. The results confirmed species-specific patterns in the decrease in the initial activity and activation state of Rubisco as drought stress and leaf dehydration intensified. Nevertheless, all species followed roughly the same trend when Rubisco activity was related to stomatal conductance (g(s)) and chloroplastic CO(2) concentration (C(c)), suggesting that deactivation of Rubisco sites could be induced by low C(c), as a result of water stress. The threshold level of C(c) that triggered Rubisco deactivation was dependent on leaf characteristics and was related to the maximum attained for each species under non-stressing conditions. Those species adapted to low C(c) were more capable of maintaining active Rubisco as drought stress intensified.

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  • Rubisco in rice is more sensitive to de-activation than wheat Rubisco at low CO2 availability.

    “These results suggest that Rubisco in rice is more sensitive to de-activation than wheat Rubisco at low CO2 availability.”

    From Rubisco and Rubisco Activase Play an Important Role in the Biochemical Limitations of Photosynthesis in Rice, Wheat, and Maize under High Temperature and Water Deficit (2017) · cites this paper as Galmés et al., 2011

    The Results and discussion section (‘Causes for reduced Rubisco activity under water stress’; page unavailable) reports Rubisco deactivation at low CO2 and cites wheat among species in which it has been observed. It does not compare rice with wheat or say that rice Rubisco is more sensitive to deactivation. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

  • Down-regulation of photosynthesis depends more on the availability of CO2 in the chloroplast than on leaf water content or water potential.

    “Such a strong relationship led to the proposal that the down-regulation of photosynthesis depends more on the availability of CO 2 in the chloroplast than on leaf water content or water potential (Flexas et al. 2002, Saibo et al. 2009, Galmes et al. 2011).”

    From Photosynthesis under stressful environments: An overview (2013) · cites this paper as Galmes et al. 2011

    The Results and discussion (‘Causes for reduced Rubisco activity under water stress’; no page available) report that Rubisco activity correlated more strongly with chloroplastic CO2 concentration than with relative water content. The Concluding remarks likewise propose CO2 availability rather than leaf dehydration as the mediator of reduced Rubisco activity. These passages support the comparison for Rubisco activity, but do not establish it for the down-regulation of photosynthesis as a whole or make a direct comparison with leaf water potential. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

  • Low chloroplastic CO2 concentration occurring under water deficit could induce de-activation of Rubisco in some Mediterranean species.

    “More recently, Galmés et al. (2011) suggested that low chloroplastic CO2 concentration (Cc) occurring under WD could induce de-activation of Rubisco in some Mediterranean species.”

    From Rubisco and Rubisco Activase Play an Important Role in the Biochemical Limitations of Photosynthesis in Rice, Wheat, and Maize under High Temperature and Water Deficit (2017) · cites this paper as Galmés et al., 2011

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Authors
Galmes, J., Ribas-Carbo, M., Medrano, H., & Flexas, J.
Affiliations
Mediterranean Institute for Advanced Studies (ES)
ORCID
Venue
Journal of Experimental Botany
Publisher
Oxford University Press (OUP)
Published
2010-11-29
Volume
62
Issue
2
Pages
653-665
ISSN
  • 0022-0957 (ISSN-L)
  • 1460-2431
DOI
10.1093/jxb/erq303
PMC
PMC3003812
OpenAlex
W2130599388
Cited by
174
References
2
Citations by year
2026: 8 · 2025: 7 · 2024: 6 · 2023: 7 · 2022: 12 · 2021: 9 · 2020: 17 · 2019: 13 · 2018: 10 · 2017: 7 · 2016: 20 · 2015: 10 · 2014: 15 · 2013: 16 · 2012: 8
FWCI
4.30
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Journal of Experimental Botany (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Physical Sciences › Environmental Science › Global and Planetary Change › Plant Water Relations and Carbon Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Stress Responses and Tolerance
Keywords
Rubisco, drought stress, stomatal conductance, leaf dehydration, Mediterranean flora, rewatering, photosynthetic carbon assimilation, plant adaptation to drought
MeSH terms
Carbon Dioxide, Chloroplasts, Plant Proteins, Plants, Ribulose-Bisphosphate Carboxylase, Water, Gene Expression Regulation, Plant, Mediterranean Region, Droughts

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