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The regulation of stomatal closure as a key factor to benefit from rising atmospheric [CO2] in rice (Oryza sativa L.)
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DOI：10.1016/j.jplph.2026.154787.png)
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Abstract
En 中文
Stomata, specialized pores on leaf epidermis, regulate CO2 uptake and water evaporation in terrestrial plants. Since environmental and biochemical stimuli affect stomatal aperture, its regulation is strongly correlated with photosynthesis. Particularly in rice (Oryza sativa L.), it was demonstrated that stomatal conductance (gs) is a major determinant of photosynthetic rate under well-watered conditions. However, little is known about the impact of altered stomatal regulation under CO2 enrichment on rice leaf physiology and metabolism. In this study, we analyse the physiological and proteomic response of SLAC1-deficient rice plants (slac1) with a constitutive open-stomata phenotype, grown under ambient or elevated CO2 concentration (a[CO2]: 400 vs e[CO2]: 700 μmol mol−1). According to gas-exchange measurements, gs and intracellular [CO2] were higher in slac1 than in the Wt genotype, while the photosynthetic rate was lower at both [CO2]. Although Wt plants were capable to double their biomass under e[CO2], any change was observed in the slac1 genotype. This behaviour linked to a higher transpiration rate under e[CO2], and a down-regulation of different aquaporins and photosynthetic light reaction proteins, together with the overexpression of proteins related to stress and redox homeostasis, revealed that their inability to close stomata subjected slac1 plants to stressful growing conditions that avoid the CO2 fertilization effect. In summary, the current study showed that, regulation of stomatal opening is a target process with potential double effect (positive or negative) that has an important impact on leaf metabolism and responsiveness to changing environmental conditions.
Keywords:
stomatal regulation
rice physiology
elevated CO2
photosynthesis
proteomic response
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