Chloroplast ATP synthase restricts photosynthesis under fluctuating light in tomato but not in maize

文献类型： 外文期刊

第一作者： Li, Yi-Yun

作者： Li, Yi-Yun;Wang, Xiao-Qian;Huang, Wei;Li, Yi-Yun;Yang, Ying-Jie

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关键词： Chloroplast ATP synthase; Diffusion conductance; Fluctuating light; Photosynthesis

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：5.7； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2024 年 216 卷

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收录情况： SCI

摘要： Photosynthesis in fluctuating light requires coordinated adjustments of diffusion conductance and biochemical capacity, but the role of chloroplast ATP synthase activity (g(H)(+)) in dynamic photosynthesis is not well understood. In this study, we measured gas exchange, chlorophyll fluorescence and electrochromic shift signals in fluctuating light for leaves of tomato (Solanum lycopersicum) and maize (Zea mays). During the transition from sun to shade, simultaneous increases in g(H)(+), effective quantum yield of PSII, and net CO2 assimilation rate (A(N)) occurred in tomato but uncoupled in maize, indicating that g(H) (+) limited A(N) during the sun-to-shade transition in tomato but not in maize. During the shade-to-sun transition, g(H) (+) increased simultaneously with stomatal conductance, mesophyll conductance and Rubisco carboxylation capacity in tomato, suggesting that g(H)(+) is an overlooked factor affecting light induction of A(N) in tomato. By comparison, g(H) (+) maintained at high levels in maize and its A(N) was mainly restricted by stomatal conductance. Our results reveal that the kinetics of g(H)(+) in fluctuating light differs between species, and chloroplast ATP synthase may be a potential target for improving dynamic photosynthesis in crops such as tomato.

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