Biochemical versus stomatal acclimation of dynamic photosynthetic gas exchange to elevated CO2 in three horticultural species with contrasting stomatal morphology

文献类型： 外文期刊

第一作者： Zhang, Ningyi

作者： Zhang, Ningyi;Zhang, Ningyi;Berman, Sarah R.;van den Berg, Tom;Chen, Yunke;Marcelis, Leo F. M.;Kaiser, Elias;van den Berg, Tom;Chen, Yunke

作者机构：

关键词： acclimation; dynamic stomatal response; elevated CO2; photosynthetic induction; post-illumination phase; steady-state photosynthesis

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：6.0； 五年影响因子：7.6 ）

ISSN： 0140-7791

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Understanding photosynthetic acclimation to elevated CO2 (eCO(2)) is important for predicting plant physiology and optimizing management decisions under global climate change, but is underexplored in important horticultural crops. We grew three crops differing in stomatal density-namely chrysanthemum, tomato, and cucumber-at near-ambient CO2 (450 mu mol mol(-1)) and eCO(2) (900 mu mol mol(-1)) for 6 weeks. Steady-state and dynamic photosynthetic and stomatal conductance (g(s)) responses were quantified by gas exchange measurements. Opening and closure of individual stomata were imaged in situ, using a novel custom-made microscope. The three crop species acclimated to eCO(2) with very different strategies: Cucumber (with the highest stomatal density) acclimated to eCO(2) mostly via dynamic g(s) responses, whereas chrysanthemum (with the lowest stomatal density) acclimated to eCO(2) mostly via photosynthetic biochemistry. Tomato exhibited acclimation in both photosynthesis and g(s) kinetics. eCO(2) acclimation in individual stomatal pore movement increased rates of pore aperture changes in chrysanthemum, but such acclimation responses resulted in no changes in g(s) responses. Although eCO(2) acclimation occurred in all three crops, photosynthesis under fluctuating irradiance was hardly affected. Our study stresses the importance of quantifying eCO(2) acclimatory responses at different integration levels to understand photosynthetic performance under future eCO(2) environments.

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