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Guard cell endomembrane Ca2+-ATPases underpin a ‘carbon memory’ of photosynthetic assimilation that impacts on water-use efficiency
Nature Plants ( IF 15.8 ) Pub Date : 2021-07-29 , DOI: 10.1038/s41477-021-00966-2
Mareike Jezek 1 , Fernanda A L Silva-Alvim 1 , Adrian Hills 1 , Naomi Donald 1 , Maryam Rahmati Ishka 2 , Jessica Shadbolt 1 , Bingqing He 3 , Tracy Lawson 4 , Jeffrey F Harper 2 , Yizhou Wang 3 , Virgilio L Lew 5 , Michael R Blatt 1, 3
Affiliation  

Stomata of most plants close to preserve water when the demand for CO2 by photosynthesis is reduced. Stomatal responses are slow compared with photosynthesis, and this kinetic difference erodes assimilation and water-use efficiency under fluctuating light. Despite a deep knowledge of guard cells that regulate the stoma, efforts to enhance stomatal kinetics are limited by our understanding of its control by foliar CO2. Guided by mechanistic modelling that incorporates foliar CO2 diffusion and mesophyll photosynthesis, here we uncover a central role for endomembrane Ca2+ stores in guard cell responsiveness to fluctuating light and CO2. Modelling predicted and experiments demonstrated a delay in Ca2+ cycling that was enhanced by endomembrane Ca2+-ATPase mutants, altering stomatal conductance and reducing assimilation and water-use efficiency. Our findings illustrate the power of modelling to bridge the gap from the guard cell to whole-plant photosynthesis, and they demonstrate an unforeseen latency, or ‘carbon memory’, of guard cells that affects stomatal dynamics, photosynthesis and water-use efficiency.



中文翻译:

保卫细胞内膜 Ca2+-ATP 酶支持影响水分利用效率的光合同化的“碳记忆”

当光合作用对CO 2的需求减少时,大多数植物的气孔关闭以保存水分。与光合作用相比,气孔反应较慢,并且这种动力学差异会在波动光下侵蚀同化和水分利用效率。尽管对调节气孔的保卫细胞有深入的了解,但增强气孔动力学的努力受到我们对叶面 CO 2对其控制的理解的限制。在结合叶面 CO 2扩散和叶肉光合作用的机械模型的指导下,我们在此揭示了内膜 Ca 2+储存在保卫细胞对波动光和 CO 2的反应中的核心作用。建模预测和实验表明 Ca 延迟由内膜 Ca 2+ -ATPase 突变体增强的2+循环,改变气孔导度并降低同化和水分利用效率。我们的研究结果说明了建模能够弥合从保卫细胞到全植物光合作用的差距,并且他们证明了影响气孔动力学、光合作用和水分利用效率的保卫细胞的不可预见的潜伏期或“碳记忆”。

更新日期:2021-07-29
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