Increased stomatal conductance induces rapid changes to photosynthetic rate in response to naturally fluctuating light conditions in rice.
Increased stomatal conductance induces rapid changes to photosynthetic rate in response to naturally fluctuating light conditions in rice.
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DOI：
10.1111/pce.13725
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发表时间：
2020-01
期刊：
影响因子：
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通讯作者：
W. Yamori;K. Kusumi;K. Iba;I. Terashima
中科院分区：
文献类型：
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作者：
W. Yamori;K. Kusumi;K. Iba;I. Terashima
在不同的环境条件下，不同植物的气孔导度与稳态光合作用速率之间存在着密切的相关性。然而，在自然变化的光照条件下，气孔导度是否是光合作用速率的主要限制因素仍不清楚。我们分析了一个SLAC1基因敲除水稻品系，以研究气孔导度在光合作用对波动光反应中的作用。SLAC1编码调节气孔关闭的气孔阴离子通道。在强光处理前长期暴露在弱光下，增加了植物达到稳定光合作用速率所需的光合作用诱导时间，并通过限制CO2向叶片的扩散而导致光合作用的气孔限制。在光照增强后，slac1突变体的气孔张开率显著高于野生型植株，从而导致更高的光合作用诱导速率。在光照水平高度可变的自然条件下，slac1突变体的气孔保持开放，以确保有效的光合作用反应。这些观察结果表明，在自然光照波动的环境中，气孔导度对水稻光合作用的调节是重要的。这篇文章受版权保护。版权所有。
A close correlation between stomatal conductance and the steady-state photosynthetic rate has been observed for diverse plant species under various environmental conditions. However, it remains unclear whether stomatal conductance is a major limiting factor for the photosynthetic rate under naturally fluctuating light conditions. We analyzed a SLAC1 knockout rice line to examine the role of stomatal conductance in photosynthetic responses to fluctuating light. SLAC1 encodes a stomatal anion channel that regulates stomatal closure. Long exposures to weak light before treatments with strong light increased the photosynthetic induction time required for plants to reach a steady-state photosynthetic rate and also induced stomatal limitation of photosynthesis by restricting the diffusion of CO2 into leaves. The slac1 mutant exhibited a significantly higher rate of stomatal opening after an increase in irradiance than wild-type plants, leading to a higher rate of photosynthetic induction. Under natural conditions, in which irradiance levels are highly variable, the stomata of the slac1 mutant remained open to ensure efficient photosynthetic reaction. These observations reveal that stomatal conductance is important for regulating photosynthesis in rice plants in the natural environment with fluctuating light. This article is protected by copyright. All rights reserved.