Speed of light-induced stomatal movement is not correlated to initial or final stomatal conductance in rice.

IF 2.1 4区生物学 Q2 PLANT SCIENCES

Photosynthetica Pub Date : 2022-05-17 eCollection Date: 2022-01-01 DOI:10.32615/ps.2022.013

Z Xiong, Q W Luo, D L Xiong, K H Cui, S B Peng, J L Huang

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Abstract

In nature, plants are often confronted with wide variations in light intensity, which may cause a massive carbon loss and water waste. Here, we investigated the response of photosynthetic rate and stomatal conductance to fluctuating light among ten rice genotypes and their influence on plant acclimation and intrinsic water-use efficiency (WUE_i). Significant differences were observed in photosynthetic induction and stomatal kinetics across rice genotypes. However, no significant correlation was observed between steady-state and non-steady-state gas exchange. Genotypes with a greater range of steady-state and faster response rate of the gas exchange showed stronger adaptability to fluctuating light. Higher stomatal conductance during the initial phase of induction had little effect on the photosynthetic rate but markedly decreased the plant WUE_i. Clarification of the mechanism influencing the dynamic gas exchange and synchronization between photosynthesis and stomatal conductance under fluctuating light may contribute to the improvement of photosynthesis and water-use efficiency in the future.

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在水稻中，光诱导气孔运动的速度与初始和最终气孔导度无关

C -细胞间co2浓度;C if -细胞间co2终浓度;G -气孔导度;G s,300 -诱导300 s时的气孔导度;gsf -终气孔导度;初始气孔导度;LB -瞬时生化限制;LS -瞬态气孔限制;P -最终光合速率;P i—初始光合速率;光合速率;g的p50 - g使初始值和最终值之差增加50%所需的时间;p90 (g) - g使初始值与最终值之差增加90%所需的时间;P N的P 50 - P N增加初值与终值之差的50%所需的时间;P N的P 90——P N增加初值与终值之差90%所需的时间;p300 -诱导300 s时的光合速率;R d—暗呼吸速率;W -最终内在水利用效率。初始固有水利用效率;WUE i——内在水利用效率;Γ * -无光呼吸时的co2补偿点。致谢:本工作得到国家自然科学基金(31671620)的支持。利益冲突:作者声明他们没有利益冲突。在自然界中，植物经常面临光强度的巨大变化，这可能导致大量的碳损失和水浪费。研究了10个水稻基因型光合速率和气孔导度对波动光的响应及其对植物驯化和内在水分利用效率(WUE i)的影响。不同水稻基因型在光合诱导和气孔动力学方面存在显著差异。然而，稳态和非稳态气体交换之间没有显著的相关性。稳态范围大、气体交换响应速率快的基因型对波动光的适应性强。诱导初期较高的气孔导度对光合速率影响不大，但显著降低植株水分利用效率。阐明波动光下影响光合作用和气孔导度动态气体交换和同步的机制，有助于未来提高光合作用和水分利用效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Photosynthetica 生物-植物科学

CiteScore

5.60

自引率

7.40%

发文量

审稿时长

3.8 months

期刊介绍： Photosynthetica publishes original scientific papers and brief communications, reviews on specialized topics, book reviews and announcements and reports covering wide range of photosynthesis research or research including photosynthetic parameters of both experimental and theoretical nature and dealing with physiology, biophysics, biochemistry, molecular biology on one side and leaf optics, stress physiology and ecology of photosynthesis on the other side. The language of journal is English (British or American). Papers should not be published or under consideration for publication elsewhere.