Short-term salt stress reduces photosynthetic oscillations under triose phosphate utilization limitation in tomato

文献类型： 外文期刊

第一作者： Zhang, Yuqi

作者： Zhang, Yuqi;Li, Tao;Kaiser, Elias;Marcelis, Leo F. M.;Dutta, Satadal;Sharkey, Thomas D.;Sharkey, Thomas D.;Sharkey, Thomas D.

作者机构：

关键词： Dynamic light; gas exchange; salt stress; tomato; TPU limitation; triose phosphate utilization

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.9； 五年影响因子：8.0 ）

ISSN： 0022-0957

年卷期： 2024 年 75 卷 10 期

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收录情况： SCI

摘要： Triose phosphate utilization (TPU) limitation is one of the three biochemical limitations of photosynthetic CO2 assimilation rate in C3 plants. Under TPU limitation, abrupt and large transitions in light intensity cause damped oscillations in photosynthesis. When plants are salt-stressed, photosynthesis is often down-regulated particularly under dynamic light intensity, but how salt stress affects TPU-related dynamic photosynthesis is still unknown. To elucidate this, tomato (Solanum lycopersicum) was grown with and without sodium chloride (NaCl, 100 mM) stress for 13 d. Under high CO2 partial pressure, rapid increases in light intensity caused profound photosynthetic oscillations. Salt stress reduced photosynthetic oscillations in leaves initially under both low- and high-light conditions and reduced the duration of oscillations by about 2 min. Besides, salt stress increased the threshold for CO2 partial pressure at which oscillations occurred. Salt stress increased TPU capacity without affecting Rubisco carboxylation and electron transport capacity, indicating the up-regulation of end-product synthesis capacity in photosynthesis. Thus salt stress may reduce photosynthetic oscillations by decreasing leaf internal CO2 partial pressure and/or increasing TPU capacity. Our results provide new insights into how salt stress modulates dynamic photosynthesis as controlled by CO2 availability and end-product synthesis. Short-term salt stress decreased the settling time of light-triggered photosynthetic oscillations that occur when reaching triose phosphate limitation, and increased the threshold for [CO2 ] at which oscillations were observed.

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