NaCl affects photosynthetic and stomatal dynamics by osmotic effects and reduces photosynthetic capacity by ionic effects in tomato

文献类型： 外文期刊

第一作者： Zhang, Yuqi

作者： Zhang, Yuqi;Li, Tao;Zhang, Yuqi;Kaiser, Elias;Marcelis, Leo F. M.

作者机构：

关键词： Fluctuating light; ionic stress; osmotic stress; photosynthesis; salt stress; stomatal conductance; tomato

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：7.298； 五年影响因子：8.291 ）

ISSN： 0022-0957

年卷期： 2022 年 73 卷 11 期

页码：

收录情况： SCI

摘要： Osmotic effects of NaCl induced stomatal closure and rapid stomatal kinetics, which affected photosynthetic induction rate. Photosynthetic capacity decreased during leaf development, and ionic effects of NaCl accelerated this process. NaCl stress affects stomatal behavior and photosynthesis by a combination of osmotic and ionic components, but it is unknown how these components affect stomatal and photosynthetic dynamics. Tomato (Solanum lycopersicum) plants were grown in a reference nutrient solution [control; electrical conductivity (EC)=2.3 dS m(-1)], a solution containing additional macronutrients (osmotic effect; EC=12.6 dS m(-1)), or a solution with additional 100 mM NaCl (osmotic and ionic effects; EC=12.8 dS m(-1)). Steady-state and dynamic photosynthesis, and leaf biochemistry, were characterized throughout leaf development. The osmotic effect decreased steady-state stomatal conductance while speeding up stomatal responses to light intensity shifts. After 19 d of treatment, photosynthetic induction was reduced by the osmotic effect, which was attributable to lower initial stomatal conductance due to faster stomatal closing under low light. Ionic effects of NaCl were barely observed in dynamic stomatal and photosynthetic behavior, but led to a reduction in leaf photosynthetic capacity, CO2 carboxylation rate, and stomatal conductance in old leaves after 26 d of treatment. With increasing leaf age, rates of light-triggered stomatal movement and photosynthetic induction decreased across treatments. We conclude that NaCl impacts dynamic stomatal and photosynthetic kinetics by osmotic effects and reduces photosynthetic capacity by ionic effects.

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