NaCl affects photosynthetic and stomatal dynamics by osmotic effects and reduces photosynthetic capacity by ionic effects in tomato
NaCl affects photosynthetic and stomatal dynamics by osmotic effects and reduces photosynthetic capacity by ionic effects in tomato
复制标题
氯化钠通过渗透效应影响光合作用和气孔动力学，并通过离子效应降低番茄的光合作用能力
DOI：
10.1093/jxb/erac078
复制
发表时间：
2022
影响因子：
6.9
通讯作者：
Leo F.M. Marcelis
中科院分区：
文献类型：
--
作者：
Yuqi Zhang;Elias Kaiser;Tao Li;Leo F.M. Marcelis
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, CO2carboxylation 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.
