Effects of exogenous Ca2+ on stomatal traits, photosynthesis, and biomass of maize seedings under salt stress

doi:10.13287/j.1001-9332.201903.020

Abstract

Abstract: Understanding the responses of stomatal structure, photosynthesis and biomass of maize to exogenous Ca²⁺ addition under NaCl stress has important significance for further uncovering the alleviative mechanism of exogenous Ca²⁺on maize under salt stress. We examined the effects of exogenous Ca²⁺(0, 5, 10, 20, 40, 80 mmol·L^-1) on the stomatal structure, photosynthesis and biomass of maize (Zea mays L. cv. Jingke 665) seedlings under NaCl stress (100 mmol·L^-1). Our results showed that exogenous Ca²⁺ addition had limited effect on stomatal density, but significantly decreased stomatal shape index, stomatal area, stomatal length, stomatal width, and stomatal cir-cumference. Meanwhile, the net photosynthetic rate (P_n) initially increased and then decreased with the increases of exogenous Ca²⁺ concentration, whereas both the stomatal conductance (g_s) and intercellular CO₂ concentration (C_i) were decreased, suggesting that the decrease of P_n was mainly due to stomatal limitation under high Ca²⁺ concentration. The biomass of maize seedlings was increased and the root/shoot ratio was decreased with the increases of exogenous Ca²⁺ concentration, suggested that the alleviated effect of exogenous Ca²⁺ on aboveground biomass was higher than that on belowground biomass of maize under salt stress.

Key words: stomatal conductance, biomass, salt stress, exogenous Ca²⁺, photosynthesis

ZHANG Hao, ZHENG Yun-pu, YE Jia, GAO Wei, QIAO Ya-jun, DAI Chuan-jing, ZHAO Yu-xin, SHI Shao-jie. Effects of exogenous Ca²⁺ on stomatal traits, photosynthesis, and biomass of maize seedings under salt stress[J]. Chinese Journal of Applied Ecology, 2019, 30(3): 923-930.

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Effects of exogenous Ca²⁺ on stomatal traits, photosynthesis, and biomass of maize seedings under salt stress

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