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  • Title: Effects of exogenous Ca2+ on stomatal traits, photosynthesis, and biomass of maize seedings under salt stress.
    Author: Zhang H, Zheng YP, Ye J, Gao W, Qiao YJ, Dai CJ, Zhao YX, Shi SJ.
    Journal: Ying Yong Sheng Tai Xue Bao; 2019 Mar; 30(3):923-930. PubMed ID: 30912385.
    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 (Pn) initially increased and then decreased with the increases of exogenous Ca2+ concentration, whereas both the stomatal conductance (gs) and intercellular CO2 concentration (Ci) were decreased, suggesting that the decrease of Pn 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. 探讨盐胁迫下玉米气孔特征、光合作用和生物量对外源钙离子的响应,有助于深入理解添加外源钙离子(Ca2+)缓解玉米盐胁迫的作用机理.以‘京科665’品种为试材,研究了NaCl胁迫下(100 mmol·L-1)添加不同浓度外源Ca2+(0、5、10、20、40、80 mmol·L-1)对玉米幼苗气孔特征、光合作用和生物量的影响.结果表明: 不同Ca2+浓度对盐胁迫下玉米的气孔密度影响不大,但显著减小了气孔形状指数、气孔面积、气孔长度、气孔宽度和气孔周长.同时,随着外源Ca2+浓度的逐渐提高,玉米叶片的净光合速率(Pn)呈先升高后降低的趋势,且气孔导度(gs)和胞间CO2浓度(Ci)均显著降低,表明不同浓度Ca2+通过改变玉米气孔结构特征进一步限制光合作用过程,最终导致Pn降低.另外,外源Ca2+促进盐胁迫下玉米幼苗生物量增加,但根冠比显著降低,表明盐胁迫下添加外源Ca2+对地上部分的缓解作用大于地下部分.
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