Effects of exogenous calcium on mesophyll cell ultrastructure, gas exchange, and photosystem II in tobacco (Nicotiana tabacum Linn.) under drought stress
文献类型： 外文期刊
第一作者： Hu, W.
作者： Hu, W.;Tian, S. B.;Di, Q.;Duan, S. H.;Dai, K.
作者机构：
关键词： abiotic stress; chlorophyll a fluorescence; electron transport rate; foliar fertilizer
期刊名称：PHOTOSYNTHETICA （ 影响因子：2.1； 五年影响因子：2.9 ）
ISSN： 0300-3604
年卷期： 2018 年 56 卷 4 期
页码：
收录情况： SCI
摘要： The effects of calcium chloride solution (10 mmol L-1) on mesophyll cell ultrastructure, gas exchange, chlorophyll and carotenoid content, and PSII in tobacco leaf were studied by simulating water deficit conditions via treatment with 25% PEG-6000 for 24 h. The results showed that under drought stress, the mesophyll cell structure and morphology were destroyed, photosynthesis and gas-exchange processes changed, photosynthetic pigment content decreased, and the electron transfer efficiency in PSII reduced. However, compared with the control treatment, under drought conditions, the addition of exogenous calcium could stabilize the structure and function of the chloroplasts, mitochondria, and endomembrane system in the mesophyll cells, maintain normal leaf net photosynthetic rate and gas exchange, alleviate the degree of photosynthetic pigment degradation, and increase the electron transfer energy in the leaves in PSII. As a means of ensuring normal photosynthesis under drought stress, we discovered that the application of exogenous calcium was more important for stabilization of the structure of the organelles, regulation of the osmotic balance, and increase of the photosynthetic pigment content, and proved to be less important for regulation of stomatal opening and closing.
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