The Alleviation of Photosynthetic Damage in Tomato under Drought and Cold Stress by High CO(2)and Melatonin

文献类型： 外文期刊

第一作者： Zhou, Rong

作者： Zhou, Rong;Ottosen, Carl-Otto;Wan, Hongjian;Jiang, Fangling;Yu, Xiaqing;Li, Xiangnan;Rosenqvist, Eva

作者机构：

关键词： tomato; elevated CO(2)concentration; melatonin; drought stress; cold stress; recovery

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN：

年卷期： 2020 年 21 卷 15 期

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收录情况： SCI

摘要： The atmospheric CO(2)concentration (a[CO2]) is increasing at an unprecedented pace. Exogenous melatonin plays positive roles in the response of plants to abiotic stresses, including drought and cold. The effect of elevated CO(2)concentration (e[CO2]) accompanied by exogenous melatonin on plants under drought and coldstressesremains unknown. Here, tomato plants were grown under a[CO2] and e[CO2], with half of the plants pre-treated with melatonin. The plants were subsequently treated with drought stress followed by cold stress. The results showed that a decreased net photosynthetic rate (P-N) was aggravated by a prolonged water deficit. The P(N)was partially restored after recovery from drought but stayed low under a successive cold stress. Starch content was downregulated by drought but upregulated by cold. The e[CO2] enhanced P(N)of the plants under non-stressed conditions, and moderate drought and recovery but not severe drought. Stomatal conductance (g(s)) and the transpiration rate (E) was less inhibited by drought under e[CO2] than under a[CO2]. Tomato grown under e[CO2] had better leaf cooling than under a[CO2] when subjected to drought. Moreover, melatonin enhanced P(N)during recovery from drought and cold stress, and enhanced biomass accumulation in tomato under e[CO2]. The chlorophyllacontent in plants treated with melatonin was higher than in non-treated plants under e[CO2] during cold stress. Our findings will improve the knowledge on plant responses to abiotic stresses in a future [CO2]-rich environment accompanied by exogenous melatonin.

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