The Beneficial Roles of Elevated [CO2] on Exogenous ABA-Enhanced Drought Tolerance of Cucumber Seedlings

文献类型： 外文期刊

第一作者： Sun, Qiying

作者： Sun, Qiying;He, Xinrui;Wang, Tengqi;Qin, Hengshan;Yuan, Xin;Chen, Yunke;Bian, Zhonghua;Li, Qingming

作者机构： Shandong Agr Univ, Coll Hort Sci & Engn, Tai An 271018, Peoples R China;Chinese Acad Agr Sci, Inst Urban Agr, Natl Chengdu Agr Sci & Technol Ctr, Chengdu 610299, Peoples R China

关键词： drought stress; elevated CO2; ABA; antioxidant system; ASA-GSH

期刊名称：HORTICULTURAE （ 2022影响因子：3.1； 五年影响因子：3.4 ）

ISSN：

年卷期： 2023 年 9 卷 4 期

页码：

收录情况： SCI

摘要： Drought stress severely limits crop growth and yield. With the atmospheric CO2 constantly increasing, plants will be affected by multiple effects of drought and increased CO2 in the future. Abscisic acid (ABA) plays vital roles in plant stress tolerance, especially drought stress. However, little is known about the effects of elevated CO2 concentration (e[CO2]) and exogenous ABA in cucumber (Cucumis sativus L.) response to drought stress. In the present study, we investigated the effects of e[CO2] and exogenous ABA on the drought tolerance of cucumber seedlings under the simulated drought stress induced by 5% polyethylene glycol 6000. The experiment was a split-plot design, in which the main factor was CO2 concentrations; atmospheric and elevated CO2 concentrations (similar to 400 and 800 +/- 40 mu mol mol(-1), respectively). The subplot factor was the combinations of exogenous ABA and its synthesis inhibitor sodium tungstate (Na2WO4); deionized water (control), 20 mu M ABA, 2 mM Na2WO4, and 2 mM Na2WO4 + 20 mu M ABA, which were applied to plant leaves. The results showed that compared with exogenous ABA application only, e[CO2] combined with exogenous ABA significantly increased the biomass, chlorophyll content, and net photosynthetic rate (P-n) of cucumber seedlings under drought stress. Meanwhile, e[CO2] and exogenous ABA were more efficient in reducing the contents of reactive oxygen species and malondialdehyde, promoting the accumulation of proline, soluble sugar, soluble protein, free amino acid, ascorbic acid, and glutathione. The ratios of ascorbic acid/dehydroascorbic acid (ASA/DHA), glutathione/oxidized glutathione (GSH/GSSG), as well as the activities of antioxidant enzymes were increased. In conclusion, e[CO2] and exogenous ABA synergistically alleviated oxidative damage of drought stress on cucumber seedlings by increasing antioxidant enzyme activities and accelerating the ASA-GSH cycle in cucumber seedlings, which in turn improved the drought tolerance of cucumber seedlings, and provided theoretical and practical support for further studies on the alleviation of drought stress in protected horticulture.

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