Exogenous 2-(3,4-Dichlorophenoxy) triethylamine alleviates salinity stress in maize by enhancing photosynthetic capacity, improving water status and maintaining K+/Na(+)homeostasis

文献类型： 外文期刊

第一作者： Li, Lijie

作者： Li, Lijie;Gu, Wanrong;Wang, Zhenhua;Zuo, Shiyu;Wei, Shi;Li, Lijie;Zhang, Liguo;Chen, Xichang;Qian, Chunrong;Li, Wenhua;Li, Congfeng

作者机构：

关键词： DCPTA; Salinity stress; Photosynthesis; Water status; Ion homeostasis

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2020 年 20 卷 1 期

页码：

收录情况： SCI

摘要： Background Soil salinity restricts plant growth and productivity. 2-(3,4-dichlorophenoxy) triethylamine (DCPTA) can alleviate salinity stress in plants. However, the mechanism of DCPTA-mediated salinity tolerance has not been fully clarified. We aimed to investigate its role in enhancing photosynthetic capacity, improving water status, maintaining K+/Na(+)homeostasis and alleviating salinity stress in maize (Zea maysL.). Results In present study, maize seedlings were grown in nutrient solutions with a combination of NaCl (0, 150 mM) and DCPTA (0, 20, 100, and 400 mu M). And photosynthesis, water status, ion homeostasis and the expression of genes involved in ion uptake and transport were evaluated in the maize seedlings. The results demonstrated that DCPTA alleviated the growth inhibition of maize seedlings exposed to salinity stress by increasing the net photosynthetic rate (P-n) and the quantum efficiency of photosystem II (PSII) photochemistry. DCPTA improved the root hydraulic conductivity, which help maintained the water status. A relatively high K(+)concentration but a relatively low Na(+)concentration and the Na+/K(+)ratio were observed in the presence of DCPTA under salinity stress. Additionally, DCPTA altered the expression of four genes (ZmSOS1,ZmHKT1,ZmNHX1andZmSKOR) that encode membrane transport proteins responsible for K+/Na(+)homeostasis. Conclusions DCPTA improved the salinity tolerance of maize may be associated with enhanced photosynthetic capacity, maintenance of water status and altered expression of genes involved in ion uptake and transport.

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