Exogenously applied spermidine alleviates photosynthetic inhibition under drought stress in maize (Zea mays L.) seedlings associated with changes in endogenous polyamines and phytohormones

文献类型： 外文期刊

第一作者： Li, Lijie

作者： Li, Lijie;Gu, Wanrong;Li, Jing;Xie, Tenglong;Qu, Danyang;Li, Caifeng;Wei, Shi;Li, Congfeng;Meng, Yao;Wei, Shi

作者机构：

关键词： Drought stress; Endogenous polyamines; Endogenous phytohormones; Maize (Zea mays L.); Photosynthetic characteristics; Spermidine

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

ISSN： 0981-9428

年卷期： 2018 年 129 卷

页码：

收录情况： SCI

摘要： Drought stress (DS) is a major environmental factor limiting plant growth and crop productivity worldwide. It has been established that exogenous spermidine (Spd) stimulates plant tolerance to DS. The effects of exogenous Spd on plant growth, photosynthetic performance, and chloroplast ultrastructure as well as changes in endogenous polyamines (PM) and phytohormones were investigate in DS-resistant (Xianyu 335) and DS-sensitive (Fenghe 1) maize seedlings under well-watered and DS treatments. Exogenous Spd alleviated the stress-induced reduction in growth, photosynthetic pigment content, photosynthesis rate (P-n) and photochemical quenching (q(p)) parameters, including the maximum photochemistry efficiency of photosystem II (PSII) (F-v/F-m), PSII operating efficiency (Phi PSII), and qP coefficient. Exogenous Spd further enhanced stress-induced elevation in non photochemical quenching (NPQ) and the de-epoxidation state of the xanthophyll cycle (DEPS). Microscopic analysis revealed that seedlings displayed a more ordered arrangement of chloroplast ultrastructure upon Spd application during DS. Exogenous Spd increased the endogenous PA concentrations in the stressed plants. Additionally, exogenous Spd increased indoleacetic acid (IAA), zeatin riboside (ZR) and gibberellin A(3) (GA(3)) and decreased salicylic acid (SA) and jasmonate (JA) concentrations under DS. These results indicate that exogenous Spd can alleviate the growth inhibition and damage to the structure and function of the photosynthetic apparatus caused by DS and that this alleviation may be associated with changes in endogenous PM and phytohormones. This study contributes to advances in the knowledge of Spd-induced drought tolerance.

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