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Exogenous melatonin confers drought stress by promoting plant growth, photosynthetic capacity and antioxidant defense system of maize seedlings

文献类型： 外文期刊

作者： Ahmad, Shakeel 1 ; Kamran, Muhammad 1 ; Ding, Ruixia 1 ; Meng, Xiangping 1 ; Wang, Haiqi 1 ; Ahmad, Irshad 1 ; Fahad, 1 ;

作者机构： 1.Northwest A&F Univ, Key Lab Crop Physioecol & Tillage Northwestern Lo, Minist Agr, Coll Agron, Yangling, Shaanxi, Peoples R China

2.Northwest A&F Univ, Inst Water Saving Agr Arid Areas Chin, Key Lab Agr Soil & Water Engn Arid & Semiarid Are, Minist Educ, Yangling, Shaanxi, Peoples R China

3.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou, Guangdong, Peoples R China

4.Univ Swabi, Dept Agr, Swabi, Khyber Pakhtunk, Pakistan

关键词： Melatonin; Biomass; Chlorophyll; Antioxidants; Photosynthesis; Drought

期刊名称：PEERJ （ 影响因子：2.984； 五年影响因子：3.369 ）

ISSN： 2167-8359

年卷期： 2019 年 7 卷

页码：

收录情况： SCI

摘要： Melatonin is an important biologically active hormone that plays a vital role in plant growth and development. In particular, it has been investigated for its roles in abiotic stress management. The current experiment was carried out to investigate the protective role of melatonin in photosynthetic traits and the antioxidant defense system of maize seedling under drought stress. Maize seedlings were subjected to drought stress (40-45% FC) after two weeks of seedling emergence, followed by a foliar spray (0, 25, 50, 75 and 100 mu M) and soil drench of melatonin (0, 25, 50, 75 and 100 mu M). Our results indicated that drought stress negatively affected maize seedling and decreased plant growth and development, biomass accumulation, reduced chlorophyll, and carotenoid content, and significantly declined photosynthetic rate and stomatal conductance. On the other hand, reactive oxygen species, soluble protein, and proline content increased under drought stress. However, the application of exogenous melatonin reduced the reactive oxygen species burst and enhanced the photosynthetic activity by protecting from damages through activation of various antioxidant enzymes under drought stress. Foliar application of 100 mu M and soil drench of 50 mu M melatonin was the most effective treatment concentrations under drought stress. Our current findings hereby confirmed the mitigating potential of melatonin application for drought stress by maintaining plant growth, improving the photosynthetic characteristics and activities of antioxidants enzymes.

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