Foliar application of melatonin delay leaf senescence in maize by improving the antioxidant defense system and enhancing photosynthetic capacity under semi-arid regions

被引：80

作者：

Ahmad, Shakeel ^{[1
,2
]}

Su, Wennan ^{[1
,2
]}

Kamran, Muhammad ^{[1
,2
]}

Ahmad, Irshad ^{[1
,2
]}

Meng, Xiangping ^{[1
,2
]}

Wu, Xiaorong ^{[1
,2
]}

Javed, Tehseen ^{[3
]}

Han, Qingfang ^{[1
,2
]}

机构：

[1] Northwest A&F Univ, Key Lab Crop Physioecol & Tillage Northwestern Lo, Minist Agr, Coll Agron, Yangling 712100, Shaanxi, Peoples R China

[2] Northwest A&F Univ, Key Lab Agr Soil & Water Engn Arid & Semiarid Are, Minist Educ, Inst Water Saving Agr Arid Areas China, Yangling 712100, Shaanxi, Peoples R China

[3] Northwest Agr & Forestry Univ, Coll Water Resources & Architectural Engn, Yangling, Shaanxi, Peoples R China

来源：

PROTOPLASMA | 2020年 / 257卷 / 04期

关键词：

Leaf senescence; Photosynthetic trait; Melatonin; Antioxidant enzymes; Maize yield; Semi-arid region; PLANT-GROWTH REGULATORS; SALT STRESS TOLERANCE; OXIDATIVE STRESS; CHLOROPHYLL BREAKDOWN; SUPEROXIDE-DISMUTASE; PROTECTIVE ROLE; YIELD; LEAVES; ENZYMES; PROTEIN;

D O I：

10.1007/s00709-020-01491-3

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Melatonin is an important plant growth regulator which plays a key role in plant growth and development. The objective of the current research was to evaluate the effect of foliar application of melatonin (MF) on photosynthetic efficiency, antioxidant defense mechanism, and its relation with leaf senescence in maize crop grown in a semi-arid region. A field experiment was conducted during 2017 and 2018 growth season, where melatonin was applied to the foliage at concentrations of 0 (MF0), 25 (MF1), 50 (MF2), and 75 (MF3) mu M at the ninth leaf stage. Foliar application of melatonin significantly improved chlorophyll content, net photosynthetic rate, soluble sugar content, and soluble protein content during the process of leaf senescence. The application of melatonin also enhanced antioxidant enzyme activities including superoxide dismutase, catalase, and peroxidase, while reduced malondialdehyde and reactive oxygen species accumulation. Melatonin foliar application also increased total leaf area per plant, grains per ear, thousand grain weight and grain yield of maize crop in a semi-arid region. The application of melatonin significantly improved photosynthetic activity, antioxidant defense mechanism, and yield of maize crop in a semi-arid region, where the most effective treatment was MF2.

引用

页码：1079 / 1092

页数：14

共 86 条

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