Effects of Exogenous γ-Aminobutyric Acid (GABA) on Photosynthesis and Antioxidant System in Pepper (Capsicum annuum L.) Seedlings Under Low Light Stress

被引：0
作者：
Yuefei Li
Yong Fan
Ying Ma
Zhen Zhang
Haobo Yue
Lijie Wang
Jing Li
Yang Jiao
机构：
[1] Jinzhou Medical University,Liaoning Engineering Research Center of Meat Processing and Quality Safety Control, Department of Food Science and Engineering
[2] Liaoning Research Institute of Cash Crops,undefined
来源：
Journal of Plant Growth Regulation | 2017年 / 36卷
关键词：
Glutathione Reductase; Ethylene Diamine Tetraacetic Acid; Ethylene Diamine Tetraacetic Acid; Chilling Stress; Chlorophyll Fluorescence Parameter;
D O I：
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中图分类号：
学科分类号：
摘要：
The effects of γ-aminobutyric acid (GABA) treatment on parameters of photosynthesis and antioxidant defense system were measured in pepper (Capsicum annuum L.) leaves under low-light (LL) stress. Seedlings exposed to LL stress showed increased chlorophyll content as well as decreased net photosynthetic rate (Pn), stomatal conductance (gs), maximum quantum yield of PSII (Fv/Fm), actual PSII photochemical efficiency (ΦPSII), electron transport rates and photochemical quenching coefficient (qp). However, almost all the photosynthetic parameters above were enhanced markedly in seedlings treated with GABA under LL stress. Moreover, LL stress increased malondialdehyde (MDA) content, superoxide anion radical (O2·−) and hydrogen peroxide (H2O2) production. GABA-treated, LL-stressed seedlings exhibited lower MDA, O2·− and H2O2 production, and showed an activated antioxidant defense system, including increased activities of superoxide dismutase, catalase, ascorbate peroxidase, glutathione peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase, glutathione reductase, ascorbate and glutathione. Moreover, seedlings subjected to LL stress showed increased endogenous GABA levels, and the level was further improved by application of exogenous GABA. These results suggest that GABA mitigates the LL-induced stress via regulating the antioxidant defense system and maintaining a high level of photochemical efficiency in pepper seedlings.
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页码：436 / 449
页数：13
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