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Xiang L.-X.,Northwest Agriculture and Forestry University | Xiang L.-X.,Key Laboratory of Protected Horticultural Engineering in Northwest | Xiang L.-X.,Shaanxi Province Facility Agriculture Engineering Center | Hu L.-P.,Northwest Agriculture and Forestry University | And 11 more authors.
Chinese Journal of Applied Ecology | Year: 2015

The regulatory effect of exogenous γ-aminobutyric acid (GABA) on metabolism of reactive oxygen species (ROS) in melon chloroplasts under short-term salinity-alkalinity stress were investigated in melon variety 'Jinhui No.1', which was cultured with deep flow hydroponics. The result showed that under salinity-alkalinity stress, the photosynthetic pigment content, MDA content, superoxide anion (O2 -) production rate and hydrogen peroxide (H2O2) content in chloroplast increased significantly, the contents of antioxidants ascorbic acid (AsA) and glutathione (GSH) increased, and the activities of H+-ATPase and H+-PPiase were inhibited obviously. With exogenous GABA application, the accumulations of O2 -, MDA and H2O2 induced by salinity-alkalinity stress were inhibited. Exogenous GABA alleviated the increase of photosynthetic pigment content, improved the activity of SOD, enzymes of AsA-GSH cycle, total AsA and total GSH while decreased the AsA/DHA ratio and GSH/GSSH ratio. Foliar GABA could enhance the H+-ATPase and H+-PPiase activities. Our results suggested that the exogenous GABA could accelerate the ROS metabolism in chloroplast, promote the recycle of AsA-GSH, and maintain the permeability of cell membrane to improve the ability of melon chloroplast against salinity-alkalinity stress. © 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved.

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