Effects of submergence on the antioxidative enzymes and carbohydrate contents of Paspalum distichum

Abstract

Abstract: Submergence is one of the major abiotic stresses, primarily through restriction in the diffusion of oxygen and carbon dioxide in plants. A complex anti-oxidative defensive system plays an important role in defending anoxia or hypoxia stress. In this study, the physiological responses in antioxidative enzymes and carbohydrate contents of Paspalum distichum to different submergence times were investigated. 1) The activities of catalase (CAT), superoxide dismutase (SOD), peroxidase (POD), ascorbate peroxidase (APX), and glutathione reductase (GR) in roots increased with increased submergence duration and depth, implying an integrated pathway involving CAT, SOD, POD, GR, and APX for protection against the detrimental effects of activated oxygen species under submergence. 2) Total soluble carbohydrate and starch contents of shoots and roots decreased with increased submergence depth and duration, and the decrease was progressive and proportional to the magnitude of the submergence stress. The soluble carbohydrate of submerged plants necessary for survival can be replenished from starch hydrolyzation and this was critical for the survival of submerged P. distichum.

CLC Number:

TAN Shu-duan, ZHU Ming-yong, ZHANG Ke-rong, ZHU Jia-wen, WEI Gao-xia, ZHANG Quan-fa. Effects of submergence on the antioxidative enzymes and carbohydrate contents of Paspalum distichum[J]. Acta Prataculturae Sinica, 2013, 22(1): 217-224.

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