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《Journal of Arid Land Resources and Environment》 2017-09
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Seed germination of Pyracantha fortuneana and the change of antioxidant enzyme activity under drought stress

JING Jin;WANG Fangzhen;ZHANG Yu;SHU Jianhong;Bayannaoer Environmental Protection Agency;Guizhou Institute of Prataculture;  
In this study,Pyracantha fortuneana was involved to study water-absorption regulation during seed germination process and the dynamic variations of several anti-oxidation enzymes activity including superoxide dismutase( SOD),peroxidase( POD),catalase( CAT),glutathione reductase( GR). The result showed the water absorption of seeds followed a " S-Curve" response to the extension of seed soaking time,with the maximum of 18. 14%,and seed germination experienced fast water absorbing phase at the initial 24 h,stable water absorbing phase in the following 24-220 h,and saturated water absorption phase from 220 h to 244 h. Drought stress significantly affected seed germination course,and resulted in decreased germination rate,prolonged mean germination time,delayed initial germination as the strengthen of drought stress. The activities of four antioxidant enzymes changed polynomial,showing a trend of decrease after increase,and then rising up again at the second inflexion. Maximum of SOD and POD activity were observed at bud period,and imbibition period for CAT and GR activity( though CAT activity was not significant between bud period and imbibition period). The activities of SOD,POD,CAT followed a trend of decrease after increase as the strengthen of drought stress,while that of GR was just the opposite. Our results indicated that P. fortuneana seed could adapt to drought in Karst by the regulation of seed germination course and the activities of antioxidant enzymes.
【Fund】: 贵州省体制改革项目(黔科合体Z字[2012]4005号)资助
【CateGory Index】: Q945.78
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