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《Chinese Journal of Grassland》 2014-05
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The Physiological and Germination Responses of Cynodon dactylon Seeds to Simultaneous Submergence

QIN Hong-wen;LIU Zheng-xue;ZHONG Yan;LIU Rui;YU Jian;ZHENG Li-dan;Department of Life Science and Engineering,Chongqing Three Gorges College;  
To explore the physiological and germination responses of Cynodon dactylon to submergence,the seeds were submerged for 0,7,14,21,28 and 35days on laboratory simulation condition.Besides the effects of submergence duration on the seed moisture content,thousand seeds weight,and the content of MDA,soluble sugar and starch as well as the effects on final germination rate(FGR),germination index(GI),time to start germination(TSG),peak period of germination(PPG),germination duration(GD)were analyzed.The results showed that seed moisture content increased significantly(P0.05,the following is the same.)from 8.85%to 20.89% with the duration of submergence.Both thousand seeds weight and starch content decreased significantly from 0.2793 g and 525.14mg/g to 0.1757 g and223.39mg/g at 35 d,respectively.After the soluble sugar content increased to maximum(86.01mg/g)on the 14 th day,the content began to decrease,and the minimum(25.99mg/g)occurred at 35 d.There were no significant differences among the MDA contents of treatment groups.As submergence extended,seed relative germination rate(RGR)and relative germination index(RGI)were decreased,time to start germination(TSG)and peak period of germination(PPG)were delayed,and seeds lost germination ability on the 28 th day.Submergence resulted in excessive consumption of substances stored in Cynodon dactylon seeds,but did not cause membrane lipid peroxidation.And 7days of submergence is threshold of seed germination ability.
【Fund】: 国家自然科学基金面上项目(31270451);; 国务院三峡工程建设委员会项目(SX〔2008〕-005);; 重庆市教委科学技术研究项目(KJ131103);; 三峡库区水环境演变与污染防治重点实验室开放基金(WETKL2012MS-07);; 重庆三峡学院青年项目(12QN15)
【CateGory Index】: Q945;S543.9
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