Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Jiangsu Journal of Agricultural Sciences》 2010-04
Add to Favorite Get Latest Update

Effects of High Temperature on Key Enzyme Activities Related to Nitrogen Metabolism and Protein Content of Early-indica Rice Grain

XIAO Hui-hai,WANG Wen-long,HAO Xiao-hua(College of Life Science,Hunan University of Arts and Science,Changde 415000,China)  
In order to investigate the effect of high temperature on key enzyme activities related to nitrogen metabolism and protein content of early-indica rice grain,two rice varieties were used in pot experiments including Zhuliangyou 611(for fodder) and Xiangzaoxian 24(edible),treated with two temperature treatments(high as day 34 ℃/dark 29 ℃,appropriate as day 25 ℃/dark 22 ℃) in phytotrone,and the following indexes were analyzed,such as soluble protein content,glutamine synthetase(GS) and glutamate synthetase(GOGAT) activities related to nitrogen metabolism of rice grain after flowering.Under the high temperature condition,the grain weights of the two varieties both increased quickly but continued only a few days,and the soluble protein contents were higher than those under the appropriate condition.The activities of GS and GOGAT in grains were improved immediately at 7-10 d after flowering and reached the peaks at 10 d,then decreased.Under the appropriate temperature condition,the grain weights increased slowly and kept higher than those under the high temperature condition,and the activities of GS and GOGAT dropped slowly in grain after flowering.The effect of high temperature on the grain soluble protein content differed with early-indica rice genotypes.At 25 d after flowering,the grain soluble protein contents in Xiangzaoxian 24 and Zhuliangyou 611 under the high temperature condition were 4.45 mg/g and 2.23 mg/g(dry grain weight) more than those under the appropriate temperature condition.The results suggested that the high temperature at grain filling stage could improve the key enzyme activities related to nitrogen metabolism and soluble protein content of early-indica rice grain,especially for fodder rice.Therefore,in order to get high quality,the suitable seeding time should be selected for grain filling under higher temperature condition in early-indica rice cultivation.
【Fund】: 湖南省自然科学基金资助项目(07JJ6032);; 湖南省科技厅科技计划资助项目(2008FJ3066)
【CateGory Index】: S511.210.1
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved