首页|期刊导航|中国农业科学（英文版）|Grain Sink Strength Related to Carbon Staying in the Leaves of Hybrid Wheat XN901
中国农业科学（英文版）2009，Vol.8Issue(5)：546-555,10.
Grain Sink Strength Related to Carbon Staying in the Leaves of Hybrid Wheat XN901
Grain Sink Strength Related to Carbon Staying in the Leaves of Hybrid Wheat XN901
摘要
Abstract
XN901 is a K-type three-line hybrid wheat with a high yield potential,and its leaves and stem remaining green during grain maturation,suggesting much assimilate stay in leaves and stem.The grain water content,grain volume,carbohydrate content,and enzyme activity of sucose metabolism in the grain,as well as source-sink relationship were studied in order to investigate the physiological reason of the assimilate remaining in leaves and stem at the late stage.The results showed that the hybrid grains had more water and soluble sugar,higher activities of acid invertase and sucrose synthase at the early stage that led to a faster expansion growth,greater grain volume and faster starch synthesis at the early to mid stage of grain development.Also it had a longer period for actively filling.As a result,the grain weight and yield of the hybrid were increased by 14 and 15% respectively compared to that of Shaan 229.Additionally,the biomass of XN901 was 41.7% more than that of control,but its harvest index was 9% lower than Shaan 229.However,its lower activity of sucrose synthase indicated a lower sink activity at the late stage,resulting in a slow rate of filling and starch synthesis.Also,the hybrid wheat XN901 had a large source-sink ratio.It is the main reason for much assimilate remaining in the straw at the late stage and lower harvest index.Strengthening the sink activity and raising the harvest index should be the key means of improving the yield of hybrid wheat.关键词
hybrid wheat/stay-green/sink strength/sink activity/sink sizeKey words
hybrid wheat/stay-green/sink strength/sink activity/sink size分类
农业科技引用本文复制引用
GONG Yue-hua,JI Xiao-hui,GAO Jun-feng..Grain Sink Strength Related to Carbon Staying in the Leaves of Hybrid Wheat XN901[J].中国农业科学（英文版）,2009,8(5):546-555,10.基金项目
The research receives the grant-aided support from the National Natural Science Foundation of China (39670436),Young Scientists' Fund of National Natural Science Foundation of China (30600075) and Young Scientific Cadremen's Fund of Northwest A&F University,China.The anthors thank Prof.Li Shengxiu for English writing of this paper. （39670436）
