关键词: font-family:宋体, ">小麦；遮光；灌浆期；耐弱光性；产量；品种筛选

Abstract: In order to cope with continuous rain during the growth period of wheat in the middle and lower reaches of the Yangtze River,48 wheat varieties from Hubei,Anhui,Jiangsu,Henan and other regions were selected as test materials,the shading test was performed using a shading net at filling stage,and the differences in biomass,yield and its components were studied between shading treatment and control treatment without shading, finally the major low light tolerant wheat varieties were screened.The results showed that the biomass,yield,thousand-grain weight,grain number per spike of all wheat varieties of the shading treatment decreased,the decrease ranges were different among different varieties,and the decrease range of yield was higher than those of biomass,thousand-grain weight,grain number per spike.The percentage of dry straw weight of shading treatment increased. Thousand-grain weight and grain number per spike were significantly positively related with yield,thousand-grain weight,grain number per spike and yield were significantly affected by variety and shading,and the decreases of thousand-grain weight and grain number per spike were the main factors for decrease of yield caused by shading.The decrease range of biomass and thousand-grain weight and increase range of percentage of dry straw weight were significantly positively related with decrease range of yield.The wheat varieties were divided into three types by the cluster analysis,including low light tolerant type,low light sensitive type and middle type.Low light tolerant varieties included Xiangmai 56,Xiangmai D31,Nannong 0686,Xiangmai 55,Wanximai 0638,Zhengmai 9023,Yangmai 22,Zhengmai 7698,Wanke 06290,Luomai 6010,Jingmai 102,Fumai No.8,Nongda 195,Yangmai 158 and Fumai No.9,which could be used as main low light adaptive varieties.

Key words: Wheat, Shading, Filling stage, Low light tolerance, Yield, Variety screening