Identification and Utilization Evaluation of Heat Tolerance of 39 Medium Oryza sativa L.Varieties in Hubei Province in 2022
In order to identify and evaluate the heat resistance of 39 medium Oryza sativa L.varieties that had entered the second year of regional trial in Hubei Province in 2022 and to provide reference for the approval and promotion of new Oryza sativa L.varieties in Hubei Province,the natural high temperature climate characteristics of the heading and flowering in the Jianghan Plain to the filling and setting period were used to carry out research by sowing seeds in stages,using the method of combi-ning natural field identification and glass greenhouse identification.The results showed that the high temperature period of this year well covered the flowering period of the first sowing stage,as well as the gestation and flowering stages of the second and third sowing periods of the test materials,and fully met the requirements of the identification conditions.The temperature of the glass greenhouse also fully met the requirements of the identification conditions,and the identification results were valid.The heat resistance of 39 tested materials was excellent.Three varieties with high heat resist-ance,such as Jiaodao2806,Gongliangyou17 and Quanyou803,could be promoted and applied in Ory-za sativa L.areas with frequent heat damage after priority approval,and Jiaodao2806 could also be used as heat-resistant germplasm resources for breeding.Among the 29 varieties with strong heat tol-erance,they could be determined according to the comprehensive performance of other traits,and were popularized and applied in the heat damage frequent Oryza sativa L.area,among which 8 con-ventional varieties(lines)with strong heat resistance,such as Yangfunuo No.4,Xiangzhongdao No.2,Jincanzhan925,Huazhen166,Xiangzhongdao No.3,Chujingsimiao,Fuxiang 288 and Huanghua-zhan,had certain use value when the heat tolerance breeding germplasm resources were small.The heat resistance of 7 varieties was generally to weak,among which 3 varieties with weak heat resist-ance,such as Yuanliangyou888,CD3A/Yihui80 and Xiang19,should be eliminated first.Hualiangy-ou2134,Hualiangyou8620,Huyanyou1017 and Nanhong No.3 and other 4 varieties with average heat resistance should be especially cautious in their promotion and application.
heat tolerancenatural high temperature identificationglass greenhouse identificationutilization evaluationmiddle Oryza sativa L.variety
万方数据
维普
