Heat-Tolerance Rice Varieties from National Regional Trial in Upper Reaches of Yangtze River:Identification and Evaluation
For better reducing the impact of global climate change on rice production,the heat-tolerance of 476 national rice varieties in the upper reaches of the Yangtze River from 2020 to 2022 had been identified and evaluated under both natural field and greenhouse conditions in this study.The results showed that tested varieties had generally good heat-tolerance at flowering stage,with 67,324,49,30 and 6 varieties reaching grade 1,3,5,7 and 9,accounting for 14.1%,68.1%,10.3%,6.3%and 1.3%respectively.The overall heat-tolerance performance of tested varieties in different years was as follows:2021＞2020＞2022.The overall heat-tolerance performance of different types of rice varieties showed as follows:two-line hybrid rice＞three-line hybrid rice＞conventional rice.The overall heat-tolerance performance of varieties from different trial channels showed as follows:green-channel trial＞national unified trial＞alliance trial.The 391 varieties with stronger or strong heat tolerance identified in this experiment can be preferentially promoted and applied in the heat-damaged frequent areas of the upper reaches of the Yangtze River,on the premise of taking the yield,quality and disease resistance into account.For 49 varieties with general heat tolerance,the planting areas of them should be limited strictly during the approval and promotion to avoid planting in areas with frequent heat damage,and 36 varieties with weak or weaker heat tolerance are recommended to be particularly cautious in the approval.
NETL
NSTL
万方数据
