Difference of Extreme High Temperature Tolerance of Hybrid Rice Parents at Reproductive Stage
High temperature has a great influence on the yield of hybrid rice seed production,and it is particularly important to develope high temperature tolerant hybrid rice parents.In 2022,a total of 150 hybrid combinations of 20 sterile lines and 43 restorer lines were used for seed production experiments in Changsha,Hunan Province,and extreme natural high temperature conditions in summer were used to screen heat-tolerant hybrid rice parents.The results showed that after a long period of extreme high temperature with the maximum temperature exceeding 40 ℃ during booting and heading stage,the restorer lines F81,Shuanghui 459,8X011,Xiangnonghui 1442,Lezhan,Xiangnonghui 0751,X155,Xiangnonghui 887,X120,R8022,5W0373,Shuanghui 429,R0859,4WH0818,DY3,Shuanghui 1805,R1928 and R889 all had a selfed seed-setting rate of more than 80％,thus they had a strong heat tolerance.The average outcrossing seed-setting rates of the sterile lines 599S,Shuang 1S,Qin 886S,Xinxiang S and Zhan 998S were 34.5％,31.2％,33.1％,33.3％and 35.9％,respectively,and their highest outcrossing seed-setting rates were 53.6％,49.5％,46.1％,41.5％and 41.3％,respectively,which were higher than the average and highest outcrossing seed-setting rates of the other sterile lines,thus these sterile lines had a strong heat tolerance.In addition,the hybrid seeds produced by these sterile lines had a low glume-gapping seed rate,a low diseased seed rate and a high seed vigor level.To develop heterotic hybrid rice combinations by use of the above heat-tolerant parents,the large-scale and mechanized hybrid rice seed production can be realized in the plain area.
hybrid riceparentseed productionhigh temperature tolerance
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