基因型与高温环境互作对杂交水稻整精米率的影响OA北大核心CSTPCD

In order to improve the head rice rate in high temperature and arid areas,15 hybrid indica combinations bred with 3 sterile lines(Yexiang A,Huhan 82S,Chuankang 606A)and 5 restorer lines(Luhui 107,Luhui 127,Luhui 276,Luhui 1156,Luhui 6150)were used as materials in 2021 and 2022,and the effects of interaction between hybrid rice genotype and environment on head rice rate were studied in the early and late planting season,and at two drying temperatures of 40℃ and 80℃ respectively.The results showed that the annual ecological conditions and rice drying temperature had the greatest influence on the head rice rate.The average head rice rate(48.92％)in 2021 was 181.00％higher than that in 2022(17.39％,a rare high temperature year),and the average head rice rate(45.94％)at a drying temperature of 40℃ for rice was 125.00％higher than that at 80℃(20.37％).The influence of the restorer line was the second,The combinations bred with Luhui 6150 had the highest head rice rate,with an average of 13.85％-25.34％higher than the comninations bred with other restorer lines.The male sterile lines had little effect,the combination bred with Yexiang A had the highest head rice,with an average of 8.97％-9.45％higher than the combination bred with other male sterile lines.The special combining ability of the sterile line and the restorer line had great influence on the head rice rate,and the general combining ability of the restorer line was significantly higher than that of the sterile line.The planting season had the least effect on the head rice rate,and the head rice rate in late season was 2.97％higher than that in early season.Through the improvement of restorer line,the hybrid combination with high special combining ability for the head rice rate was beneficial to greatly improve the head rice rate under the suitable temperature of filling stage and rice drying temperature.