粳型三系杂交稻亲本开花习性研究

Study on Flowering Habit of Sterile and Restorer Lines of Hybrid Japonica Rice

研究了4个杂交粳稻不育系、15个恢复系的开花习性，结果表明：不育系的开花历期平均为7．0d，而恢复系的开花历期平均2．5d，二者差别达3．5d；不育系的午前花率平均为58．8％，而恢复系的午前花率平均为73．9％；多数恢复系的开花高峰出现在开花后第2～3d，而不育系却出现在开花后4～5d（中作59A除外）。除不育系3A外，其它不育系的日开花高峰均晚于恢复系。不同的恢复系之间在开花习性上也存在差异。研究粳稻不育系和恢复系的开花习性，能够有效调控其亲本的花期、花时，提高制种产量。

The flowering habit of 4 sterile lines and 15 restorer lines of hybrid japonica rice Was observed to improve seed yield by effectively adjusting parents＇ flowering stage and duration. The results showed that the flowering duration of sterile lines and restorer lines was 7.0 d and 2, 5 d and the average forenoon flowering rate of sterile lines and restorer lines was 58. 8% and 73. 9% respectively, and the flowering peak of most restorer lines and sterile lines （except Zhongzuo 59A） was 2-3d and 4-5d after flowering, the daily flowering peak of sterile lines（except 3A） was later than restorer lines, and there was difference in flowering habit between different restorer lines.