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通过分期播种,对4个两系杂交稻组合在自然低温条件下进行穗期耐寒性鉴定,同时研究不同播种期对两系杂交稻生育特性及产量的影响。结果表明,在穗期遇上连续3d 以上低于23℃的低温天气,4个两系杂交稻组合与对照汕优63结实率开始下降,但仍均达75.0%以上;穗期遇上连续3d 以上低于20℃的低温天气,则影响较大,各参试组合穗抽不起来或结实率极低。不同播期处理对两优培九、金两优36的生育特性有一定影响,对5个参试组合的产量性状都有较大影响,播种愈迟,产量愈低。
The cold-tolerance of four two-line hybrid rice combinations under natural low temperature was identified by staging. The effects of different sowing dates on the growth characteristics and yield of two-line hybrid rice were also studied. The results showed that the seed setting rate of four two-line hybrid rice combination and control Shanyou 63 began to decline, but still reached 75.0% or more at low temperature, More than 20 ℃ in the cold weather, the greater impact, the combination of each spike can not afford the test or very low seed set rate. Different sowing dates had some effects on the reproductive traits of Liangyou Peijiu and Jinliangyou 36, and had a great impact on the yield traits of the five combinations. The later the sowing, the lower the yield.