环境温度对杂交粳稻不育系开花习性的影响

Effects of Environmental Temperature on Hybrid Rice Cytoplasmic Male Sterile(CMS) Lines Flowering Habits

[目的]探讨不同高低温度下杂交粳稻不育系开花习性。[方法]不育系选用吉林省和黑龙江省最新育成的三系粳稻不育系T176A和松黏5022A。环境温度设32、35℃高温和15、17℃低温。[结果]32和35℃高温处理可以促进北方三系粳稻不育系提早开花,提前开花高峰,增加午前花率。15和17℃低温处理可抑制不育系和保持系开花,降低午前花率。35℃高温和15℃低温处理后,不育系柱头活力均没有显著变化。[结论]该研究可为北方杂交粳稻制种提供理论依据。

[Objective] The aim was to discuss the flowering habits of hybrid rice CMS lines under different high an low temperature.[Method] The tested two sterile lines,T176A and Songnian 5022A,were bred by Jilin and Heilongjian newly.The designed high temperature was 32,35 ℃ and low temperature was 15,17 ℃.[Result] The flower time and flowering peak value were all ahead of time,and the average spikelet flowering rate before noon increased under 32 and 35 ℃ temperature.The 15 and 17 ℃ temperature treatments restrained blooming of sterile lines and restorer lines and decreased their average spikelet flowering rate before noon.There were no significant change of stigma vigor between the two CMS lines after treated under high temperature 35 ℃ and low temperature 15 ℃.[Conclusion] The study provide a theoretical basis for hybrid rice seed production in Northern China.