光敏核不育水稻的光温反应研究 Ⅲ.减数分裂期温度对两个籼稻光敏不育系育性转换的影响

Studies on the Response of Photoperiod Sensitive Genic Male Sterile(PGMS)Rice to Photoperiod and Temperature Ⅲ.Effect of temperature at meiosis on the fertility of 2 PGMS indica strains

在人工控制条件下研究了在15小时长光照下减数分裂期的不同温度(23.3～30.3℃)对籼稻光敏不育系W6154S和5460S育性转换的影响。结果表明,温度对育性的影响因温度的高低及处理持续时间长短而异,不同的材料对温度的反应不同。5460S从不育转为可育的临界温度在26.4℃左右,而W6154S在处理温度范围内均出现自交结实现象,表明供试的W6154S株系育性转换的临界温度可能超过30.3℃。提出了深入研究影响籼稻光敏不育系育性转换的临界温度的建议。

Effect of temperature (daily average air temperature 23.3℃--30.3℃) at meiosis on the fertility.of PGMS indica strains, W6154S and 5460S, was studied under controlled conditions. The resultsindicated that the effect was different with different temperatures and durations, as well as withdifferent PGMS strains. Under longer daylength of 15.0 hours, the critical temperature for thetransition of 5460S from sterile to fertile was about 26.4℃, and for that of W6154S, probablyabove 30.3℃. Measurement of the critical temperatures influencing the fertility of PGMS rice infurther studies was also discussed.