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通过分期播种试验,对生产上应用的水稻三系不育系天丰A、龙特浦A、Ⅱ-32A、金32A的花粉败育类型与始穗前15 d温、光条件的关系进行了探讨。结果表明,供试三系不育系的花粉败育程度在不同的温度下表现不同,天丰A的花粉可染率和自交结实率及Ⅱ-32A的花粉可染率均与始穗前15 d的日平均气温呈显著正相关,龙特浦A的花粉可染率和自交结实率均与始穗前15 d的日平均气温呈显著负相关,不育系育性与光长相关不显著。据初步观察,温度对不育系育性的影响时期为幼穗雌雄蕊分化期至减数分裂期。
The relationship between the pollen abortion types of Tianfeng A, Longtepu A, Ⅱ-32A and Jin 32A and the temperature and light conditions at 15 d before the initiation of panicle initiation was studied by staged seeding experiment Discussion. The results showed that the pollen abortion rate of the three-line CMS lines differed at different temperatures. The pollen viability, selfed seed setting rate and pollen dyeing rate of Ⅱ-32A of Tianfeng A were all the same as those of The average daily temperature of 15 d showed a significant positive correlation. The pollination rate and self-fertility rate of Longtepu A were negatively correlated with the daily mean temperature of the first 15 d, while the fertility of the sterile line was related to the light length Not obvious. According to the preliminary observation, the effect of temperature on the fertility of CMS was from the stamen stage to the meiosis stage.