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[目的]构建两系不育系水稻P88S育性转换的积温模型。[方法]对2005年和2006年P88S在海南育性转换的试验数据进行分析。[结果]发现P88S在气温在26～28℃之间的可育性是由温度的绝对值和温度的累积效应决定的,并得到了1个基于双稳态的温度累积效应模型。[结论]利用积温模型可以有效地说明两系不育系春秋季育性转换温度的不对称性,即从可育转换为不育需要更高的温度,从不育转换为可育则需要更低的温度,并说明影响水稻育性的因素可能存在累加效应。
[Objective] The aim was to construct the temperature accumulation model of P88S fertility transformation in two-line CMS line. [Method] The data of P88S fertility transformation in Hainan in 2005 and 2006 were analyzed. [Result] The results showed that the fertility of P88S at temperature between 26 ℃ and 28 ℃ was determined by the cumulation effect of temperature absolute value and temperature, and a bistable temperature cumulative effect model was obtained. [Conclusion] The accumulative temperature model could effectively explain the asymmetry of fertility transition temperature in spring and autumn in two-line sterile line, that is, the temperature needed to transform from fertile to sterile requires a higher temperature, and the transformation from sterile to fertile need more Low temperature, and explain the factors that affect rice fertility may exist additive effect.