文章从理论上推导出了性状漂移公式。该公式表明 ,一个纯系品种 ,即使其基因组成始终不变 ,在没有人工选择压力时 ,其性状也将向能提高群体繁殖力的方向产生定向漂移 ,如植株变高、籽粒蛋白质含量增加、粒质量降低、种皮色加深等 ,并对此进行了验证。利用该公式对水稻光温敏核不育系起点温度漂移现象进行了合理解释 ,并做了一些预测 ,以供检验。 The article deduces the formula of trait in theory. The formula shows that a pure line, even if its genetic composition is constant, will drift in a direction that can enhance population fertility without artificial selection of pressure, such as higher plant height, increased grain protein content, Reduce the quality of grain, deepen the seed coat color, and verify this. The equation was used to explain the temperature excursion in the starting point of the thermo-sensitive genie male sterile lines in rice. Some predictions were made for testing.