摘要： 以芝麻4个早熟品种为母本，6个晚熟品种为父本，采用NCⅡ设计，对其24个杂交组合的生育阶段进行了分析，结果表明：在出苗~现蕾和盛花~封顶阶段，早熟品种比晚熟品种生育天数短，生长发育快，而在终花~成熟阶段，早熟品种比晚熟品种生育天数长，灌浆时间长，这是早熟品种取得高产的重要生理原因；现蕾早晚可作为芝麻早熟性的重要指示性状，而初花早晚与成熟期没有直接关系；在同一生育期内，各阶段的生育天数是互相制约的。

关键词: 芝麻, 生育期, 早熟性, 相关系数, 遗传力

Abstract: NCⅡdesign was made by using 4 early-maturation varieties as material parents, 6 late-maturation varieties as paternal parents, the results showed that the development days and speed of the early-maturation varieties were shorter and faster than the late-maturation varieties from emergency to squaring and from flourishing flowering to ending flowering, but the development days, viz. filling days longer than the late-maturation varieties, it was an important physiological reason which resulted in the high yeild in the early-maturation varieties; the squaring time was an important indicative character of sesame earliness, which no direct relationship existed between beginning flowering and ripening; the development days of different stage was restricted each other in one growth period.

Key words: Sesamum indicum L., Growth period, Earliness, Coefficient of correlation, Heritability