【摘要】 <正> 目前,我国玉米育种正处于爬坡阶段,表现在遗传基础越来越窄,籽粒产量育种水平进展缓慢。群体改良是创造优良种质的重要方法,用多个自交系或地方品种随机交配若干代组成综合种作为群体改良的基础材料较为理想。外来种质的掺入将会增加其遗传变异性。对外来种质利用的一个有效方法是同当地适应的玉米种质组成综合种进行改良,研究表明半外来种质的综合种在育种实践中的应用是鼓舞人心的。本文采用三重测交法(简称TTC 法)对几个在本地生长发育良好,开花成熟正常的外来材料与我国四个地方品种不完全更多还原

【Abstract】 Triple Test Cross（TTC）was used to study genetic components of quan- titative characters in half exotic germplasm population（ML）of maize （Zea mays L.）.Epistasis on ear weight and yield per plant,additive vari- ance for the characters,dominant variance and Ⅰ₁ type epistasis for most traits was found significant.Some dominance were bidirections,some were onedirection,The genetic variance was dominantly attributed to additive effect.更多还原