Genetic system of 1 000 seed weight in the 12 parents consisted of 3 major gene loci groups with an additive effect of 0.316 3~(??),-0.141 9~(?) and -0.003 7 and a dominant effect of -0.033 7, 0.184 3~(?) and -0.212 9~(?),respectively.

• 结果表明: 12个甘蓝型油菜亲本间千粒重性状受 3个主位点组基因控制,各主位点组基因效应的方向、大小不等。 3个主位点组基因的加性效应 (dM )分别为0 316 3**、-0 141 9*和-0 003 7;