以2个抗倒伏有差异的自交系GMY-1和GMY-2为亲本，分别对双亲、F1和F2群体的株高、植株抗倒伏性、穗下节间长度和穗长4个性状进行了田间调查和遗传分析。结果表明，GMY-2表现植株矮、穗下节间短、植株抗倒伏性高、穗较短；除穗长外，F1代其余性状均表现正向杂交优势，而F2代各性状明显衰退。株高、穗下节间长度和抗倒伏性的遗传力相对较高，均达60%以上，适合早代进行遗传改良；而穗长遗传力较低，仅为17.92%，适合晚代进行遗传改良。

There is difference of lodging resistance between the inbred lines GMY-1 and GMY-2 as parents， This paper investigates and genetic analyzes respectively the plant height， lodging resistance， ear internode length and panicle length of parents， F1 and F2 in the field. The result shows that GMY-2 of plant height is dwarf， and panicle internodes is short， lodging resistance is high， ear is shorter； and other characters of F1 generation are showed positive heterosis except panicle length， and the characters of F2 generation are decline significantly. The heritability of plant height， internode length and lodging resistance is relatively high， reached more than 60%， suitable for genetic improvement of early generation； panicle length heritability is low， only 17.92%， suitable for genetic improvement of late generation.

S512.3

甘肃省高等学校研究生导师科研计划项目(1012-02)