对燕麦穗重的直接及间接选择

DIRECT AND INDIRECT SELECTION FOR PANICLE GRAIN WEIGHT IN OATS

燕麦(A.sativa L)穗重是重要的籽产构成因素,但由于遗传力低,对其选择的可靠性较差.本试验以F_3代杂种为材料,依收获指数十株高的指数对穗重进行了间接选择,并和其直接选择的效果进行了比较.结果表明,收获指数和株高的遗传力均较低,同时它们同穗重的遗传相关也不够高,间接选择的效果不明显.另外,收获指数同株高呈高度负遗传相关(γ_g=-0.6392),把收获指数高和植株高两个特性结合在一起也是困难的.

The panicle grain weight of oats (A.sativa L.)is one of the most important components of grain yield. However,the direct selection for it is mostly inefficient for the low heritability. In the experiment, indirect selection via criteria of harvest index (HI)+plant height (PH)for increase panicle grain weight was carried out on a population of F_3,and the effects were comparied with those from the direct selection. The results showed that both HI and PH had low heritabilities,and their genotypic correlations with panicle grain weight were not high enough. Therefor,the indirect seletion was not efficient. In addition,because of the high negatire genotypic correlation between HI and PH (γ_g=-0.6392),it is difficult to combine high HI and tall plant together.