植物某一性状的具体值，如棉花的高度，纤维长度等，一把用于数量性状的qtl定位。
在对分离世代进行选择处理时，可以选择那些目标性状值较大，而协调指数较小的类型。
The variants which had high value of goal trait and low harmonizing index could be selected when dealt with the separating generations.
通过分析得出选择指数的通径分析的实质是选择性状与复合育种值的相关遗传力分解。
We found the essence of path analysis of selection index is analysis of correlative heritability between traits and aggregate genotype.
前者采用逐步回归筛选与目标性状相关联的标记，由此估计个体的标记值，作为选择的依据；
The former uses marker score as selection criterion estimated based on the markers showing significant associations with the target quantitative trait screened by stepwise multiple regression.
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