黑木相思半同胞子代家系苗期性状的遗传分析

Genetic Analysis for Seedling Traits of Half-sib Progeny in Acacia melanoxylon

以30个黑木相思家系的半同胞子代为研究对象,根据苗期性状测定结果估算苗高、地径、叶面积、叶长、叶宽、叶长宽比的变异系数,进行遗传分析,筛选出优良家系和优良单株。结果表明:黑木相思半同胞子代6个苗期性状中,地径的变异系数最大,苗高的变异系数最小,30个家系遗传多样性较高,选育潜力较大;在家系间和家系内均存在极显著差异;苗高的家系遗传力为0.986,单株遗传力为0.818,地径的家系遗传力为0.920,单株遗传力为0.560,受较高遗传力控制;苗高和地径的相关性最大。对30个黑木相思半同胞子代群体进行优良家系和优良单株的选择,选择出3个优良家系、12个优良单株。

Thirty half-sib progenies of Acacia melanoxylon were studied,the coefficients of variation of seedling height(H),ground diameter(D),leaf area(S),leaf length(LL),leaf width(WL)and leaf length width ratio(LL/WL)were estimated,and genetic analysis was carried out.Excellent families and individual trees were selected.The results showed that among 6 seedling traits in half-sib offspring,the maximum coefficient of variation is ground diameter,and the minimum is seedling height.The genetic diversity among 30 families was high and the breeding potential was great;there were significant differences among and within families;the family heritability of seedling height was 0.986,and the individual heritability was 0.818.The family heritability of ground diameter was 0.920,and the individual heritability was 0.560,which was controlled by higher heritability;the correlation between seedling height and ground diameter was the largest.Thirty half-sib progeny populations were selected for excellent families and excellent trees,and 3 excellent families and 12 individual trees were selected.