假俭草杂交后代部分外部性状的遗传分析

Genetic analysis of morphological characters of centipedegrass hybrids

选用假俭草2份外部性状存在差异的种源材料E102和E092(1)进行杂交,获得F1分离群体,应用植物数量性状主基因+多基因混合遗传模型分析方法对F1群体的叶片长度与宽度、节间长度与直径及草层高度等外部性状进行遗传分析,以初步明确假俭草上述性状的遗传特性。结果表明,1)在调查的杂交后代5个外部性状中,变异系数由大到小依次为叶片长度(23.39%)>节间长度(21.89%)>草层高度(15.32%)>节间直径(7.41%)>叶片宽度(6.77%),变异系数最大的为叶片长度,最小的为叶片宽度。2)叶片长度的最佳遗传模型为A-1模型,即1对主基因模型,该主基因表现为加性和部分显性或超显性,主基因遗传率为68.98%;节间长度的最佳遗传模型为A-4模型,1对主基因模型,该主基因表现为负向完全显性,主基因遗传率为47.37%;草层高度的最佳遗传模型为B-6模型,即2对主基因模型,主基因表现为等显性模型,主基因遗传率为47.20%;叶片宽度和节间直径的最佳遗传模型均为A-0模型,即无主基因模型。

F1 segregating populations were obtained from two accessions of centipedegrass [E102 and E092（1）] with different morphological characters.The heredity of five morphological characters,i.e.leaf length and width,internode length and diameter,and height of turf in F1 populations,were analyzed by the major gene and polygene mixed genetic model,to reveal the genetic mechanism of these morphological characters in centipedegrass.The greatest variation was found in the leaf length and the coefficient of variance（CV） was 23.39%,followed by the variations in internode length,height of turf and internode diameter with the CVs of 21.89%,15.32% and 7.41% respectively.The variation in leaf width was the least,CV 6.77%.One major gene model with additive,partial dominance or over dominance（A-1） was the most suitable model for the leaf length and the heritability of the major gene was 68.98%.One major gene model with negative entire dominance（A-4） was the most suitable model for internode length and the heritability of the major gene was 47.37%.A two major genes model with co-dominance（B-6） was the most suitable model for the height of turf and the heritability was 47.20%.The most suitable model for leaf width and internode diameter was for no major genes（A-0）.