巢式杂交群体的花生荚果性状遗传模型分析

采用主基因+多基因遗传模型,对巢式群体的5个组合的F2家系的荚果性状进行了遗传模式解析,以期了解巢式杂交群体的荚果性状遗传变异特点.结果表明,巢式杂交群体具有丰富的荚果性状的变异类型,荚果长、宽和百果重在5个组合中的最小值至最大值变异幅度分别为(14.30～22.09)mm～(38.36～45.12)mm、(7.06～...

Genetic model analysis of peanut pod traits in nested-crossing population

The genetic pattern of pod traits wereanalysed using the major gene plus polygene model in five combinations of F2 families of a nestedcrossing population in peanut to dissect the genetic variation in nestedcrossing population. Results revealed rich variations in the five pod traits inthe nested combination. The ranges of pod length, pod width, and hundred-podweight were（14.30-22.09）mm -（38.36-45.12）mm,（7.06-10.47）mm -（17.13-22.74）mm, and（62.41-94.38）g -（266.75-364.00）g, respectively. There was astrong positive correlation between pod length and pod width, pod surface area,pod surface perimeter and hundred-pod weight, but little correlation with ratioof pod length to pod width; pod width was positively correlated with podsurface area, pod surface perimeter and hundred-pod weight, but negativelycorrelated with pod length to width ratio. The genetic models of different podtraits in different combinations were different, and the best genetic modelswere two major gene of additive - dominant model and two major gene of additive- dominant - epistatic model. The heritability of major genes was 22.79% - 91.62%,and the genetic effects of the major genes in different families differed toeach other, which implied the effects of multiple alleles or non-alleles aswell as the genetic background on the pod traits. The results provide materialand genetic basis for the further QTL mapping of pod traits and peanut breedingof specific pod shapes.