大豆苗期耐旱性与部分根系性状的遗传

INHERITANCE OF DROUGHT TOLERANCE AND ROOT TRAITS OF SEEDLING IN SOYBEANS

采用主基因+多基因混合遗传分离分析法,联合分析了母本干旱敏感型品种宁海晚黄豆(P1)、父本耐旱型品种晋豆19(P2)及其杂交后代F1和F2四世代群体,研究了大豆苗期耐旱性及大豆苗期根总长、根干重和主根长的遗传规律,结果显示,它们皆受2对主基因控制,且皆有多基因效应,其主基因效应分别表现为加性-显性-上位性效应、完全显性效应、等显性效应和等加性效应,主基因遗传率分别为12.16%、45.26%、16.95%和19.15%,多基因遗传率分别为83.54%、44.55%、72.20%和51.88%。

The genetic basis of drought tolerance, full root length, dry root weight and main root length of soybean seedling under the condition of water deficit were analyzed jointly by the P1, P2, F1 and F2 generations derived from the cross （Ninghaiwanhuangdou x Jindou19）, and mixed major genes and polygene inheritance models of quantitative traits of joint segregation analysis of P1, P2, F1 and F2 were employed. The results showed that the inheritance of drought tolerance, full root length, dry root weight and main root length were controlled by two major genes and polygene. The two major genes showed dominant and additive and epistatic, full dominant, equal dominant, and equal additive respectively. The heritability value of major genes was 12.16%, 45.26%, 16.95% and 19.15%, and the heritability value of polygene was 83.54%, 44.55%, 72.20% and 51.88% respectively.