Abstract

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Title:: Genetic Analysis of Seed Germination Characters under Submergence Stress in Two Recombinant Inbred Line Populations of Glycine max × Glycine soja

Author(s):: LIU Rui-jun; JING Jing; LI Zhi; WANG Zi-li; LI Xu-liang; KONG Jie-jie; GAI Jun-yi; ZHAO Tuan-jie

Keywords:: Soybean; Recombinant inbred lines(RIL); Seedsubmergence tolerance; Major genes plus polygene mixed inheritance model; Separation analysis

Abstract:: Flooding stress after soybean planting can cause poor seedling stand and consequently yield reduction.Development of soybean cultivars with good waterlogging tolerance is one of the most effective ways to reduce production loss.In the present paper,two recombinant inbred line populations,NJRISP and NJRINP,derived from the crosses between two sensitive cultivars Nannong 493-1,Nannong 86-4 and one tolerant wild soybean PI342618B were used to reveal the variation and inheritance of the tolerance to seedsubmergence at germination stage.It showed that there were significant differences and high genetic variation in the RIL populations.The heritability values of the germination rate at 3 and 5 d after treatment,root length and sprout length were higher than those of other indicators,and there were highly positive correlations among the four traits.The results from segregation analysis under major genes plus polygene mixed inheritance model showed that the inheritance of germination rate at 3 d and 5 d after treatment fitted four major genes model(H or I genetic model).The values of major gene heritability were more than 93%,and the polygenes were relatively low.All the tolerant alleles were only detected in wild soybean,indicating the existence of elite tolerant genes for soybean tolerance breeding.