Abstract: Twenty eight accessions of soybean (Glycine max (L.) Merr.) selected from 83 ones from Huanghuaihai were tested in two years for their tolerance to drought by using the mean membership index value averaged over those of plant height, leaves number, dry root weight and dry stem and leaf weight. One most tolerant accessions (Rank 1) was identified. There existed very significant correlations between drought tolerance and relative values of dry root weight, total root length, and root volume (per plant dry weight basis), respectively, which could be used as root indicators of drought tolerance. The RIL population derived from Kefeng 1 × Nannong 1138-2 was used to analyze the inheritance of the three relative root traits by using the segregation analysis of quantitative trait under the major gene plus polygene mixed inheritance model. The results showed that between the two parents, the relative values of dry root weight, total root length and root volume were respectively controlled by two major genes (linked together for the latter two traits, recombination value being 4.30% and 1.93%, respectively) plus polygenes with their major gene heritability values 62.26%-91.81% and polygene heritability values 2.99%-24.75%, indicating that major gene, especially the one with large effect, accounted for a major part of the genetic variation between the two parents. major gene additive effect could be intensified for improving all of them.

Key words: Soybean (Glycine max (L) Merr.), Drought tolerance, Root trait, Inheritance, Segregation analysis of quantitative trait

CLC Number: 

• S565.101