豆科模式植物蒺藜苜蓿(Medicago truncatula Gaertn.)作图群体遗传分析

he germplasm of the annual medicago were been identified and screened for genetic mapping using agronomic character and SSR markers. A pair of parent of the M. truncatula W5160 and Jemalong was been select, which have remarkable difference between them on. The F2 population of the medicago truncatula was constructed with hybridized W5160×Jemalong. Using the major gene plus polygene model of quantitative traits, a joint analysis of multi-generations from the cross between W5160 and Jemalong was carried out to investigate the inheritance of the some agronomy traits. The results showed that The genetic diversity of the 19 annual medicago germplasm from different resource was ample. Jemalong, DZA and Caliph from medicago truncatula germplasm have remarkable difference. The results of joint analyses of P1，P2，F1and F2 generations of W5160×Jemalong showed that the branches and seed yield inheritance was controlled by two major genes and polygene mixed inheritance model. The inheritance model of the length of branches,100-pod weight, biomass and seed yield fitted two major genes plus polygene model. The heritability values of the major genes of F2 population were more higher, the heritability values of those polygene were lower. In the improvement of breeding of the medicago, accumulating polygene should be emphasized, while utilization of major genes is preferred. Key words: Medicago truncatula, SSR Markers, Mapping population, Genetic analysis