Abstract:

By 2018, 39 soybean cultivars were bred in Guangxi, and their pedigrees were studied to analyze the formula, geographical origin and genetic contribution value of nucleus (quality). The results showed that, 39 cultivars（28 spring soybeans and 11 summer soybeans）were traced back to 40 nuclear and 17 cytoplasmic ancestors. The genetic contribution rates of nucleus (cytoplasmics) from native, other provinces and foreign ancestral parents were 39.42% (58.98%), 45.75% (38.46%) and 14.83% (2.56%) respectively. The parents of nuclear ancestors mainly came from southern China, Brazil and the United States with similar local and ecological conditions in Guangxi, the ancestor parents of spring soybean germplasm mainly came from Guangxi, Hubei and Beijing, the ancestor parents of summer soybean germplasms mainly came from Guangxi, Hubei and Shanghai; Since 2006, 96% of soybean cultivars had been bred by parent combination of bred soybean cultivars and foreign introduced soybean cultivars; Eight core spring soybean ancestors such as Jingxizaohuangdou and five core summer soybean ancestors such as Pingguodou were summarized. The genetic basis of soybean varieties in Guangxi was relatively rich, but it was necessary to strengthen the research and utilization of New Germplasms in order to expand the nuclear-cytoplasmic basis of soybean varieties. 

Key words: Guangxi, cultivars, ancestor parent, geographical resource, genetic contribution