Submitted to: Biennial Conference on Molecular and Cellular Biology of the Soybean
Publication Type: Abstract Only
Publication Acceptance Date: 8/28/1998
Publication Date: N/A
Technical Abstract: We have screened 121 RFLP marker loci that were selected for uniform coverage of the soybean genome on 35 North American ancestors, 66 North American modern cultivars (MG 000-VIII), 59 modern Chinese cultivars (MG 000-IV), and 30 modern Japanese cultivars (MG 0-VII). The Asian cultivars have resulted from over 70 years of continuous breeding and based on pedigree information were unrelated to modern North American cultivars. Our goal was to characterize the RFLP genetic diversity of the North American, Chinese, and Japanese cultivars and identify specific pairs of North American/Asian cultivars that were the most diverse based on the RFLP data. Genetic distance (GD) was calculated as GD = (1.0 - similarity coefficient). The average GD for all possible pairings of the 66 North American cultivars with all Chinese cultivars or all Japanese cultivars were 0.338 (range 0.177 - 0.474) and 0.360 (range 0.292 - 0.472), respectively. These results show that mating a randomly selected North American cultivar with a randomly selected Japanese or Chinese cultivar should produce progeny as genetically diverse as mating any two randomly selected North American ancestors. Both the modern Chinese and Japanese cultivars appear to be desirable germplasm for further improvement of North American cultivars.