Parent genome contribution and its relationship with grain yield in backcross‐derived lines of soybean (Glycine max)

Abstract

AbstractIntrogression of yellow mosaic disease (YMD) resistance and effect of recurrent parent genome (RPG) on grain yield was studied in 84 soybean genotypes from four populations namely, F2:7, BC1F6, BC2F5 and BC3F4 derived from cross JS335 x SL525. It was observed that in F2:7, BC1F6, BC2F5 and BC3F4 derived lines, RPG contribution was 42.5%, 54.9%, 66.4% and 77.6%, respectively, which is significantly less than expected values. Linkage drag from donor parent with YMD resistance gene may be a possible reason for such deviations. Average grain yield per plant in F2:7, BC1F6, BC2F5 and BC3F4 generations was observed as 13.0, 14.3, 14.9 and 16.1 g, respectively. It was observed that genotypes with more than 80% RPG observed to have both YMD resistance and good yield potential. Graphical genotyping (GGT) analysis revealed that maximum RPG was recovered in chromosomes 8 and 10 and maximum introgression occurred in chromosomes 6 and 19. Our results demonstrated that RPG was positively associated with yield as evident from yield increase with increase in RPG.