Impact of F2 bi-parental mating on quantitative traits inter-relationships and frequency of transgressive segregants in Dolichos bean (Lablab purpureus L.)

  • Chandra kant, Ramesh, S. Vaijayanthi, P. V. Byregowda, M. Mohan Rao, A. Keerthi, C. University of Agriculture Sciences, GKVK Bangalore


Beneficial effects of F2 bi-parental (BIP) mating have been amply demonstrated in several self-pollinated crops. To explore such beneficial effects in Dolichos bean, a highly popular grain legume vegetable and self-pollinated crop in southern Karnataka, an investigation was carried out to assess the impact of inter se mating in F2 population derived fromHA 4 (a high yielding photoperiod in-sensitive determinate type released variety) × GL 37 (a photoperiod sensitive in-determinate type germplasm accession) on nine quantitative traits inter-relationship and frequency of transgressive segregants. Significant shift in correlation coefficient of fresh pod yield plant-1 with racemes plant-1 from -0.33* (in F3 progenies) to 0.19 (in BIP F3 progenies) suggested the possibility of increasing the number of racemes plant-1 without penalty in fresh pod yield plant-1 through selection. The frequency of individuals that surpassed higher scoring parent for days to flowering, racemes plant-1, fresh pods node-1, fresh pod yield plant-1 and 100-fresh seed weight was higher from BIP F3 than those from F3 progenies. The results suggested better prospects of deriving superior pure-lines with desired traits/combination of traits from inter-mated population. 

Research Article