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

Abstract

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 from HA 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 F₃than those from F₃ progenies. The results suggested better prospects of deriving superior pure-lines with desired traits/combination of traits from inter-mated population.