Intergenerational relationship and Multi-trait Genotype-Ideotype Distance Indexing (MGIDI) in inter-varietal cross derivatives of black gram [Vigna mungo (L.) Hepper.
2025
Anbazhagan, Surendhar | Palaniyappan, Jayamani
Black gram is a highly self-pollinated short-duration crop cultivated in various cropping systems viz., rainfed, intercrop and rice fallow. In the present study, hybridization was made between 2 black gram varieties viz., CO 6 and VBN 11, aimed to develop the recombinants and select superior progenies through Multi-trait Genotype-Ideotype Distance Index (MGIDI) at Tamil Nadu Agricultural University, Coimbatore. The parent-offspring regression analysis was carried out in the F3 and F4 progenies of CO 6 × VBN 11. The significant regression and intergenerational correlation coefficients were observed for all the traits studied. The narrow sense heritability was found to be high for the number of seeds per pod. The other traits viz., plant height, number of branches per plant, number of clusters per plant, number of pods per cluster, number of pods per plant, pod length, number of seeds per pod, hundred seed weight and seed yield per plant showed moderate narrow sense heritability. The MGIDI was calculated for 62 F4 progenies of CO 6 × VBN 11 considering nine yield component traits. In F4 progenies, high broad sense heritability was observed for all the yield-contributing traits and high selection gain was recorded for seed yield per plant (49.77%), number of branches per plant (46.29%), number of pods per plant (37.74%) and number of pods per cluster (20.80%). Based on the MGIDI, six F4 progenies viz., P1, P6, P22, P49, P50 and P53 were selected. The selected progenies could be further evaluated and yield tested for commercial exploitation.
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