Abstract

                                Phenotypic correlation of seed yield and its component traits were studied in four selected irradiated F,M, population, two three way and one double cross populations of blackgram advanced through bulk, individual plant selection (IPS) and single pod descent (SPD) method. All the twenty one populations exhibited significant positive correlation of plant height, number of clusters and pods per plant with seed yield per plant except three populations of bulk and one population of IPS method for plant height. Irradiated population of single cross 4 for pod length, single cross 1, 3 and three way cross 1 for number of seeds per pod exhibited significant positive correlation with seed yield per plant irrespective of the methods of advancement. The nature of association between pod length in three way cross 1 and number of seeds per pod in double cross advanced through bulk method was changed from negative to positive in IPS and SPD methods. Among the three methods of selection, single pod descent method showed a stronger magnitude and higher number of significant correlation in all the seven populations under study as compared to bulk and IPS methods. Most of the traits under study including pod length and number of seeds per pod contributed towards seed yield per plant in single cross F, M,, three way and double cross populations.

Key words : Blackgram, vigna mungo, selection methods, bulk, individual plant selection (IPS) and single pod descent method (SPD)