Studies on combining ability gene action for seed yield its component traits in urdbean Vigna mungo L Hepper

Abstract

newline The present investigation entitled Studies on combining ability gene action for seed yield its component traits in urdbean (Vigna mungo (L.) Hepper) was undertaken to study the nature and magnitude of gene action for yield and its component traits and to identify potential parents that can be utilized in a breeding programme for high seed yield and early maturity. Nine urdbean genotypes were crossed in a half diallel, following Griffing s Method 2 and Model I. Experimental material comprising of nine parents, 36 F1 s and one check (Palampur-93) were evaluated in CRBD with three replications in kharif 2017 at Palampur. The combining ability analysis revealed significant GCA and SCA variances for all the traits except pod length, indicating that most of the traits were governed by both additive and non-additive gene action. The estimates of genetic components of variances as per Griffing s approach indicated partial dominance in seeds per pod and overdominance in all the other traits. DU-1 was good general combiner with respect to early flowering; Him Mash-1 and DKU-98 for early maturity; HPBU-111 and KU-553 for number of branches per plant and pods per plant; and DU-1 and KU-553 for seed yield. KU-553 was the most desirable parent as it exhibited significant GCA effect for most of the traits viz., branches per plant, pods per plant, pod length, biological yield, seed yield and crude protein. DKU-98 × IC-281994 was good specific combiner for maximum number of traits along with seed yield per plant. Significantly high SCA effects were observed in Palampur-93 × KU-553, Him Mash-1 × HPBU-124, HPBU-111 × KU-553 and DKU-98 × IC-413304 for earliness. Promising crosses with respect to seed yield and its component traits were HPBU-124 × HPBU-111, Palampur-93 × DU-1, HPBU-124 × DU-1, HPBU-111 × IC-281994, DU-1 × DKU-98 and DU-1 × IC-413304. newlineHayman s genetic component analysis revealed that majority of traits had significant additive and non-additive genetic variance with preponderance of later. The asymmetr