Introgression of urdbean anthracnose resistance and yield components involving Vigna mungo x V umbellata hybridization

Abstract

Introgression of urdbean anthracnose resistance and yield components involving Vigna mungo x V. umbellata hybridization was carried out with the objective to develop inter-specific hybrids, study inheritance of urdbean anthracnose (Colletotrichum truncatum) resistance and nature and magnitude of gene effects for yield and its component traits. Inter-specific crosses were attempted between three genotypes each of V. mungo and V. umbellata to transfer genes for disease resistance and yield related traits. Inter-specific hybridization revealed the presence of pre-fertilization barriers; confirmed by the frequency of pod set and post-fertilization barriers as F1and#8223;s exhibited reduced germination and sterility. The frequency of inter-specific hybridization, radicle and plant production percentage, revealed the genotype specific response of both the species. Inheritance of anthracnose leaf spot under natural and artificial epiphytotic conditions in KUG-216 x HPBU-111, KUG-216 x Palampur-93 and IPU-05-13 x Palampur-93 indicated the involvement of single dominant gene for disease resistance. In parents; KUG-216 and IPU-05-13, test of allelism is suggested to determine whether the gene present in them is similar or not. Six-generations of four inter-varietal crosses (KUG-216 x HPBU-111, KUG-216 x Palampur-93, IPU-05-13 x HPBU-111 and IPU-05-13 x Palampur-93) were evaluated to derive information on nature and magnitude of gene effects for yield and its component traits. Scaling tests revealed inadequacy of additive-dominance model for all the traits indicating the presence of non-allelic interactions. Duplicate gene action was observed for six characters in KUG-216 x HPBU-111, five in KUG-216 x Palampur-93, one in IPU-05-13 x HPBU-111 and two in IPU-05-13 x Palampur-93 and complementary gene action for one character each in KUG-216 x Palampur-93 and IPU-05-13 x HPBU-111. Therefore, selection in later generations for duplicate gene action and early generation selection in complementary gene action involving intermatings in