Inheritance of Earliness and Vegetation Period in Pea (Pisum Sativum L.) Genotypes

Abstract

Abstract. A full diallel cross of four-parents was used to study gene action involved in the inheritance of earliness and vegetation period in forage pea (Pisum sativum L.) and estimation of general and specific combining ability effects. The genotypes used in the present study were Kerpo, Pleven 10, Mir and EFB33. The results of the analysis of combinative ability of the investigated traits showed influence of additive gene actions. The Vr/Wr graphs confirm the previous analysis that these traits were controlled by partial dominance. Kerpo was found to be the best general combiner for earliness (-30.06) and short duration of the vegetation period (-30.68). On the contrary, Pleven 10 exhibited highly negative combinative ability for both traits (13.06; 12.06). For decrease of the duration of periods days to beginning of flowering and technical maturity perspective crosses with high negative SCA effect were P 2 × P 3 (-10.56; -9.56) and P 1 × P 3 (-7.31; -9.31). Partial dominance and additive gene actions were observed for both traits. The fraction of h 2 /H 2 indicated that at least one-two groups of genes controlled dominance for these characters. Mir, Pleven 10 and E.F.B.33 were found as genotypes with exhibited dominant alleles, but with recessive alleles Kerpo. Broad and narrow sense heritability were ranged from moderate to high for the studied traits. The parental form used in the present study Kerpo possessed favorable genes for the studied traits, which could be utilized in the breeding programs designed to improve these triats of the forage pea.

Agro Morphological Characterization and Diversity Assessment of Pea (Pisum Sativum L.) Germplasm Conserved in Genebank of Nepal

“…The genotypes which take lesser number of days to emergence usually mature earlier. Monpara and Dhameliya (2013) and Kosev (2013) reported that early maturing traits play vital role in the adaptation of genotype to environments and cropping systems and have positive impact on yield. The mean Shannon-Weaver diversity indices (H') for quantitative characters is 0.783 which is relatively higher than thequalitative characters with 0.536.…”