Assessment of genetic diversity in advanced breeding lines derived from intraspecific crosses of garden pea (Pisum sativum L.)

Abstract

An intraspecific hybrid breeding program involving six crosses, Palam Sumool (PS) × Palam Priya, PS × Pb-89, PS × Azad P-1, PS × Palam Triloki and VRPMR10 × Sugar Giant, Green Pearl × DPP-9411 was initiated in 2006 onwards followed by pedigree selection, resulted in isolation of 45 genotypes with desirable attributes. These progenies along with five recommended varieties were evaluated during 2014-15 to assess degree of divergence. A considerable genetic diversity was observed among genotypes, dispersed in 18 diverse clusters. Of these, 17 were monogenotypic while cluster I had maximum genotypes. Internodal length contributed maximum towards total genetic divergence followed by nodes per plant, protein content and average pod weight. Superior performing genotypes viz., ‘DPP-2011-SP-7’, ‘DPP-2011-SP-17’, and ‘DPP-2011-SP-24’ from cluster I and ‘DPP-2011-SP-6’, ‘DPP-2011-SP-22’ ‘DPPMR-09-1’, ‘DPPMR-09-2’, ‘DPP-2011-SN-5’ and ‘Palam Triloki’ from monogenotypic clusters offer promise for their direct use as varieties and as potential parents in future breeding programmes.