Heterosis in cms based hybrids of Pigeonpea (cajanus cajan (l.) Millsp.) uri icon

abstract

  • An investigation on heterosis in CMS based hybrids of pigeonpea (Cajanus cajan(L.) Millsp.) was carried out during kharif 2015 at International Crops Research Institutefor the Semi-Arid Tropics (ICRISAT), Patancheru with 24 hybrids and four checks toelicit the information on magnitude of the genetic variability, heritability, geneticadvance as per cent of mean, character association, path coefficient analysis, extent offertility restoration and heterosis. Observations were recorded on ten characters viz., daysto 50% flowering, days to maturity, plant height (cm), number of primary branches perplant, number of secondary branches per plant, number of pods per plant, pod weight perplant, 100 seed weight (g), grain yield per plant (g) and mean pollen fertility %.Analysis of variance showed significant differences among the hybrids for all thecharacters studied indicating a high degree of variability in the experimental material.The genotypic coefficients of variation for all the characters studied were lesser than thephenotypic coefficients of variation indicating the influence of environment onexpression of these traits. High genetic variability coupled with high heritability andgenetic advance as per cent of mean were recorded for number of primary branches perplant, number of secondary branches per plant and pollen fertility % indicating the roleof additive genes in governing the inheritance of these traits.The correlation study indicated that grain yield per plant was significantlyassociated with days to 50% flowering, days to maturity, number of primary branches,number of secondary branches, number of pods per plant and pod weight indicating theirimportance as selection criteria in pigeonpea yield improvement programmes.Path coefficient analysis revealed that pod weight per plant and number ofprimary branches had positive direct effects on seed yield per plant. Hence, these traitsshould be considered as important selection criteria in all yield improvementprogrammes and direct selection for these traits is recommended.Fertility restoration studies showed that 15 out of 24 hybrids recorded high (>80%) pollen fertility and exhibited better fertility restoration. Nine out of 13 male linesshowed fertility restoration of more than 80% and were classified as restorers forcorresponding CMS lines.The present investigation also revealed high levels of heterosis i.e. over 50% intraits like number of pods per plant, pod weight per plant and grain yield per plant. ICPH3762 and ICPH 4502, with high per se performance and high standard heterosis for grainyield per plant and for majority of yield attributes, were identified as promising hybrids

publication date

  • 2016