Heterosis for yield and yield contributing traits in sunflower (Helianthus annuus L.)
The main objective related to heterosis breeding is to improve the oil content and seed yield of newly developed
hybrids of sunflower (Helianthus annuus L.) using selected parental lines. The present experiment involved of four CMS lines and six testers which were crossed in line x tester fashion to estimate the heterosis for seed yield and yield contributing traits in sunflower. The resulting 24 hybrids were evaluated in two replications of randomized block design over two commercial checks LSFH-171 and LSFH-35 during Kharif 2018 at Oilseed Research Station, Latur. The morphological observations on ten quantitative characters were recorded. Range of standard heterosis in 24 hybrids over check, LSFH-171 ranged from -6.42 to 31.74, whereas the other check, LSFH-35 showed range from -13.56 to 13.56 for oil content while the extent of heterosis for seed yield in hybrid over LSFH-171 ranged from -20.51 to 37.18 while over the other check, LSFH-35 ranged from -6.06 to 62.12. Hybrid PET 89-1 x EC-601951 R exhibited a significant negative heterosis for early flowering and days to maturity over both checks. The hybrids viz., CMS 17 A X EC-601951 R, PET 89-1 x RHA-1-1 recorded a high significant heterosis in desirable direction over both standard checks, LSFH-171 and LSFH-35 for yield and yield contributing traits. These better performing hybrids can be used for exploiting hybrid vigour and needs to be evaluated in future sunflower breeding programme.
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