Variability studies in F3 Populations of Sun flower
Two populations in F3 generation developed from cross between low oleic inbreds (COSF 1B and TNHSF 239-61-2-2-1) and high oleic (HO 5-13) inbred were studied to assess genetic variability among oil yield and its component traits. High PCV and GCV were recorded for oil yield and single plant yield in F3 population of COSF 1B x HO 5-13. Similarly, high PCV was also noticed for oil yield and single plant yield in F3 population of TNHSF 239-61-2-4-1 x HO 5-13. This revealed the presence of substantial magnitude of genetic variability in the experimental material and better scope for improvement of these traits. High heritability (˃60%) coupled with high genetic advance as per cent of mean (˃20%) was recorded by the traits viz. plant height, 100- seed weight, single plant yield, oleic acid content and oil yield in both populations. Non-significant skewness and kurtosis were observed for most of the oil yield contributing traits in both the populations indicating that the genotypes in the population exhibited normal distribution for the traits under study. Highly heritable characters viz. plant height, 100- seed weight, volume weight, single plant yield and oil yield could be improved through individual plant selection in subsequent generations. Hence selection based on these characters would contribute for the improvement of oil yield in sunflower.
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