CCS Haryana Agricultural University, Hisar 125 004
In okra, inheritance of resistance to leafhopper was investigated in 2 resistant × susceptible crosses using 6 standard generations, viz. parents, F1 F2 and first back crosses. Leafhopper nymphal population and injury index were recorded. An additive dominance model fitted the data adequately. Both additive and dominant gene effects were found significant in explaining the inheritance of these traits. There was no evidence of epistasis. To improve leafhopper resistance in commercially grown varieties of okra, back cross method is recommended. However, selection for resistant genes in later generations may also be exercised until the homozygosity is achieved.
