Inheritance, Heritability and Variability of Tolerance to Verticillium Dahliae Kleb Among Geographically Remote F1-F2 Hybrids of Gossypium Hirsutum L

One of the most important problems for cotton breeding in Uzbekistan is development of Verticillium dahliae tolerant varieties.  One approach is to utilize ecologically remote intraspecific and interspecific hybridization with local commercial cultivars.  To this end, we have conducted genetically based selection research to determine heritability and variability of wilt tolerance of geographically remote hybrids.  Our research shows intermediate inheritance and overdominance of resistance to V. dahliae in F₁ hybrids.  The observed coefficients of dominancy (hp) F₁ and inheritance (h) of V. dahliae tolerance among F₂ populations has allowed us to identify useful F₁ hybrids and F₂ plants.  Inheritance data of V. dahliae tolerance ranges between 0.92 and 0.97 shows a high inheritance of the resistant trait and allows selection of tolerant plants in F₂ generations.  Based on these studies we recommend the varieties Karmen and Flora, which are of Turkish origin, as breeding stock for tolerance to V. dahliae Klebhan.