ARS | Publication request: Inheritance and variability of tolerance to Verticillium dahliae Kleb amoung geographically remote F1-F2 hybrids of Gossypium hirsutum L.

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: November 3, 2011
Publication Date: January 5, 2012
Citation: Avtonomov, V., Stipanovic, R.D., Bell, A.A., Kimsanbaev, O., Namazov, S., Qayumov, U., Amanturdiev, S., Aziziva, G. 2012. Inheritance and variability of tolerance to Verticillium dahliae Kleb amoung geographically remote F1-F2 hybrids of Gossypium hirsutum L. [Abstract]. Proceedings of the Beltwide Cotton Conferences, January 3-6, 2012, Orlando, Florida. p. 13034.

Technical Abstract: 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 and 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.