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

Thursday, January 5, 2012: 11:30 AM
Crystal Ballroom C (Orlando World Center Marriott)
V. A. Avtonomov , The Uzbek Scientific Research Institute of Selection and Cotton Seed-Production
Robert D. Stipanovic , USDA-ARS-Southern Plains Agricultural Research Center
A. A. Bell , USDA-ARS-Southern Plains Agricultural Research Center
O. H. Kimsanbaev , The Uzbek Scientific Research Institute of Selection and Cotton Seed-Production
Shadman Namazov , The Uzbek Scientific Research Institute of Cotton Breeding and Seed Production
U. K. Qayumov , The Uzbek Scientific Research Institute of Selection and Cotton Seed-Production
Sh. B. Amanturdiev , The Uzbek Scientific Research Institute of Selection and Cotton Seed-Production
G. X. Aziziva , The Uzbek Scientific Research Institute of Selection and Cotton Seed-Production
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.