Inheritance of drought resistance, yield and quality parameters in cotton (Gossypium hirsutum L.)

This study was done between 2009-2010 at Department of Field Crops, Institute of Natural and Applied Sciences of Çukurova University for investigation of F1 hybrid vigor, determination of the best parents and hybrid combinations and investigation genetic behavior under stress, optimum and combined conditions of 6 populations belonged to Gossypium hirsutum L. cotton genotypes (Beyaz Altın Mig 119, Sure Grow 125, Beyaz Altın 151, TamCot 22, TamCot Sphinx and Siokra L-22) which are distinguished by obtained by the half-diallel mating design and selected for adaptation ability and drought tolerance at our previos studies.Based on the ratio of general combining ability?s variance to specific combining ability?s variance, additive gene effects on monopodial branches, boll number, plant node number, boll seed cotton weight, seed cotton yield, earlines rate, gin turn-out efficiency, shedding ratio, leaf water content, stomatal conductance, fiber length, fiber strength under stress; optimum and combined conditions, non-additive gene effects on plant height and 100 seed weight.From the inspected 15 characteristics, 7 for BA 119xSG 125 hybrid was showed positive specific combining ability effects, heterosis and heterobeltiosis under stress conditions, 10 for under optimum and combined conditions; BA 119xTC 22 hybrid was showed positive specific combining ability effects, heterosis and heterobeltiosis for 5 traits under stress conditions, 10 traits under optimum and combined conditions; SG 125xTC Sphinx hybrid was showed positive specific combining ability effects, heterosis and heterobeltiosis for 6 traits under stress conditions, 9 traits under optimum and combined conditions; BA 151xTC Sphinx hybrid was showed positive specific combining ability effects, heterosis and heterobeltiosis for 7 traits under stress conditions, 5 traits under optimum contions and 9 traits under combined conditions. Therefore, the mentioned hybrids were determined as the potential hybrids that can be used at breeding studies for improvement of these traits.