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Combining ability and heterosis were determined in a population obtained from the half diallel crossing of 6 different cotton genotypes for yield components and fiber quality parameters. | Turk J Agric For 27 (2003) 207-212 © TÜB‹TAK Heterosis and Combining Ability for Yield Components and Fiber Quality Parameters in a Half Diallel Cotton (G. hirsutum L.) Population1 Hüseyin BAfiAL*, ‹smail TURGUT Adnan Menderes University, Faculty of Agriculture, Department of Crop Science, Ayd›n -TURKEY Received: 20.05.2003 Abstract: Combining ability and heterosis were determined in a population obtained from the half diallel crossing of 6 different cotton genotypes for yield components and fiber quality parameters. For breeding purposes, to improve the investigated characters some suitable parents were selected for different characters: DPL 5690 for number of bolls per plant, Acala SJ-5 for boll weight and fiber length; Nazilli-84 and Carmen for seed cotton yield and lint percentage; Tamcot CAMD-E for earliness and fiber fineness; and PD 6168 for fiber strength. When the crosses were evaluated for the investigated characters Tamcot CAMD-E x Carmen, Nazilli84 x PD 6168, DPL 5690 x Tamcot CAMD-E and Tamcot CAMD-E x PD 6168 are considered promising combinations for further research. It was concluded that applying 3-way crosses, or modified backcross or recurrent selection to genotypes having good combining ability would improve yield and fiber quality. Key Words: Cotton, diallel analyses, heterosis, general and specific combining ability Yar›m Diallel Pamuk (G. hirsutum L.) Populasyonunda Verim Komponentleri ve Lif Kalite Özelliklerinin Heterosis ve Uyuflma Yetenekleri Özet: Alt› farkl› pamuk çeflidinin yar›m diallel melezlenmesiyle oluflturulan populasyonunda verim komponentleri ve lif özellikleri yönünden uyuflma yetenekleri ve heterosis de¤erleri saptanm›flt›r. Ele al›nan özelliklerin gelifltirilebilmesine yönelik olarak yap›lacak ›slah çal›flmalar› bak›m›ndan, bitkide koza say›s› için DPL 5690; koza kütlü pamuk a¤›rl›¤› ve lif uzunlu¤u için Acala SJ-5; bitki kütlü pamuk verimi ve ç›rç›r rand›man› için Nazilli-84 ve Carmen; erkencilik oran› ve lif inceli¤i .
