Combining ability and heterosis for fiber color and quality in cotton (Gossypium hirsutum L.)

The interest in organic cotton (colored) has been increased due to high contamination and environmental pollution during fabric dying process. However, detailed studies are needed to determine the genetic and yield related traits. Eight different cotton genotypes (3 green, 3 brown and 2 white) with known fiber color values were used in the current study to record combining ability and heterosis for fiber colour and quality traits. An 8x8 half diallelhybrid population containing 28 F-1 hybrids was analysed in the experimental area of GAP Agricultural Research Institute, anhurfa, Turkey. The study including parents and hybrids was established in a randomized complete block design with three replications. The main aim was to examine the genetic structure for studied traits in the populations developed and detecting F, hybrid vigour. Finding appropriate parent and hybrid combinations for breeding studies was the second major aim of the study. Sufficient variations were noted for the studied traits in hybrid population formed. Genetic parameters such as general and special compatibility abilities, heterosis and heterobeltiosis values were recorded in the formed population. Fiber length (mm), fiber fineness (micronaire), fiber strength (g tex(-1)), fiber uniformity (%), fiber color values L* (brightness), a* (red-greenness) and b* (yellow-blueness) values were recorded. It was noted that additive genetic effects were important for fiber length, fiber fineness, fiber strength, L*, a* and b* traits.