Abstract
The objective of this study was to investigate the general combining ability effects of parents and specific combining ability effects of crosses under normal and water deficit condition for various traits related to fibre quality. For this purpose, 50 F1 crosses and their 15 parents was field planted under two different moisture regimes i.e. normal and water deficit condition in the experimental area of Department of Plant Breeding and Genetics, UAF. Analysis of variance under normal and drought condition revealed that genotypes showed highly significant differences for all the traits under both conditions. For most of fibre quality traits, under normal condition, among the lines, the good general combiners were IUB-212 and FH-113 and poor general combiners were VH-295 and NS-121. Among the testers, the good general combiners were IR-3, CIM-443 and S-12 and poor general combiners were MNH-147 and FH-1000. Under the drought condition, among the lines, the good general combiner was IUB-212 and poor general combiners were VH-295 and FH-142. Among the testers, the good general combiner was S-12 and poor general combiners were MNH-147 and IR-3. For most of fibre quality traits the best specific combiner were VH-144 × CIM-443 and AA-802 × S-12 under normal condition while under drought condition the best specific combiner were VH-144 × CIM-443, VH-295 × IR-3, VH-144 × FH-1000 and VH-295 × CIM-443. The variance due to specific combining ability was greater as compared to the general combining ability variance for all the traits indicating the dominant role of non-additive genes under normal and drought condition. The crosses VH-144 × CIM-443 and VH-295 × IR-3 can be used in variety development program for drought prone areas of Pakistan with high specific combining ability for fibre quality traits under drought condition. All fibre quality traits having non-additive gene action suggested usage of this material in the hybrid development programme in cotton.

Aziz Ullah, Amir Shakeel, Tanwir Ahmad Malik, Muhammad Farrukh Saleem. (2019) COMBINING ABILITY ANALYSIS OF VARIOUS FIBRE QUALITY TRAITS UNDER NORMAL AND WATER DEFICIT CONDITION IN COTTON, , Volume 56, Issue 2.
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