PJB-2009-236
MODULATION IN GROWTH, SOME PHYSIOLOGICAL ATTRIBUTES AND FIBRE QUALITY IN UPLAND COTTON (GOSSYPIUM HIRSUTUM L.) DUE TO FREGO BRACT MUTATION
SAMINA MALIK1*, MUHAMMAD ASHRAF1, MUHAMMAD SHAHBAZ1 AND TANWIR AHMAD MALIK2
Abstract
Frego bract is a mutant type of floral bract in upland cotton. It is an important insect resistant trait; however, some reports in the literature show that frego bract gene has some negative effects on growth and fibre quality of cotton. In order to assess the role of frego bract trait on growth and photosynthesis, a pot experiment was carried out under glasshouse conditions to compare frego bract and normal bract recombinant cotton lines. The characteristics examined were: gas exchange, number of days from flower to boll opening and the traits related to fibre yield and fibre quality. Random Amplified Polymorphic DNA (RAPD) analysis was also conducted. The results revealed that the frego bract and normal bract lines had different genetic combinations. Bract type had a significant positive correlation with fibre strength. Frego bract gene had no negative effect on net photosynthesis, number of bolls per plant, boll weight, number of days from flower to boll opening, plant height, ginning out-turn and fibre quality. This shows that the frego bract gene segregates independently of the traits of agronomic importance, so this trait may easily be incorporated into commercial cotton varieties by simple breeding techniques.
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