PJB-2008-179
INHERITANCE OF FREGO BRACT AND ITS LINKAGE WITH FIBRE AND SEED TRAITS IN COTTON
SAJID-UR-RAHMAN1, TANWIR AHMAD MALIK 2, M. ASHRAF3 AND SAMINA MALIK3
Abstract
Narrow and twisting flower bract exists in addition to normal broad bract in cotton germplasm which has been named as frego bract. In this bract type, bracteole is reduced; hence do not provide shelter to eggs/nymphs of insects and has been reported to provide resistance against some insect pests like bollworms and boll weevil. Inheritance of this trait was studied by crossing normal and frego bract genotypes. In the F2 population normal bract and frego bract plants were in the ratio of 3:1 showing monogenic inheritance of the trait, frego bract being recessive. The test cross ratio of 1:1 confirmed the monogenic inheritance. The F2 population was used to study linkage relationship of frego bract with fibre (staple length, fibre fineness, fibre strength) and seed traits (ginning out turn, seed index and seed volume). There was positive correlation of bract type with fibre strength (normal bract allele and alleles for strong fibre seemed to be on the same chromosome). The absence of correlation of the gene for frego bract with the other traits, shows that it segregates independently in relation to those traits. Hence frego bract type plants may be tailored with good combination of agronomic traits.
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