Abstract
In allotetraploid Gossypium species yellow petal is controlled by duplicate dominant genes Y1 (Ah genome) and Y2 (Dh genome), and open bud is controlled by duplicate recessive genes designated ob1 (Dh genome) and ob2 (Ah genome). Y2 and ob1 have been shown previously to be linked on chromosome 18 and 11.5 map units (MU) apart. In this study ob2 and Y1 were transferred from Gossypium darwinii (Watt) accession CB3099 into Gossypium hirsutum L. and found to have a mean recombination percentage of 3.14 for backcross and 3.40 for self-pollinated families from 2n parental heterozygotes and 10.73 in families from mono-18 parental heterozygotes. The lower recombination frequency in the homoeologous linkage group was perhaps due to this chromosome segment being transferred from G. darwinii. The higher frequency of recombination in the monosomic progeny families suggests that the absence of recombination in one homoeologue (chromosome 18) is compensated for by an increase in recombination in the other homoeologue.Key words: cotton, G. hirsutum L., homoeologous linkage groups, genetic markers.
Publisher
Canadian Science Publishing
Subject
Genetics,Molecular Biology,General Medicine,Biotechnology
Cited by
8 articles.
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