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Recombination between Supposedly Homologous Chromosomes of Gossypium Barbadense L. and G. Hirsutum L



Recombination between Supposedly Homologous Chromosomes of Gossypium Barbadense L. and G. Hirsutum L



Genetics 46(11): 1483-1500



Two supposedly homologous chromosomes of G. barbadense L. and G. hirsutum L. (Upland cotton) are shown to differ by a non-homologous terminal segment. In the non-homologous region crossing over is reduced from 20 to 8%, but the reduction is compensated by slight but general increases in other marked segments of the chromosome. As a result, total map length remains virtually unchanged. The compensatory mechanism appears to be similar to that found in corn, where the reduction of crossing over in inverted regions is accompanied by increases in the immediately proximal regions. Cotton differs from corn in the fact that "compensation" is absorbed over most of the chromosomal arm and is not restricted to the immediately proximal region. It is pointed out that somatic instability and reversal of dominance in neighboring loci appear to be associated in some way with the lack of homology.

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Accession: 014163219

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PMID: 17248075


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