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Incipient genome differentiation in gossypium part 1 chromosomes 14 15 16 19 and 20 assessed in gossypium hirsutum gossypium raimondii and gossypium lobatum by means of 7 a d translocations

Incipient genome differentiation in gossypium part 1 chromosomes 14 15 16 19 and 20 assessed in gossypium hirsutum gossypium raimondii and gossypium lobatum by means of 7 a d translocations

Genetics 90(1): 133-150

ISSN/ISBN: 0016-6731

The genus Gossypium is favorable for study of genome divergence at several levels. Early stages of divergence were studied among 4 D genomes by comparing chiasma frequencies (reciprocal exchanges) between pairs of genomes and between individual counterpart chromosomes marked by heterozygous translocations. D5 (G. raimondii) shows barely detectable differentiation from Dh (G. hirsutum), whereas D7 (G. lobatum) is considerably less closely related to Dh than is D5. Fragmentary data suggest that D2-2 (G. harknessii) falls between D5 and D7 in its relationship to Dh. Chiasma frequencies in individual chromosomes and marked regions exhibit the same order of relationships as their corresponding whole genomes indicating that the genome differentiation is generalized (i.e., nucleus-wide) rather than localized in specific chromosomes or chromosome regions. Estimates of relationships based on reciprocal exchange frequencies agree with those based on preferential synapsis in allohexaploids reported previously. Preferential synapsis and reciprocal exchange frequencies reveal the same order of relationships; to some extent they reflect common underlying changes in chromosome properties, despite recent evidence that synapsis and crossing over are under independent genetic control.

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Accession: 005659812

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