Genome DNA content and chromosome organization in Gossypium |
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| Authors: | Dr. G. A. Edwards J. E. Endrizzi R. Stein |
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| Affiliation: | 1. Committee of Genetics and Departments of Agronomy and Plant Genetics and Mathematics, University of Arizona, Tucson
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| Abstract: | The ascending genome size in Gossypium is assumed to be D, A, B, E and F, and C. Feulgen cytophotometry revealed that mean value of DNA content for each genome was D= 10.95, B = 13.88, F = 14.31, E = 18.24, A = 18.66, and C = 20.30, and that there is a close relationship of genomic chromosome size and DNA content. Evidence suggests that the five genomes with large chromosomes arose from a D genome-like progenetor by large scale, saltatory replication of repetitive DNA distributed uniformly through the ancestral genome. Corresponding adjustment in recombination units did not accompany the two-fold divergence in DNA value of the two homoeologous A and D genomes in the allotetraploid species. |
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