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Basis of the Diploid-like Meiotic Behaviour of Polyploid Cotton

Naturevolume 191pages98100 (1961) | Download Citation

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Abstract

THE cultivated cottons (Gossypium barbadense and G. hirsutum) are allotetraploids derived from two geographically isolated diploid species ; one, an Asiatic species, donating the A genome and the other, an American species, donating the D genome. The chromosomes of the diploid progenitors differ in length, those of the A genome species being longer than those of the D genome species. Furthermore, this size difference is maintained in the polyploid, in which chromosomes of two size-categories can be recognized. A histogram (Fig. 1) of the lengths of the somatic chromosomes from root-tips of seven plants of G. barbadense shows a bimodal distribution of the chromosome lengths and also indicates that there is a small overlap between the two groups.

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References

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  1. Plant Breeding Institute, Maris Lane, Trumpington, Cambridge

    • G. KIMBER

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https://doi.org/10.1038/191098a0

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