Isolating Mechanisms in Hybrids of Gossypium Gossypioides

Menzel, M.Y.; Brown, M.S.

American Journal of Botany 42(1): 49-57


ISSN/ISBN: 0002-9122
DOI: 10.1002/j.1537-2197.1955.tb11093.x
Accession: 066842137

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Hybrids of the American wild diploid species G. gossypioides with two other American wild diploids, G. thurberi and G. raimondii, and with the two American amphidiploids, provide examples of several mechanisms which could serve to isolate species, including hybrid incompatibility, different responses to day length, and sterility and asynapsis in F1. Hybrids with G. thurberi die in the cotyledon stage; those with (G. raimondii are viable but sterile, though showing normal metaphase pairing. Hybrids with G. hirsutum give 13 n, 13 I at M I, are day neutral, and after several months develop stem necrosis and die. Hybrids with G. barbadense show hybrid vigor, sensitivity to day length, and a high degree of asynapsis at M I but are slightly fertile despite being triploid. Evidence is presented that genic factors are responsible for the differential behavior of G. gossypioides in the hybrids studied.