Geographic and taxonomic distribution of anthocyanin genes in New World cottons
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Patterns of anthocyanin development in the vegetative and floral parts of New World cotton species are determined by the actions and interactions of two genetic loci with a minimum of three alleles in each:R 1,R 1 D ,r 1, andR 2 v ,R 2,r 2. The most frequent genotypic combinations are:r 1 r 1 R 2,R 2 andr 1 r 1 r 2 r 2. A survey of the geographical and taxonomic distribution of anthocyanin genes in living collections from Latin America provides the following information:R 1 is a rare mutant, restricted in nature to one race ofhirsutum (Gossypium hirsutum racelatifolium Hutchinson) and is localized in southwest Mexico.R 2 v , on the contrary is widely distributed in Latin America, through the Caribbean region of South America, the Guianas and the West Indies. It has not been found in Central America. The gene is shared by two species which are sympatric over a major part of their ranges—G. barbadense L. (including var.brasiliense)and G. hirsutum racemarie-galante Hutchinson.R 2 (Petal Spot) is common toG. barbadense andG. hirsutum, its frequency varies in the different races of the latter species.
KeywordsUpland Cotton Taxonomic Distribution Regional Collection World Cotton Anthocyanin Gene
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