LOCALIZATION AND MAPPING OF THE LE(1) AND GL(2) LOCI OF COTTON (GOSSYPIUM-HIRSUTUM L)
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At least nine gene loci that affect several important traits have been localized to chromosome 12 of cotton (Gossypium hirsutum L, 2n = 4x = 52), more than to any other cotton chromosome. The genetic map of chromosome 12 remains incomplete and fragmented, so its improvement is desirable. We report results of monotelodisomic tests that allow unequivocal assignment of the hybrid lethality locus Le1 and the gossypol glanding locus Gl2 to the long arm of chromosome 12. Backcross progenies from euploid and montelodisomic F1 plants wereprogeny-tested to determine their genotypes at Le1, Le2, Gl2, and Gl3 loci, where the Le2 and Gl3 loci of chromosome 26 are homoeologous to the chromosome 12 loci. Classification of the testcross progeny revealed that the Le1 and Gl2 loci are arranged in the order centromere-Le1-Gl2, and indicated that the two genes are 13.2 5.5 cM and 32.4 7.7 cM from the centromere, respectively. The results are integrated with other mapping information for chromosomes 12 and 26, for which revised maps are presented. Currently available information indicates that Ne1, Lf, Le1, N1, Ms11, Gl2, Bw1, and Pgm7 are located in the long arm and that, of the gene loci localized to chromosome 12, only Ms8 resides in the short arm. 1994 The American Genetic Association.
