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This article in CS

  1. Vol. 23 No. 3, p. 449-452
    Received: June 14, 1982

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Inheritance of the H1, H2, and Sm2 Genes in Cotton1

  1. J. E. Endrizzi and
  2. G. Ramsay2



Based on early genetic studies of inter- and intra-specitlc crosses in cotton, the genes for increased plant pubescence, H1 and H2 are independently inherited. More recent studies with aneuploids of Gossypium hirsutum L. showed that the H1 and H2 genes and the Sm2 gene (that removes trichomes from the plant) all are located on chromosome 6, and that the H2 and Sm2 are located in the long arm of the chromosome. The H2 gene was mapped 4 units from the centromere. Based on the latter data, the three genes may either be closely linked or alleles. In this study, we used aneuplolds to show that the H1 and Sm2 genes also are located 4 map units from the centromere in the long arm of chromosome 6. In addition to the cytogenetic approach, we also studied the F2 populations of the three crosses of H1H2, H1Sm2, and Sm2H2 and found that the three genes segregated as alleles. In view of these results, a revised nomenclature for the smooth-halriness genetlcal system in cotton is needed.

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