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Inheritance of the H 1 , H 2 , and Sm 2 Genes in Cotton 1
Author(s) -
Endrizzi J. E.,
Ramsay G.
Publication year - 1983
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1983.0011183x002300030002x
Subject(s) - biology , gene , genetics , centromere , chromosome , allele , trichome , gossypium , inheritance (genetic algorithm) , gene mapping , botany
Based on early genetic studies of inter‐ and intra‐specitlc crosses in cotton, the genes for increased plant pubescence, H 1 and H 2 are independently inherited. More recent studies with aneuploids of Gossypium hirsutum L. showed that the H 1 and H 2 genes and the Sm 2 gene (that removes trichomes from the plant) all are located on chromosome 6, and that the H 2 and Sm 2 are located in the long arm of the chromosome. The H 2 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 H 1 and Sm 2 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 F 2 populations of the three crosses of H 1 ✕ H 2 , H 1 ✕ Sm 2 , and Sm 2 ✕ H 2 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.