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Duplicated chromosome segments in maize (Zea mays L.): further evidence from hexokinase isozymes

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Summary

The genetic control of hexokinase isozymes (ATP: d-hexose-6-phosphotransferase, E.C. 2.7.7.1, HEX) in maize (Zea mays L.) was studied by starch gel electrophoresis. Genetic analysis of a large number of inbred lines and crosses indicates that the major isozymes observed are encoded by two nuclear loci, designated Hex1 and Hex2. Five active allozymes and one null variant are associated with Hex1, while Hex2 has nine active alleles in addition to a null variant. Alleles at both loci govern the presence of single bands, with no intragenic or intergenic heteromers visible, suggesting that maize HEX's are active as monomers. Organelle preparations demonstrate that the products of both loci are cytosolic. All alleles, including the nulls, segregate normally in crosses. Vigorous and fertile plants were synthesized that were homozygous for null alleles at both loci, suggesting that other hexosephosphorylating enzymes exist in maize that are undetected with our assay conditions. Linkage analyses and crosses with B-A translocation stocks place Hex1 on the short arm of chromosome 3, 27 centimorgans from Pgd2 (phosphogluconate dehydrogenase) and Hex2 on the long arm of chromosome 6, approximately 45 centimorgans from Pgd1. It is suggested that the parallel linkages among these two pairs of duplicated genes reflects an evolutionary history involving chromosome segment duplication or polyploidy.

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Author notes

  1. J. F. Wendel

    Present address: Department of Crop Science, North Carolina State University, 27695-7620, Raleigh, NC, USA

Authors and Affiliations

  1. Agricultural Research Service, USDA, and Department of Genetics, North Carolina State University, 27695-7614, Raleigh, NC, USA

    J. F. Wendel, C. W. Stuber, M. D. Edwards & M. M. Goodman

  2. Department of Botany, Bessey Hall, Iowa State University, 50011, Ames, IA, USA

    M. M. Goodman

Authors
  1. J. F. Wendel
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  2. C. W. Stuber
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  3. M. D. Edwards
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  4. M. M. Goodman
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Additional information

Communicated by A. R. Hallauer

Paper No. 10170 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC

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Wendel, J.F., Stuber, C.W., Edwards, M.D. et al. Duplicated chromosome segments in maize (Zea mays L.): further evidence from hexokinase isozymes. Theoret. Appl. Genetics 72, 178–185 (1986). https://doi.org/10.1007/BF00266990

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  • DOI: https://doi.org/10.1007/BF00266990

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