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Theoretical and Applied Genetics

, Volume 43, Issue 3–4, pp 139–146 | Cite as

Autotetraploid gene segregation

  • G. G. Doyle
Article

Summary

Autotetraploid gene segregation was studied in Zea mays L. using a marking system of two very closely linked genes (A1 and Sh2) in the repulsion phase. This system makes it possible to identify many euploid and aneuploid genotypes and enables the estimation of some parameters of autotetraploid gene segregation such as double reduction, numerical nondisjunction, and the relative transmission frequencies of monosomic, disomic, and trisomic gametes. It was found that these three types of gametes did not function at the same rates on the male and female sides. Differences in observed segregation ratios between reciprocal testcrosses were explained by this phenomenon. Estimates of the frequency of double reduction were made for loci used after eliminating the effect of numerical non-disjuction on the segregation ratios. The value of double reduction appears to be the same in the male and female tetrasomic tetraploid. Tetraploids which were disomic for chromosome 3 were not isolated although they might be expected to be common in the progeny of self-fertilized or sib-crossed trisomic tetraploids. Their absence may be explained in part by the low rate of transmission of monosomic gametes from the male parent. Autotetraploid populations which are unstable for chromosome number probably achieve an equilibrium between forces which produce aneuploidy and forces which remove aneuploids from the population.

Keywords

Chromosome Number Male Parent Segregation Ratio Female Side Transmission Frequency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Literature

  1. 1.
    Blakeslee, A. F., Belling, J., Farnham, M. E.: Inheritance in tetraploid Daturas. Bot. Gaz. 76, 319–373 (1923).Google Scholar
  2. 2.
    Burnham, C. R.: Discussions in Cytogenetics. Minneapolis: Burgess Publishing Co. 1962.Google Scholar
  3. 3.
    Catcheside, D. G.: Double reduction and numerical non-disjunction in maize. Heredity 10, 205–218 (1956).Google Scholar
  4. 4.
    Catcheside, D. G.: Segregation in tetraploid potatoes. Heredity 13, 403–407 (1959).Google Scholar
  5. 5.
    Doyle, G. G.: Preferential pairing in trisomics sof Zea mays. In: Chromosomes Today vol. 2, 12–20. Edinburgh: Oliver and Boyd 1969.Google Scholar
  6. 6.
    El-Ghawas, M. I.: A cytogenetic study of segregation in autotetraploid maize involving genes at different distances from the centromere. Ph. D. thesis Cornell University, Ithaca, N.Y. (1955).Google Scholar
  7. 7.
    Fisher, R. A., Mather, K.: The inheritance of style length in Tythrum salicaria. Ann. Eugenics 12, 1–23 (1943).Google Scholar
  8. 8.
    Gilles, A., Randolph, L. G.: Reduction of quadrivalent frequency in autotretraploid maize during a period of ten years. Amer. Jour. of Bot. 38, 12–17 (1951).Google Scholar
  9. 9.
    Haldane, J. B. S.: The theoretical genetics of autopolyploids. Jour Genetics 22, 259–272 (1930).Google Scholar
  10. 10.
    Kadam, B. S.: Chromosome studies in relation to fertility and vigor in inbred and open pollinated strains of autotetraploid maize. I. Behavior of 40-chromosome plants. Indian Jour. Genetics and Plant Breeding 4, 8–22 (1944).Google Scholar
  11. 11.
    Mather, K.: Reductional and equational separation of the chromosomes in bivalents and tetravalents. Jour. Genetics 30, 53–78 (1935).Google Scholar
  12. 12.
    Mather, K.: Segregation and linkage in autotetraploids. Jour. Genetics 32, 287–314 (1936).Google Scholar
  13. 13.
    Morrison, J. W.: Chromosome behavior and fertility of Tetra Petkus rye. Canadian Jour. of Agr. Sci. 36, 157 to 165 (1956).Google Scholar
  14. 14.
    Morrison, J. W., Rajhathy, T.: Frequency of quadrivalents in autotetraploid plants. Nature 187, 528–530 (1960).Google Scholar
  15. 15.
    Muller, H. J.: A new mode of segregation in Gregory's tetraploid primulas. Amer. Nat. 48, 508–512 (1914).Google Scholar
  16. 16.
    Randolph, L. F.: Cytogenetics of tetraploid maize. Jour. Agr. Research 50, 591–605 (1935).Google Scholar
  17. 17.
    Shaver, D. L.: A comparison of meiosis in perennial teosinte (4n), tetraploid maize and their hybrid. Caryologia 15, 53–57 (1962a).Google Scholar
  18. 18.
    Shaver, D. L.: A study of aneuploidy in autotetraploid maize. Canadian Jour. Genetics 4, 226–234 (1962b).Google Scholar
  19. 19.
    Weber, D. F.: The use of monosomy to detect genes altering recombination in Zea mays. Maize Genetic Cooperative News Letter 45, 32–35 (1971).Google Scholar

Copyright information

© Springer-Verlag 1973

Authors and Affiliations

  • G. G. Doyle
    • 1
  1. 1.U.S. Department of Agriculture and Agronomy Dept.University of MissouriColumbiaUSA

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