, Volume 39, Issue 1, pp 75–81 | Cite as

The influence of B-chromosomes on chiasma frequencies in Black Mexican Sweet Corn

  • U. Ayonoadu
  • H. Rees


The mean chiasma frequency at first metaphase of meiosis in pollen mother cells of a maize variety, Black Mexican Sweet Corn, increases with increasing number ofB-chromosomes. The increased chiasma frequency is also reflected by a decrease in the number of rod bivalents at first metaphase.

There is some indication that theB-chromosomes also influence the distribution of chiasmata between pollen mother cells.

The increase in chiasma frequency due toBs is closely analogous to the increase in crossing-over carlier attributed toBs between marker genes located on chromosome III. Together the evidence confirm the role ofBs in controlling genetic recombination at meiosis.


Marker Gene Mother Cell Pollen Mother Cell Genetic Recombination Maize Variety 
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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  1. Bosemark, N. O. (1957). On accessory chromosomes inFostuca pratensis V. Influence of accessory chromosomes on fertility and vegetative development.Hereditas 43: 211–235.Google Scholar
  2. Cameron, F. M. & H. Rees (1967). The influence ofB chromosomes on meiosis inLolium.Heredity 22: 446–450.Google Scholar
  3. Darlington, C. D. (1934). The origin and behaviour of chiasmata III.Zea mays.Zeitschr. ind. Absl. Vererbungsl. 67: 96–114.Google Scholar
  4. Darlington, C. D. (1956). Chromosome Botany. Allen and Unwin. London.Google Scholar
  5. Frost, S. (1958). Studies on the genetical effects of accessory chromosomes inCentaurea scabiosa.Hereditas 44: 112–122.Google Scholar
  6. Hanson, G. P. (1961). Alteration of recombination frequencies inA- byB-chromosomes.Maize-Genetics Co-operation Newsletter 35: 61.Google Scholar
  7. Hanson, G. P. (1962). Crossing-over in Chromosome III as influenced byB-chromosomes.Maize-Genetics Co-operation Newsletter 36: 34.Google Scholar
  8. John, B. & G. M. Hewitt (1965). TheB chromosome system ofMyrmeleotettix maculatus [Thunb.] I. Mechanics.Chromosoma 16: 548–578.PubMedGoogle Scholar
  9. Jones, R. N. & H. Rees (1967). Genotypic control of chromosome behaviour in rye. XI. The influence ofB chromosomes upon meiosis.Heredity 22: 333–347.Google Scholar
  10. Lewis, H. (1951). The origin of supernumerary chromosomes in natural populations ofClarkia elegans.Evolution 5: 142–157.Google Scholar
  11. Lewis, K. R. & E. John. (1963). Chromosome Marker. Churchill, London.Google Scholar
  12. Melander, Y. (1950). Accessory chromosomes in animals especiallyPolycelis tenuis.Hereditas 36: 19.Google Scholar
  13. Moss, J. P. (1966). The adaptive significance ofB-chromosomes in rye.Chromosomes Today I: 15–23.Google Scholar
  14. Müntzing, A. (1943). Genetical effects of duplicated fragment chromosomes in rye.Hereditas 29: 91–112.Google Scholar
  15. Müntzing, A. (1954). Cytogenetics of accessory chromosomes (B-chromosomes).Proc. 9th Int. Cong. Genet. 282–301.Google Scholar
  16. Müntzing, A. (1963). The effects of accessory chromosomes in diploid and tetraploid rye.Hereditas 49: 371–426.Google Scholar
  17. Randolph, L. F. (1941). Genetic characteristics ofB chromosomes in maize.Genetics 26: 608–631.Google Scholar
  18. Rhoades, M. M. (1950). Meiosis in maize.Jour. Heredity 41: 59–61.Google Scholar
  19. Vosa, C. G. (1966). Seed germination andB chromosomes in the leek (Allium porrum).Chromosomes Today I: 24–27.Google Scholar

Copyright information

© Martinus Nijhoff 1968

Authors and Affiliations

  • U. Ayonoadu
    • 1
  • H. Rees
    • 1
  1. 1.Department of Agricultural BotanyUniversity College of WalesAberystwythUK

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