Zeitschrift für Vererbungslehre

, Volume 92, Issue 3, pp 213–232 | Cite as

Non-disjunction in presence of interchanges involving B-type chromosomes in maize, and some phenotypical consequences of meaning in maize breeding

  • A. Bianchi
  • G. Bellini
  • M. Contin
  • E. Ottaviano


By using appropriately interchanges between A and B chromosomes in maize it has been possible to reach the following conclusions, chiefly on the basis of genetical experiments:
  1. 1.

    non-disjunction of BA chromosomes in the second microspore mitosis is greatly influenced by environmental conditions;

  2. 2.

    different BA chromosomes undergo different rates of non-disjunction: B10, B4 and B9 chromosomes show, under the same field conditions, decreasing values of such event;

  3. 3.

    following non-disjunction in the above mentioned mitosis, the “directed fertilization”, that is the tendency of the hyperploid sperm to unite with the egg nucleus rather than with the polar nuclei, is greater for B4 and B10, as compared with B9;

  4. 4.

    while non-disjunction in the mentioned mitosis may occur in 70% of the generative nucleus of microspore or more; according to genotype and environmental conditions, as mentioned above, the same phenomenon, although at a very much lower rate, does occur both in endosperm and sporophyte tissues;

  5. 5.

    the presence in the nucleus of B chromatin may not only result in nondisjunction of BA chromosomes, but also may cause non-disjunction of other A chromosomes;

  6. 6.

    kernels differing in BA chromosome endowment may greatly differ in endosperm size, as well as in the size of the plant derived from them;

  7. 7.

    the points (5) and (6) are specifically discussed respectively from the point of view of basic mechanisms of genetic control of nuclear behavior and of application in maize breeding.



Maize Field Condition Genetic Control Basic Mechanism Phenotypical Consequence 
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  1. Bianchi, A.: Mitotic disjunction and non-disjunction in the case of interchanges involving the B-type chromosomes. Maize Gen. Coop. News Letter31, 41–42 (1957a).Google Scholar
  2. —: Defective caryopsis factors from maize teosinte derivatives. I. Origin, description and segregation. Genetica Agraria7, 1–38 (1957b).Google Scholar
  3. —: Le traslocazioni fra cromosomi A e cromosomi B nel mais: loro uso nello studio della mutabilità. Genetica Agraria12, 337–354 (1960).Google Scholar
  4. Bianchi, A., andM. Contin: The use of interchanges involving A and B chromosomes in studying artificial mutagenesis in maize. Report presented at the Symposium on the effects of ionizing radiations on seeds and their significance for crop improvement. Karlsruhe, August 1960 (in press).Google Scholar
  5. Blackwood, M.: The inheritance of B chromosomes inZea mays. Heredity10, 353–366 (1956).Google Scholar
  6. Darlington, C. D.: Chromosome botany. London: Allen and Unwin (1956).Google Scholar
  7. —, andM. Upcott: The activity of inert chromosomes inZea mays. J. Genet.41, 275–296 (1941).Google Scholar
  8. Emerson, R. A., G. W. Beadle andC. Fraser: A summary of linkage studies in maize. Cornell Univ. Agric. exp. Sta. Mem.180, 1–83 (1935).Google Scholar
  9. Emmerling, M. H.: Evidence of non-disjunction of abnormal chromosome 10. J. Hered.49, 203–207 (1958).Google Scholar
  10. —: Preferential segregation of structurally modified chromosome in maize. Genetics44, 625–645 (1959).Google Scholar
  11. McClintock, B.: Chromosome organization and genic expression. Cold Spr. Harb. Symp. quant. Biol.16, 13–47 (1951).Google Scholar
  12. Randolph, L. F.: Genetic characteristics of the B chromosomes in maize. Genetics26, 606–631 (1941).Google Scholar
  13. Rhoades, M. M.: Preferential segregation in maize, “Heterosis”, p. 60–80. Ames: Jova St. Coll. Press (1952).Google Scholar
  14. —: The cytogenetics of maize. In: Corn and corn improvement, p. 123–219. New York: Academic Press (1955).Google Scholar
  15. Roman, H.: Mitotic non-disjunction in the case of interchanges involving the B-type chromosome in maize. Genetics32, 391–409 (1947).Google Scholar
  16. —: Directed fertilization in maize. Proc. nat. Acad. Sci. (Wash.)32, 36–42 (1948).Google Scholar
  17. —: Factors affecting mitotic non-disjunction in maize. Records Genetics Soc. Amer.18, 112 (1949).Google Scholar
  18. —, andA. J. Ullstrup: The use of A-B translocations to locate genes in maize. Agron J.43, 450–454 (1951).Google Scholar
  19. Ting, Y. C.: On the origin of abnormal chromosome 10 in maize (Zea mays L.). Chromosoma (Berl.)9, 286–291 (1958).Google Scholar

Copyright information

© Springer-Verlag 1961

Authors and Affiliations

  • A. Bianchi
    • 1
  • G. Bellini
    • 1
  • M. Contin
    • 1
  • E. Ottaviano
    • 1
  1. 1.Institute of GeneticsThe University of MilanoMilanoItalia

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