Abstract
Colchicine induced tetraploids (4x=28) from diploidSecale cereale heterozygous for a translocation showed a strong tendency of non-preferential pairing for the interchanged chromosomes. The normal chromosomes associated in configurations up to quadrivalents, and the translocation complex formed multivalents up to octavalents. Most of the interchanged chromosome associations were characterized by their heteromorphic nature. The percentage of the chromosomes in the interchange complex forming multivalent associations was far higher than that of the remaining twenty chromosomes. Abnormalities were observed at anaphase I and II in the pollen mother cells. The tetraploids appeared to be completely sterile. It is suggested that the high frequency of multivalent formation may be explained on the basis that the interchange might have involved a region of localized chiasmata. The absence of polyploidy in the genusSecale as against its widespread occurrence in the related grass genera may be accounted for, in part, on the basis of non-preferential pairing.
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Ahloowalia, B.S. Study of a translocation in tetraploid rye. Genetica 33, 207–221 (1963). https://doi.org/10.1007/BF01725762
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DOI: https://doi.org/10.1007/BF01725762