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The Journal of Heredity 1985:76(3):191-193
© 1985 The American Genetic Association 76:191-193

research-article

Metaphase I centromere coorientation in interchange heterozygotes of Triticum aestivum L.

Araceli Fominaya, and Nicolás Jouve

The authors are affiliated with the Department of Genetics of the Faculty of Sciences of the University of Alcalá de Henares, Apdo. 20, Alcalá de Henares (Madrid), Spain. They wish to thank Professor Enrique Sánchez-Monge for much useful advice and critical comment, and the Comision Asesora de Investigación Cientifica y Técnica of Spain for grant 1558–82 to support this work. Please address reprint requests to Dr. Jouve.

Abstract

The meiotic disjunction at metaphase I of a ring-of-four quadrivalent in symmetrical structural heterozygotes of Triticum aestivum L. involving chromosomes 3D and 4D has been analyzed using the C-banding staining technique. Four types of disjunction (adjacent-1, adjacent-2, alternate-1, and alternate-2) with different frequencies were found, with alternates more frequent than adjacents and adjacent-1 more frequent than adjacent-2. The two types of alternate coorientations appeared with similar frequencies. Some metaphase I cells showed an "ambiguous" or zig-zag, three-dimensional type of alternate disjunction. The basis for the claim or rejection that two types of alternate disjunction can exist is discussed.


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