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The nature and behaviour of supernumerary chromosomes in the rhizirideum group of the genus Allium

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Abstract

Individuals at various levels of ploidy in three species of Allium (angulosum, nutans and senescens) contain a morphologically uniform B-chromosome. This supernumerary is different in character from other B-types recorded for the genus. In diploids the B divides at second anaphase so that 50% of the pollen grains transmit it. The level of transmission is lower in the pollen of polyploids and still lower on the female side where pre-meiotic elimination occurs in both diploids and polyploids. Despite this, and although no effect of the B could be discerned on germination, all plants examined possessed the B-chromosome.

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Authors and Affiliations

  1. Department of Botany, Faculty of Natural and Mathematical Sciences, Skopje, Yugoslavia

    Milka Shopova

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  1. Milka Shopova
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Additional information

This paper was prepared in the Department of Genetics, University of Birmingham while the author was a recipient of a British Council Scholarship.

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Shopova, M. The nature and behaviour of supernumerary chromosomes in the rhizirideum group of the genus Allium. Chromosoma 19, 149–158 (1966). https://doi.org/10.1007/BF00293680

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  • DOI: https://doi.org/10.1007/BF00293680

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