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Chromosome behaviour in the Aloineae

I. The nature and significance of E-type bridges

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Abstract

An E-type bridge is formed at AI of meiosis by a proximal connection between the long arm of an acrooentric chromosome and the short arm of its homologue. A long acentric fragment is also produced, consisting of an erstwhile long and short arm. Heteromorphy of homologues indicates that the bridge is formed as a result of crossing over in a non-inverted segment of chromosome translocated from one arm to the other by successive paracentric and pericentric inversions. There is no evidence that translocated centromere regions pair. E-type bridges occur in the Aloineae (Liliaceae) in 20 out of 163 taxa studied. It is suggested that a high incidence of E-type bridges is indicative of inter-specific hybridity.

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  1. Jodrell Laboratory, Royal Botanic Gardens, Kew

    P. E. Brandham

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  1. P. E. Brandham
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Brandham, P.E. Chromosome behaviour in the Aloineae . Chromosoma 27, 201–215 (1969). https://doi.org/10.1007/BF00326145

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  • DOI: https://doi.org/10.1007/BF00326145

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