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Inversion heterozygosity and sub-chromatid exchange in Agave stricta

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Abstract

A plant of Agave stricta Salm. (2n=60) has a bimodal complement of 10 L, 4 M and 46 S chromosomes. It is heterozygous for a paracentric inversion which involves the middle third of the long arm of one of the L chromosomes. It produces at anaphase I bridges and fragments and also loops and fragments, both single and double. Breakage and reunion at the sub-chromatid and at the chromatid level produce side-arm bridges and bridges and fragments respectively at anaphase I. A method is given, based on chiasma frequency, which will in certain cases of inversion heterozygosity provide a reasonable estimate of the position and the length in genetic map units of an inverted segment with respect to the whole chromatid arm.

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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. Inversion heterozygosity and sub-chromatid exchange in Agave stricta . Chromosoma 26, 270–286 (1969). https://doi.org/10.1007/BF00326522

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  • DOI: https://doi.org/10.1007/BF00326522

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