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Cytology of a pentaploid hybrid and genome analysis in Solanum nigrum L.

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Abstract

Cytology of a pentaploid hybrid (2n=60) produced by crossing an autotetraploid (2n=48) of a diploid “race” of Solanum nigrum L. as seed parent with the naturally occurring hexaploid S. nigrum (2n=72) was studied which showed approximately 24II+12I. Chromosome pairing in the gametic complement of the hexaploid was deduced to be 12II+12I and on this basis it is concluded that the natural hexaploid is an autoallohexaploid, which has three sets (genomes) of 12 chromosomes each, two of which are to a large extent homologous to each other. Theoretically the genomic formula can be tentatively written as AAAABB. Since the natural hexaploid does not show any quadrivalents between the four homologous A genomes, chromosome pairing appears to be restricted to bivalent formation by a special genetic mechanism. The probability that S. nigrum could be an autohexaploid, parallelling Pheleum pratense, has been discussed.

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  1. M. Krishna Rao

    Present address: Department of Botany, Andhra University Post Graduate Centre, Guntur-5, India

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  1. Department of Botany, Andhra University, Waltair, India

    M. Krishna Rao

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  1. M. Krishna Rao
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Rao, M.K. Cytology of a pentaploid hybrid and genome analysis in Solanum nigrum L.. Genetica 42, 157–164 (1971). https://doi.org/10.1007/BF00154846

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  • DOI: https://doi.org/10.1007/BF00154846

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