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Polyploidy inDioscorea

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Summary

  1. 1.

    Bulbils ofDioscorea of different species and individuals were collected and grown in the garden. Somatic number was found out following Feulgen squash technique.

  2. 2.

    Dioscorea sativa has a chromosome number of 2n=40 andD. alata has a polyploid series of thirty, forty, fifty and seventy chromosomes in different individuals. Satellite counts were also taken.

  3. 3.

    Certain individuals ofD. alata revealed the presence of different chromosome numbers, viz., thirty-eight, fifty-two, fifty-five, sixty-six in the somatic cells of the same individual.

  4. 4.

    Meiotic divisional stages were only obtained inD. saliva showing clear twenty bivalents.

  5. 5.

    Significance of a polyploid series in the same species and different chromosome numbers in the same individual, especially in plants propagating mainly through vegetative means, from the point of view of speciation has been discussed.

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Authors and Affiliations

  1. Cytogenetics Laboratory Botany Department, Calcutta University, 35, Ballygunge Circular Road, 19, Calcutta, India

    Arun Kumar Sharma & Deepesh N. de

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  1. Arun Kumar Sharma
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  2. Deepesh N. de
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Sharma, A.K., de Deepesh, N. Polyploidy inDioscorea . Genetica 28, 112–120 (1957). https://doi.org/10.1007/BF01694314

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  • DOI: https://doi.org/10.1007/BF01694314

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