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Cytomorphological studies in the genusHelianthus I. Karyotype studies in the diploid species

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Proceedings / Indian Academy of Sciences

Abstract

Karyotype of four 34 chromosome species ofHelianthus has been studied for the first time. The species differ very much morphologically with regard to several characters indicating considerable interspecific variation. Study of karyotype revealed wide range in their total chromosome length (260 to 140µ). Individual chromosomes are comparatively short with either median or sub-median centromere.H. annuus has a symmetrical karyotype with large number of median chromosomes whileH. debilis, H. argophyllus andH. lenticularis showed generally a tendency towards asymmetry. The species also differed with regard to number of chromosomes bearing secondary constriction.

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Authors and Affiliations

  1. Department of Agricultural Botany, University of Agricultural Sciences, 560 024, Hebbal, Bangalore

    R S Ramakanth & A Seetharam

Authors
  1. R S Ramakanth
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  2. A Seetharam
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Ramakanth, R.S., Seetharam, A. Cytomorphological studies in the genusHelianthus I. Karyotype studies in the diploid species. Proc. Indian Acad. Sci. 86, 155–158 (1977). https://doi.org/10.1007/BF03050942

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  • DOI: https://doi.org/10.1007/BF03050942

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