Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Karyomorphological Studies on the Genus Spirogyra Link (Conjugales, Chlorophyta) from Korea

  • Kim, Jee-Hwan (Institute for Basic Sciences, Chungbuk National University) ;
  • Chaudhary, B.R. (Centre of Advanced Study in Botany, Banaras Hindu University) ;
  • Kim, Young-Hwan (Department of Biology, Chungbuk National University) ;
  • Lee, In-Kyu (School of Biological Science, Seoul National University)
  • Published : 2009.06.30
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Abstract

Freshwater green algae are one of the important sources of bioenergy in the future. Spirogyra is a conjugating filamentous zygnematacean green algal genus that is widely distributed worldwide with more than 400 species. Despite its widespread occurrence throughout the world, cytological studies of the genus have been limited. We investigated karyological features and chromosome numbers for seven Korean Spirogyra species. Most of the species examined in the present study showed significant karyological features, inner organization of nucleolus, heavily stainable nucleolar substance and the diffuse-centric nature of chromosomes, typical of the Conjugales. Chromosome number ranged from n=12 in S. varians to n=38 in S. africana. Aberrant cytokinesis resulted in binucleate and tetranucleate cells, which sometimes provide cytological explanation for different morphology and ploidal changes in clonal culture of Spirogyra or even different cells within the same filament. The present chromosome data also substantiates the earlier held assumption that aneuploidy must have been the chief driving force for speciation and evolution of the genus Spirogyra.

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References

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