Cytotaxonomical Research on the Characeae: Karyotype of the Section Nitella of the Genus Nitella

Abstract

The results of a cytotaxonomical research for Nitella flexilis (n=12, from four habitats), Nitella inokasiraensis (n=6) and Nitella opaca (n=6) are reported. Special relations between the centromere positions of the chromosomes of N. flexilis complex were found, and the basic number (x=3) for the section Nitella is suggested. The patterns of the karyotypes of the 3 species and 1 form were analysed.