Relative DNA Content of Three Cytotypes of Pohlia Nutants

Relative DNA content of three cytotypes of the moss Pohlia nutants have been estimated, using DAPI staining technique. Evidence is presented and showing that the mean relative DNA contents increased from haploid to diploid and from diploid to triploid P.nutants cytotypes, but they differ significantly from an expected 1: 2: 3 ratio in haploid, diploid and triploid races. Polyploidy has played a main role in generating the cytotypes. It seems likely that the haploid, diploid and triploid races of P. nutants are of long standing autopolyploid