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To clarify the population structure of the wild haploid laver Porphyra yezoensis twelve isozyme loci were examined by starch gel electrophoresis. The allelic frequencies were calculated for 11 sites in a natural Tomarihama population. Fst value which measures genetic differentiation was 0.1252, indicating that the population structure of the wild Porphyra yezoensis has a remarkable tendency to consist of a number of patches.The proportion of polymorphic loci varied from 0.417 to 0.917 with a mean of 0.583 and heterozygosity over 12 loci varied from 0.123 to 0.344 with a mean of 0.197. The over all mean was similar to those obtained for diploid marine molluscs in which the population structure has a tendency to split into a number of subpopulations.Observed number of allelic combinations at one linkage group of Aat-Cat-Dia-Gpi-Mpi-6Pgd-G6pd loci was significantly lesser than the expected number. The results can be explained by clonal propagation of this haploid plant.

Enzyme polymorphism and population structure of the haploid laver Porphyra yezoensis.