Genetic differentiation and Temperature requirement for maturation in Undaria pinnatifida (Phaeophyceae)

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Genetic differentiation among the wild populations of Undaria pinnatifida (Phaeophyceae) was analyzed using mitochondrial and nuclear SSR markers in northern Kanto. 30-50 plants were collected from each of five populations (Onahama, Ju-oh, Oharai, Choshi, Katsu-ura ; north to south), among which the Onahama population was highly differentiated with the Fst values of 0.46-0.56 in SSR. Any mitochondrial haplotypes of the Onahama population were not shared with other populations, but some alleles of SSRs were common among Onahama, Ju-Oh and Oharai. These results suggests that the genetic structure reported based on the mitochondrial marker could be observed in nuclear markers, and that the gene-flow of this oogamous species might be occurred by male gametes rather than the female gametes and zoospores.