Parthenogenetic female populations in the brown alga <i>Scytosiphon lomentaria</i> (Scytosiphonaceae, Ectocarpales): decay of a sexual trait and acquisition of asexual traits

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  • Masakazu Hoshino
    Department of Natural History Sciences Graduate School of Science Hokkaido University Sapporo 060‐0810 Japan
  • Tatsufumi Okino
    Faculty of Environmental Earth Science Hokkaido University Sapporo 060‐0810 Japan
  • Kazuhiro Kogame
    Department of Biological Sciences Faculty of Science Hokkaido University Sapporo 060‐0810 Japan
  • M. Cock
    editor

書誌事項

公開日
2018-12-06
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/jpy.12812
公開者
Wiley

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<jats:p>In isogamous brown algae, the sexuality of populations needs to be tested by laboratory crossing experiments, as the sexes of gametophytes are morphologically indistinguishable. In some cases, gamete fusion is not observed and the precise reproductive mode of the populations is unknown. In the isogamous brown alga <jats:italic>Scytosiphon lomentaria</jats:italic> in Japan, both asexual (gamete fusion is unobservable) and sexual populations (gamete fusion is observable) have been reported. In order to elucidate the reproductive mode of asexual populations in this species, we used <jats:styled-content style="fixed-case">PCR</jats:styled-content>‐based sex markers to investigate the sex ratio of three asexual and two sexual field populations. The markers indicated that the asexual populations consisted only of female individuals, whereas sexual populations are composed of both males and females. In culture, female gametes of most strains from asexual populations were able to fuse with male gametes; however, they had little to no detectable sexual pheromones, significantly larger cell sizes, and more rapid parthenogenetic development compared to female/male gametes from sexual populations. Investigations of sporophytic stages in the field indicated that alternation of gametophytic and parthenosporophytic stages occur in an asexual population. These results indicate that the <jats:italic>S. lomentaria</jats:italic> asexual populations are female populations that lack sexual reproduction and reproduce parthenogenetically. It is likely that females in the asexual populations have reduced a sexual trait (pheromone production) and have acquired asexual traits (larger gamete sizes and rapid parthenogenetic development).</jats:p>

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