Equal sex ratios of a marine green alga, Bryopsis plumosa

Journal of Integrative Plant Biology
Tatsuya Togashi, Paul Alan Cox

Abstract

By finding some important culture conditions as below, we succeeded in experimentally controlling the whole life history of a dioecious marine green alga, Bryopsis plumosa (Hudson) C. Agardh. In this study, we focused on the primary and secondary sex ratios (i.e. at inception and maturity) using these culture techniques. Gametogenesis was induced by culturing haploid gametophytes with Provasoli's enriched seawater (PES) medium under a 14:10 h light:dark cycle at 14 degrees C. Formed zygotes grew into diploid sporophytes, which were cultured for 3 months with PES medium under a 14:10 h light:nbsp;dark cycle at 18 degrees C. Then they were transferred into Schreiber medium and cultured under a 10:14 h light:dark cycle at 22 degrees C. Within 1 week, zoosporogenesis was observed. Zoospores were released within a couple of days. Each zoospore soon germinated and grew into a unisexual gametophyte. The primary sex ratio was examined in gametophytes that originated from a single sporophyte. The secondary sex ratio was studied in the field. Both were estimated as 1:1. Synchronized meiotic cell divisions might occur during zoosporogenesis dividing each sex-determining factor evenly among zoospores. Given the equal sex ratio at maturity,...Continue Reading

References

Sep 1, 1978·Scientific American·J M Smith
Jul 1, 1990·Proceedings of the National Academy of Sciences of the United States of America·N L GlassR L Metzenberg
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Mar 10, 2006·The International Journal of Developmental Biology·Scott Gilbert

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Citations

Aug 8, 2012·Proceedings of the National Academy of Sciences of the United States of America·Tatsuya TogashiPaul Alan Cox
Sep 8, 2009·Molecular Biology and Evolution·Nigel GrimsleyGwenaël Piganeau

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