Sexual differentiation in population of prothallia inLygodium japonicum |
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Authors: | Kiyotoshi Takeno Masaki Furuya |
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Affiliation: | (1) Biology Department, Faculty of Science, University of Tokyo, Hongo, Bunkyo-ku, 113 Tokyo;(2) Present address: Department of Biology, Faculty of Science, The University of Calgary, T2N 1N4 Calgary, Canada |
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Abstract: | InLygodium japonicum, the archegonium was formed when the prothallium grew to approximately 1.5 mm in width irrespective of age, photoperiod, temperature or concentration of sucrose in the medium. Surgically cut prothallia produced archegonia only when the fragments regenerated to ca. 1 mm in width. Prothallia of smaller dimensions formed antheridia rather than archegonium, but only if archegoniated prothallia of the larger size coexisted in the population. Antheridiogens and inhibitors of archegonial differentiation became detectable by bioassay in conditioned media of 14-and 16-day-old prothallia, respectively, and continued to accumulate in the medium during culture in the light at 25 C. Twelve-day-old or younger prothallia are very sensitive to exogenously applied hormonal substances, whereas by day 14 the response had diminished. |
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Keywords: | Antheridium Archegonium Sexual differentiation Fern gametophyte Antheridiogen Lygodium |
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