Effects of Nitrate and Phosphate on the Growth and Maturation of Gametophytes of Laminaria religiosa Miyabe(Phaeophyceae).
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Accession number;01A0744146
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| Title;Effects of Nitrate and Phosphate on the Growth and Maturation of Gametophytes of Laminaria religiosa Miyabe(Phaeophyceae). |
| Author;
MIZUTA H
(Hokkaido Univ., Hokkaido, Jpn)
NARUMI H
(Nippon Data Service Co. Ltd, Hokkaido, Jpn)
YAMAMOTO H
(Hokkaido Univ., Hokkaido, Jpn)
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Journal Title;Suisan Zoshoku
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Journal Code:Y0285A
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ISSN:0371-4217
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VOL.49;NO.2;PAGE.175-180(2001)
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| Figure&Table&Reference;FIG.1, TBL.3, REF.13 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Zoospores of Laminaria religiosa were cultured for 81-97 days in different nitrate(0-100.MU.M) and phosphate(0-10.MU.M) concentrations in order to examine the effects of nitrate and phosphate on the growth and maturation of gametophytes in batch culture. The female gametophytes matured and formed sporophytes at concentrations of more than 5.0.MU.M nitrate and more than 1.0.MU.M phosphate. These are the critical levels necessary for allowing the development from a gametophyte into a sporophyte, in cases when the maturation of the gametophyte is limited by both nitrate and phosphate. The critical nitrate concentration decreased to 1.0.MU.M when the phosphate concentration was sufficient, and the critical phosphate concentration similarly decreased to 0.5.MU.M when the nitrate level was sufficient, indicating that the critical concentration is affected by the synergy between the concentrations of two nutrients. The effects of irradiance(0.76-14.8.MU.E/m'2'/s) and water temperature(5-15.DEG.C.) on gametophyte maturation and sporophyte formation were also examined in six nutrient concentrations. Low nutrient concentration or low irradiance independently delayed maturation and formation, showing that the reproduction of L.religiosa gametophytes is controlled by the accumulation of nutrients in a plant and by quantum dose. (author abst.) |
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