Reductions in photosynthetic carbon uptake in epiphytic diatoms by water-soluble extracts of leaves of Zostera marina |
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Authors: | Paul G. Harrison C. D. Durance |
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Affiliation: | (1) Department of Botany, University of British Columbia, V6T 2B1 Vancouver, British Columbia, Canada |
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Abstract: | A water-soluble fraction of green leaves of Zostera marina L. decreased carbon uptake rates in diatoms found as epiphytes at Roberts Bank (Lat 49°2N; Long. 123°8W) on the west coast of Canada. Extract concentrations of 11 to 1 g dry leaf ml-1, added immediately before 14C-uptake was measured over a 3-h period, reduced uptake to 36 to 80% of controls, respectively. A lower concentration (0.6 g dry leaf ml-1) reduced uptake significantly in only one of four cultures. Addition of the whole extract 3 d before carbon uptake was measured or in one-third doses, 0, 1, and 2 d before, resulted in inhibition similar to that observed when the whole extract was added immediately before the 14C. |
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