| Flow enhances photosynthesis in marine benthic autotrophs by increasing the efflux of oxygen from the organism to the water. | |
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MedLine Citation:
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PMID: 20133799 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Worldwide, many marine coastal habitats are facing rapid deterioration due in part to human-driven changes in habitat characteristics, including changes in flow patterns, a factor known to greatly affect primary production in corals, algae, and seagrasses. The effect of flow traditionally is attributed to enhanced influx of nutrients and dissolved inorganic carbon (DIC) across the benthic boundary layer from the water to the organism however, here we report that the organism's photosynthetic response to changes in the flow is nearly instantaneous, and that neither nutrients nor DIC limits this rapid response. Using microelectrodes, dual-pulse amplitude-modulated fluorometry, particle image velocimetry, and real time mass-spectrometry with the common scleractinian coral Favia veroni, the alga Gracilaria cornea, and the seagrass Halophila stipulacea, we show that this augmented photosynthesis is due to flow-driven enhancement of oxygen efflux from the organism to the water, which increases the affinity of the RuBisCO to CO(2). No augmentation of photosynthesis was found in the absence of flow or when flow occurred, but the ambient concentration of oxygen was artificially elevated. We suggest that water motion should be considered a fundamental factor, equivalent to light and nutrients, in determining photosynthesis rates in marine benthic autotrophs. |
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Authors:
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Tali Mass; Amatzia Genin; Uri Shavit; Mor Grinstein; Dan Tchernov |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-01-25 |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 107 ISSN: 1091-6490 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 2010 Feb |
Date Detail:
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Created Date: 2010-02-10 Completed Date: 2010-05-07 Revised Date: 2010-09-28 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: United States |
Other Details:
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Languages: eng Pagination: 2527-31 Citation Subset: IM |
Affiliation:
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H Steinitz Marine Biology Laboratory, Interuniversity Institute for Marine Sciences, Eilat 88103, Israel. tali.mass@mail.huji.ac.il |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms Animals Anthozoa / physiology Carbon Dioxide / metabolism Ecosystem* Fluorometry / instrumentation, methods Gracilaria / physiology Hydrocharitaceae / physiology Kinetics Marine Biology Mass Spectrometry / methods Microelectrodes Oxygen / metabolism* Photosynthesis / physiology* Ribulose-Bisphosphate Carboxylase / metabolism Seawater / chemistry Water Movements* |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide; 7782-44-7/Oxygen; EC 4.1.1.39/Ribulose-Bisphosphate Carboxylase |
| Comments/Corrections | |
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