| To concentrate or ventilate? Carbon acquisition, isotope discrimination and physiological ecology of early land plant life forms. | |
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MedLine Citation:
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PMID: 18487135 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A comparative study has been made of the photosynthetic physiological ecology and carbon isotope discrimination characteristics for modern-day bryophytes and closely related algal groups. Firstly, the extent of bryophyte distribution and diversification as compared with more advanced land plant groups is considered. Secondly, measurements of instantaneous carbon isotope discrimination (Delta), photosynthetic CO(2) assimilation and electron transport rates were compared during the drying cycles. The extent of surface diffusion limitation (when wetted), internal conductance and water use efficiency (WUE) at optimal tissue water content (TWC) were derived for liverworts and a hornwort from contrasting habitats and with differing degrees of thallus ventilation (as intra-thalline cavities and internal airspaces). We also explore how the operation of a biophysical carbon-concentrating mechanism (CCM) tempers isotope discrimination characteristics in two other hornworts, as well as the green algae Coleochaete orbicularis and Chlamydomonas reinhardtii. The magnitude of Delta was compared for each life form over a drying curve and used to derive the surface liquid-phase conductance (when wetted) and internal conductance (at optimal TWC). The magnitude of external and internal conductances, and WUE, was higher for ventilated, compared with non-ventilated, liverworts and hornworts, but the values were similar within each group, suggesting that both factors have been optimized for each life form. For the hornworts, leakiness of the CCM was highest for Megaceros vincentianus and C. orbicularis (approx. 30%) and, at 5%, lowest in C. reinhardtii grown under ambient CO2 concentrations. Finally, evidence for the operation of a CCM in algae and hornworts is considered in terms of the probable role of the chloroplast pyrenoid, as the origins, structure and function of this enigmatic organelle are explored during the evolution of land plants. |
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Authors:
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Moritz Meyer; Ulli Seibt; Howard Griffiths |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Philosophical transactions of the Royal Society of London. Series B, Biological sciences Volume: 363 ISSN: 0962-8436 ISO Abbreviation: Philos. Trans. R. Soc. Lond., B, Biol. Sci. Publication Date: 2008 Aug |
Date Detail:
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Created Date: 2008-07-14 Completed Date: 2008-09-30 Revised Date: 2013-03-06 |
Medline Journal Info:
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Nlm Unique ID: 7503623 Medline TA: Philos Trans R Soc Lond B Biol Sci Country: England |
Other Details:
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Languages: eng Pagination: 2767-78 Citation Subset: IM |
Affiliation:
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Physiological Ecology Group, Department of Plant Sciences, University of Cambridge, Cambridge, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biological Evolution* Bryophyta / physiology* Carbon / metabolism* Carbon Dioxide / metabolism Carbon Isotopes Chlorophyta / physiology Ecosystem Models, Biological Photosynthesis |
| Chemical | |
Reg. No./Substance:
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0/Carbon Isotopes; 124-38-9/Carbon Dioxide; 7440-44-0/Carbon |
| Comments/Corrections | |
Erratum In:
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Philos Trans R Soc Lond B Biol Sci. 2013 Mar 5;368(1613):20120539 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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