caa a22 4500 445889462 CHVBK 20180317145611.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s11120-011-9630-8 doi (NATIONALLICENCE)springer-10.1007/s11120-011-9630-8 Crassulacean acid metabolism in the context of other carbon-concentrating mechanisms in freshwater plants: a review [Elektronische Daten] [Signe Klavsen, Tom Madsen, Stephen Maberly] Inorganic carbon can be in short supply in freshwater relative to that needed by freshwater plants for photosynthesis because of a large external transport limitation coupled with frequent depleted concentrations of CO2 and elevated concentrations of O2. Freshwater plants have evolved a host of avoidance, exploitation and amelioration strategies to cope with the low and variable supply of inorganic carbon in water. Avoidance strategies rely on the spatial variation in CO2 concentrations within and among lakes. Exploitation strategies involve anatomical and morphological features that take advantage of sources of CO2 outside of the water column such as the atmosphere or sediment. Amelioration strategies involve carbon-concentrating mechanisms based on uptake of bicarbonate, which is widespread, C4-fixation, which is infrequent, and crassulacean acid metabolism (CAM), which is of intermediate frequency. CAM enables aquatic plants to take up inorganic carbon in the night. Furthermore, daytime inorganic carbon uptake is generally not inhibited and therefore CAM is considered to be a carbon-conserving mechanism. CAM in aquatic plants is a plastic mechanism regulated by environmental variables and is generally downregulated when inorganic carbon does not limit photosynthesis. CAM is regulated in the long term (acclimation during growth), but is also affected by environmental conditions in the short term (response on a daily basis). In aquatic plants, CAM appears to be an ecologically important mechanism for increasing inorganic carbon uptake, because the in situ contribution from CAM to the C-budget generally is high (18-55%). Springer Science+Business Media B.V., 2011 Acclimation nationallicence CO2 nationallicence Carbon-concentrating mechanism (CCM) nationallicence Elodeids nationallicence Inorganic carbon nationallicence Isoetids nationallicence Macrophytes nationallicence Regulation nationallicence Klavsen Signe IFM-GEOMAR, Düsternbrookerweg 20, 24105, Kiel, Germany aut Madsen Tom Department of Biological Science, Aarhus University, Plant Biology, Ole Worms Allé 1135, 8000, Aarhus C, Denmark aut Maberly Stephen Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, LA1 4AP, Lancaster, UK aut Photosynthesis Research Springer Netherlands 109/1-3(2011-09-01), 269-279 0166-8595 109:1-3<269 2011 109 11120 https://doi.org/10.1007/s11120-011-9630-8 text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11120-011-9630-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Klavsen Signe IFM-GEOMAR, Düsternbrookerweg 20, 24105, Kiel, Germany aut NATIONALLICENCE 700 1- Madsen Tom Department of Biological Science, Aarhus University, Plant Biology, Ole Worms Allé 1135, 8000, Aarhus C, Denmark aut NATIONALLICENCE 700 1- Maberly Stephen Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, LA1 4AP, Lancaster, UK aut NATIONALLICENCE 773 0- Photosynthesis Research Springer Netherlands 109/1-3(2011-09-01), 269-279 0166-8595 109:1-3<269 2011 109 11120 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer