Inorganic carbon utilization in marine angiosperms (seagrasses)

Functional Plant Biology : FPB
Sven BeerLennart Axelsson

Abstract

The mechanisms by which marine angiosperms, or seagrasses, utilize external inorganic carbon (Ci) include, in addition to uptake of CO2 formed spontaneously from HCO3-: (i) extracellular carbonic anhydrasemediated conversion of HCO3- to CO2 at normal seawater pH, or in acid zones created by H+ extrusion, and (ii) H+-driven utilization (direct uptake?) of HCO3-. The latter mechanism was recently indicated for Zostera marina, Halophila stipulaceaand Ruppia maritima, and manifested itself as a sensitivity of photosynthesis to buffers, as well as a relative insensitivity to acetazolamide under buffer-free conditions, especially at high pH. Seagrasses have until recently been viewed as having Ci utilization systems that are less 'efficient' than macroalgae, and this has, for example, led to the thought that future rises in atmospheric and thus dissolved CO2 would have a stronger effect on seagrasses than on macroalgae. However, most of the experiments leading to such conclusions were carried out in the laboratory on detached leaves, and buffers were used to keep HCO3-/CO2 ratios stable during Ci additions. The revelation that seagrass photosynthesis is sensitive to buffers as well as to physical perturbations, has led to new experim...Continue Reading

Citations

Feb 2, 2017·Scientific Reports·Tiago RepolhoRui Rosa
May 13, 2018·International Journal of Molecular Sciences·Charlotte PoschenriederJuan Barceló
Aug 21, 2019·Plant, Cell & Environment·Kasper Elgetti BrodersenMichael Kühl
May 20, 2008·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·John A RavenChristina L De La Rocha
Jan 7, 2014·Photosynthesis Research·John A RavenMario Giordano
Sep 16, 2017·Journal of Experimental Botany·Anthony William D LarkumJohn A Raven
Jul 31, 2012·Photosynthesis Research·John A Raven, Catriona L Hurd
Mar 19, 2013·Global Change Biology·Marguerite KochXing-Hai Zhang
Oct 18, 2015·Plant, Cell & Environment·Jens BorumGary A Kendrick
Oct 11, 2020·The Plant Journal : for Cell and Molecular Biology·Kasper Elgetti BrodersenKlaus Koren

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