GIMENO, Teresa E.; OGÉE, Jérôme; ROYLES, Jessica; GIBON, Yves; WEST, Jason B.; BURLETT, Régis; JONES, Sam P.; SAUZE, Joana; WOHL, Steven; BENARD, Camille; GENTY, Bernard; WINGATE, Lisa

doi:10.1111/nph.14584

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GIMENO, Teresa E.
Interactions Sol Plante Atmosphère [UMR ISPA]

OGÉE, Jérôme
Interactions Sol Plante Atmosphère [UMR ISPA]

ROYLES, Jessica
Department Plant Sciences

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Article de revue

Ce document a été publié dans

New Phytologist. 2017, vol. 215, n° 3, p. 965-976

Wiley

Résumé en anglais

Carbonyl sulphide (COS) is a potential tracer of gross primary productivity (GPP), assuming a unidirectional COS flux into the vegetation that scales with GPP. However, carbonic anhydrase (CA), the enzyme that hydrolyses COS, is expected to be light independent, and thus plants without stomata should continue to take up COS in the dark. We measured net CO2 (A(C) ) and COS (A(S) ) uptake rates from two astomatous bryophytes at different relative water contents (RWCs), COS concentrations, temperatures and light intensities. We found large A(S) in the dark, indicating that CA activity continues without photosynthesis. More surprisingly, we found a nonzero COS compensation point in light and dark conditions, indicating a temperature-driven COS source with a Q10 (fractional change for a 10°C temperature increase) of 3.7. This resulted in greater A(S) in the dark than in the light at similar RWC. The processes underlying such COS emissions remain unknown. Our results suggest that ecosystems dominated by bryophytes might be strong atmospheric sinks of COS at night and weaker sinks or even sources of COS during daytime. Biotic COS production in bryophytes could result from symbiotic fungal and bacterial partners that could also be found on vascular plants.< Réduire

Mots clés

sulfure de carbonyle

anhydrase carbonique

marchantia polymorpha

Mots clés en anglais

moss

liverwort

desiccation

carbohydrates

carbonic anhydrase

respiration

protein

Scleropodium purum

DOI

http://dx.doi.org/10.1111/nph.14584

Projet Européen

Carbonic anhydrase: where the CO2, COS and H2O cycles meet

Project ANR

Etude des mécanismes de régulation de l'anhydrase carbonique et des flux de COS et CO18O dans les écosystèmes terrestres - ANR-13-BS06-0005

Origine

Importé de hal

Unités de recherche

Biologie du Fruit & Pathologie (BFP) - UMR 1332