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Bryophyte gas‐exchange dynamics along varying hydration status reveal a significant carbonyl sulphide (COS) sink in the dark and COS source in the light
Author(s) -
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
Publication year - 2017
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.14584
Subject(s) - photosynthesis , chemistry , sink (geography) , photorespiration , environmental chemistry , q10 , carbonic anhydrase , bryophyte , botany , respiration , enzyme , biochemistry , biology , cartography , geography
Summary 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 CO 2 ( 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 Q 10 (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.