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Relationships between carbonyl sulfide (COS) and CO 2 during leaf gas exchange
Author(s) -
Stimler Keren,
Montzka Stephen A.,
Berry Joseph A.,
Rudich Yi,
Yakir Dan
Publication year - 2010
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/j.1469-8137.2010.03218.x
Subject(s) - carbonyl sulfide , chemistry , carbon dioxide , sulfide , organic chemistry , sulfur
Summary• Carbonyl sulfide (COS) exchange in C 3 leaves is linked to that of CO 2 , providing a basis for the use of COS as a powerful tracer of gross CO 2 fluxes between plants and the atmosphere, a critical element in understanding the response of the land biosphere to global change. • Here, we carried out controlled leaf‐scale gas‐exchange measurements of COS and CO 2 in representative C 3 plants under a range of light intensities, relative humidities and temperatures, CO 2 and COS concentrations, and following abscisic acid treatments. • No ‘respiration‐like’ emission of COS or detectable compensation point, and no cross‐inhibition effects between COS and CO 2 were observed. The mean ratio of COS to CO 2 assimilation flux rates, A s / A c , was c. 1.4 pmol μmol −1 and the leaf relative uptake (assimilation normalized to ambient concentrations, ( A s / A c )( C a c / C a s )) was 1.6–1.7 across species and conditions, with significant deviations under certain conditions. Stomatal conductance was enhanced by increasing COS, which was possibly mediated by hydrogen sulfide (H 2 S) produced from COS hydrolysis, and a correlation was observed between A s and leaf discrimination against C 18 OO. • The results provide systematic and quantitative information necessary for the use of COS in photosynthesis and carbon‐cycle research on the physiological to global scales.