Uncertainties and limitations of using carbon‐13 and oxygen‐18 leaf isotope exchange to estimate the temperature response of mesophyll CO 2 conductance in C 3 plants

Sonawane, Balasaheb V.; Cousins, Asaph B.

doi:10.1111/nph.15585

Title: Uncertainties and limitations of using carbon‐13 and oxygen‐18 leaf isotope exchange to estimate the temperature response of mesophyll CO ₂ conductance in C ₃ plants

Journal Article · Fri Dec 14 00:00:00 EST 2018 · New Phytologist

DOI:https://doi.org/10.1111/nph.15585· OSTI ID:1486896

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School of Biological Sciences Washington State University Pullman WA 99164 USA

Summary The internal CO ₂ gradient imposed by mesophyll conductance ( g _m ) reduces substrate availability for C ₃ photosynthesis. With several assumptions, estimates of g _m can be made from coupled leaf gas exchange with isoflux analysis of carbon ∆ ¹³ C‐ g _m and oxygen in CO ₂ , coupled with transpired water (H ₂ O) ∆ ¹⁸ O‐ g _m to partition g _m into its biochemical and anatomical components. However, these assumptions require validation under changing leaf temperatures. To test these assumptions, we measured and modeled the temperature response (15–40°C) of ∆ ¹³ C‐ g _m and ∆ ¹⁸ O‐ g _m along with leaf biochemistry in the C ₃ grass Panicum bisulcatum , which has naturally low carbonic anhydrase activity. Our study suggests that assumptions regarding the extent of isotopic equilibrium ( θ ) between CO ₂ and H ₂ O at the site of exchange, and that the isotopic composition of the H ₂ O at the sites of evaporation ( ) and at the site of exchange ( ) are similar, may lead to errors in estimating the ∆ ¹⁸ O‐ g _m temperature response. The input parameters for ∆ ¹³ C‐ g _m appear to be less sensitive to temperature. However, this needs to be tested in species with diverse carbonic anhydrase activity. Additional information on the temperature dependency of cytosolic and chloroplastic pH may clarify uncertainties used for ∆ ¹⁸ O‐ g _m under changing leaf temperatures.

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Sponsoring Organization:: USDOE

OSTI ID:: 1486896

Journal Information:: New Phytologist, Journal Name: New Phytologist Vol. 222 Journal Issue: 1; ISSN 0028-646X

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 8 works

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Title: Uncertainties and limitations of using carbon‐13 and oxygen‐18 leaf isotope exchange to estimate the temperature response of mesophyll CO ₂ conductance in C ₃ plants