Mesophyll conductance in Zea mays responds transiently to CO 2 availability: implications for transpiration efficiency in C 4 crops

Kolbe, Allison R.; Cousins, Asaph B.

doi:10.1111/nph.14942

Title: Mesophyll conductance in Zea mays responds transiently to CO ₂ availability: implications for transpiration efficiency in C ₄ crops

Journal Article · Fri Dec 08 00:00:00 EST 2017 · New Phytologist

DOI:https://doi.org/10.1111/nph.14942· OSTI ID:1412583

Kolbe, Allison R. ^[1]; Cousins, Asaph B. ^[1]

School of Biological Sciences Washington State University Pullman WA 99164 USA

Summary Mesophyll conductance ( g _m ) describes the movement of CO ₂ from the intercellular air spaces below the stomata to the site of initial carboxylation in the mesophyll. In contrast with C ₃ ‐ g _m , little is currently known about the intraspecific variation in C ₄ ‐ g _m or its responsiveness to environmental stimuli. To address these questions, g _m was measured on five maize ( Zea mays ) lines in response to CO ₂ , employing three different estimates of g _m . Each of the methods indicated a significant response of g _m to CO ₂ . Estimates of g _m were similar between methods at ambient and higher CO ₂ , but diverged significantly at low partial pressures of CO ₂ . These differences are probably driven by incomplete chemical and isotopic equilibrium between CO ₂ and bicarbonate under these conditions. Carbonic anhydrase and phosphoenolpyruvate carboxylase in vitro activity varied significantly despite similar values of g _m and leaf anatomical traits. These results provide strong support for a CO ₂ response of g _m in Z. mays , and indicate that g _m in maize is probably driven by anatomical constraints rather than by biochemical limitations. The CO ₂ response of g _m indicates a potential role for facilitated diffusion in C ₄ ‐ g _m . These results also suggest that water‐use efficiency could be enhanced in C ₄ species by targeting g _m .

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Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0008769

OSTI ID:: 1412583

Journal Information:: New Phytologist, Journal Name: New Phytologist Vol. 217 Journal Issue: 4; ISSN 0028-646X

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 25 works

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Title: Mesophyll conductance in Zea mays responds transiently to CO ₂ availability: implications for transpiration efficiency in C ₄ crops