Limitation of C4 photosynthesis by low carbonic anhydrase activity increases with temperature but does not influence mesophyll CO2 conductance

Crawford, Joseph D.; Cousins, Asaph B.; Lawson, Tracy

doi:10.1093/jxb/erab464

Limitation of C4 photosynthesis by low carbonic anhydrase activity increases with temperature but does not influence mesophyll CO2 conductance

Journal Article · 26 October 2021 · Journal of Experimental Botany

DOI:https://doi.org/10.1093/jxb/erab464· OSTI ID:1979499

^[1]; ; Lawson, Tracy

OSTI

The CO2-concentrating mechanism (CCM) in C4 plants is initiated by the uptake of bicarbonate (HCO3…) via phosphoenolpyruvate carboxylase (PEPC). Generation of HCO3– for PEPC is determined by the interaction between mesophyll CO2 conductance and the hydration of CO2 to HCO3– by carbonic anhydrase (CA). Genetic reduction of CA was previously shown not to limit C4 photosynthesis under ambient atmospheric partial pressures of CO2 (pCO2). However, CA activity varies widely across C4 species and it is unknown if there are specific environmental conditions (e.g. high temperature) where CA may limit HCO3– production for C4 photosynthesis. Additionally, CA activity has been suggested to influence mesophyll conductance, but this has not been experimentally tested. We hypothesize that CA activity can limit PEPC at high temperatures, particularly at low pCO2, but does not directly influence gm. Here we tested the influence of genetically reduced CA activity on photosynthesis and gm in the C4 plant Zea mays under a range of pCO2 and temperatures. Reduced CA activity limited HCO3– production for C4 photosynthesis at low pCO2 as temperatures increased, but did not influence mesophyll conductance. Therefore, high leaf CA activity may enhance C4 photosynthesis under high temperature when stomatal conductance restricts the availability of atmospheric CO2.

Research Organization:: Washington State Univ., Pullman, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0001685

OSTI ID:: 1979499

Journal Information:: Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 3 Vol. 73; ISSN 0022-0957

Publisher:: Oxford University Press

Country of Publication:: United States

Language:: English

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