Cousins, Asaph; Badger, Murray; von Caemmerer, Susanne
In C4 plants, carbonic anhydrase (CA) facilitates both the chemical and isotopic equilibration of atmospheric CO2 and bicarbonate (HCO3-) in the mesophyll cytoplasm. The CA-catalyzed reaction is essential for C4 photosynthesis, and the model of carbon isotope discrimination (Δ13C) in C4 plants predicts that changes in CA activity will influence Δ 13C. However, experimentally, the influence of CA on Δ13C has not been demonstrated in C4 plants. Here, we compared measurements of Δ13C during C4...[Show more]
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