Dependence of the CO2 Uptake in a Plant Cell on the Plasma Membrane H+-ATPase Activity: Theoretical Analysis


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A decrease of the plasma membrane H+-ATPase activity in plant cells is associated with the formation of response to adverse factors and reception of signals. A theoretical analysis of the influence of the H+-ATPase activity on the flow of CO2 into a plant cell has been conducted. With this purpose the model of transport processes and electrogenesis in the plant cell developed previously was used, which takes into account transport systems, including H+-ATPase, in the plasma membrane and tonoplast. The CO2 fraction (\({P_{c{o_2}}}\)) in the total amount of inorganic carbon (Ci) in the external medium was used as an indicator of the CO2 amount entering the plant cell; this parameter depends on the extracellular pH, which, in particular, is influenced by the H+-ATPase activity. Excitable and non-excitable cells were simulated. It was shown that a decrease of the H+-ATPase activity causes a \({P_{c{o_2}}}\)reduction in both variants of the model, and this reduction has an extremum: after passing through minimal values, \({P_{c{o_2}}}\)reaches a stationary level. The dynamics of \({P_{c{o_2}}}\)decrease may be related to the Ca2+ influx into the cytoplasm of the plant cell. The reduction of \({P_{c{o_2}}}\)depended on the extent of the H+-ATPase inactivation and on its initial activity. As a whole, it was shown that the inactivation of the H+-ATPase can affect the CO2 uptake in a plant cell and thereby regulate photosynthetic processes.

作者简介

E. Sukhova

Lobachevsky State University of Nizhny Novgorod

Email: vssuh@mail.ru
俄罗斯联邦, Nizhni Novgorod, 603950

V. Sukhov

Lobachevsky State University of Nizhny Novgorod

编辑信件的主要联系方式.
Email: vssuh@mail.ru
俄罗斯联邦, Nizhni Novgorod, 603950

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