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

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 CO 2 into a plant cell has been conducted. With this purp...

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Published in:Biochemistry (Moscow). Supplement series A, Membrane and cell biology Membrane and cell biology, 2018-04, Vol.12 (2), p.146-159
Main Authors: Sukhova, E. M., Sukhov, V. S.
Format: Article
Language:English
Subjects:
Adenosine triphosphatase
Biomedical and Life Sciences
Calcium influx
Calcium ions
Carbon dioxide
Cell Biology
Computer simulation
Cytoplasm
Deactivation
Dependence
H+-transporting ATPase
Hydrogen
Inactivation
Inorganic carbon
Life Sciences
Photosynthesis
Plant cells
Reduction
Theoretical analysis
Transport processes
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Summary: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 CO 2 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 CO 2 fraction ( P c o 2 ) in the total amount of inorganic carbon (C i ) in the external medium was used as an indicator of the CO 2 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 Ca 2+ 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 CO 2 uptake in a plant cell and thereby regulate photosynthetic processes.
ISSN:1990-7478
1990-7494
DOI:10.1134/S1990747818020149