NDLI: Facilitated permeation of methyl viologen into chloroplasts in situ during electric pulse generation in excitable plant cell membranes

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Facilitated permeation of methyl viologen into chloroplasts in situ during electric pulse generation in excitable plant cell membranes

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Facilitated permeation of methyl viologen into chloroplasts in situ during electric pulse generation in excitable plant cell membranes

Content Provider	Springer Nature Link
Author	Bulychev, A. A. Krupenina, N. A.
Copyright Year	2008
Abstract	Generation of action potential (AP) in plasma membranes of characean algae has a strong impact on photoreactions occurring in chloroplasts. Under physiological conditions, AP suppresses electron transport in alkaline and acidic regions, although to a different extent; these changes are transient and reversible. In the presence of the artificial electron acceptor, methyl viologen (MV$^{2+}$), AP-induced changes in electron transport in photosystem II become irreversible. Incubation of Chara corallina internodal cells with MV$^{2+}$ has no effect on the chlorophyll P700 photooxidation kinetics in photosystem I reaction centers, suggesting that MV$^{2+}$ is inaccessible for interactions with photosystem I, because its permeation into chloroplasts of a resting cell is hindered by membrane barriers. At the same time, AP generation in the presence of MV$^{2+}$ is accompanied by irreversible modification of P700 photooxidation kinetics, as can be evidenced from differences in absorption changes at 810 and 870 nm (ΔA $_{810}$ signals). These findings suggest that MV$^{2+}$ permeation into chloroplasts in situ is facilitated during or after the AP generation. Similar to the ΔA $_{810}$ signals, light-induced changes in membrane potential do not depend on the presence of MV$^{2+}$ in the external medium until the first excitatory stimulus is applied. Electric photoresponses of the cell are irreversibly modified by AP generated in the presence of MV$^{2+}$ at the expense of non-cyclic photosynthetic electron transport redirected to the MV$^{2+}$ reduction. It is concluded that AP effects on chloroplast photosynthesis in situ are complex and involve permeability changes for MV$^{2+}$ in membrane barriers of the “plasmalemma-chloroplast envelope” system.
Starting Page	387
Ending Page	394
Page Count	8
File Format	PDF
ISSN	19907478
Journal	Biochemistry (Moscow) Supplement Series A: Membrane and Cell Biology
Volume Number	2
Issue Number	4
e-ISSN	19907494
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-12-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Biophysics

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