Effect of a Single Excitation Stimulus on Photosynthetic Activity and Light-dependent pH Banding in Chara Cells

Effect of a Single Excitation Stimulus on Photosynthetic Activity and Light-dependent pH Banding... Using pH microelectrodes and a Micro-scopy PAM (pulse-amplitude modulated) chlorophyll fluorometer, it is shown that a propagation of an action potential in Chara corallina leads to transient suppression of spatially periodic pH profiles along the illuminated cell. The suppression was manifested as a large pH decrease in the alkaline zones and a slight pH increase in the acid zones. The propagating action potential diminished the maximum yield of chlorophyll fluorescence (Fm′) in the alkaline cell regions, as well as the quantum yield of photosystem II photochemistry, without affecting Fm′ in the acid cell regions. The results indicate an interference of membrane excitation in the mechanisms responsible for pH banding patterns in Characean algae. Apparently, the electrical excitation of the plasma membrane in the alkaline cell regions initiates a pathway that can modulate membrane events at the thylakoid membrane. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Effect of a Single Excitation Stimulus on Photosynthetic Activity and Light-dependent pH Banding in Chara Cells

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Publisher
Springer-Verlag
Copyright
Copyright © 2004 by Springer-Verlag
Subject
Life Sciences; Human Physiology; Biochemistry, general
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s00232-004-0716-5
Publisher site
See Article on Publisher Site

Abstract

Using pH microelectrodes and a Micro-scopy PAM (pulse-amplitude modulated) chlorophyll fluorometer, it is shown that a propagation of an action potential in Chara corallina leads to transient suppression of spatially periodic pH profiles along the illuminated cell. The suppression was manifested as a large pH decrease in the alkaline zones and a slight pH increase in the acid zones. The propagating action potential diminished the maximum yield of chlorophyll fluorescence (Fm′) in the alkaline cell regions, as well as the quantum yield of photosystem II photochemistry, without affecting Fm′ in the acid cell regions. The results indicate an interference of membrane excitation in the mechanisms responsible for pH banding patterns in Characean algae. Apparently, the electrical excitation of the plasma membrane in the alkaline cell regions initiates a pathway that can modulate membrane events at the thylakoid membrane.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Jan 1, 2004

References

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