Abstract
The internodal cells of Characean algal species have long served as a model for membrane processes in plants, because their large size (up to several centimetres in length), simple geometry (cylinder) and clear separation from other cells in the plant have allowed experimental techniques such as multielectrode electrophysiological techniques and cell perfusion. However, the membranes of these cells are not homogeneous, but show distinct differences in their electrophysiological characteristics and transport capabilities. The most obvious example of this non uniformity is the pH difference seen in the external medium surrounding the cells, the “acid bands”, with a pH similar or slightly acid to the bulk medium, and “alkaline bands”, which can support a pH of 10 or higher. We explore here the transport properties that underlie these differences and their relation to photosynthesis.
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Abbreviations
- ADP:
-
Adenosine diphosphate
- AP:
-
Action potential
- APW:
-
Artificial pond water
- ATP:
-
Adenosine triphosphate
- AZ:
-
Acetazolamide
- Ej :
-
Nernst potential for the ion j
- DIC:
-
Dissolved inorganic carbon
- DES:
-
Diethylstilbestrol
- DCMU:
-
(3-(3,4-dichlorophenyl)-1,1-dimethylurea
- DCCD:
-
N,N′-dicyclohexylcarbodiimide
- EZA:
-
Ethoxyzolamide, an inhibitor of carbonic anhydrase
- EDAC:
-
1–ethyl -3-(3-dimethylamino-propyl) carbodiimide
- Evo :
-
Vacuole to outside potential difference
- Eco :
-
Cytoplasm to outside potential difference
- Evc :
-
Vacuole to cytoplasm potential difference
- F:
- F:
-
Fluorescence yield
- F’m :
-
Saturation fluorescence
- GHK:
-
Goldman-Hodgkin-Katz equation
- g bkg :
-
Background conductance (I/V modelling)
- G/V:
-
Conductance as a function of voltage
- \( \Updelta \bar{\mu }_{H} ,\Updelta \bar{\mu }_{\text{Na}} \) :
-
Electrical chemical potential difference for H+ or Na+, respectively
- H+/OH− state:
-
State of the membrane whose electrical characteristics are dominated by H+ or OH− leak
- Hepes:
-
4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid, zwitterionic buffer with pKa = 7.55/OH
- I bkg :
-
Background current (I/V modelling)
- k 0io , k 0oI , kio, koi :
-
Proton pump parameters (I/V modelling)
- I/V:
-
Current as a function of voltage
- NEM:
-
N-ethyl maleimide
- NPQ:
-
Non-photochemical quenching, a measure of impairment of photosynthesis derived from fluorescence studies
- NXPX :
-
Number of channels conducting ion X
- PCMBS:
-
p-(chloromercuri)benzene sulfonate
- PD:
-
Electrical potential difference across a membrane
- pHc :
-
Cytoplasmic pH
- pHo :
-
External pH
- Po− and Po+ :
-
Open probabilities of a channel at negative and positive potentials, respectively
- R:
-
Gas constant 8.314 J/mol.K
- Rco :
-
Plasma membrane resistance
- T:
-
Temperature in Kelvin
- V :
-
Transmembrane PD in volts
- V 50 :
- V bkg :
-
Background current reversal PD (I/V modelling, usually taken as -100 mV)
- [X]o, [X]i :
-
Medium and intracellular concentrations, respectively, of ion X (Eq. 11.1)
- Y′:
-
Quantum yield, a measure of photosynthesis derived from fluorescence studies
- Z:
-
Valency of ion X (Eq. 11.1)
- z g :
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Beilby, M.J., Bisson, M.A. (2012). pH Banding in Charophyte Algae. In: Volkov, A. (eds) Plant Electrophysiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29119-7_11
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