Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Plant, cell & environment
4 (1981), S. 0
ISSN:
1365-3040
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Abstract. Accumulation of the lipophilic cation tri-phenylmethylphosphonium (TPMP+) has been used to estimate the plasmalemma potential (Φm) of Porphyra purpurea (Rhodophyta, Bangiales) and Ulva lactuca (Chlorophyta, Ulvales). Values of Φm obtained using the Nernst equation were −61 mV and −54 mV respectively; these values compare well with those obtained using glass microelectrodes. A trend of hyperpolarization of Φm in P. purpurea was observed with decreasing external salinity. This hyperpolarization was shown to be primarily due to changes in external K+ concentration. Varying external Na+ concentration was found to have little effect on Φm. The present data suggest that the membrane potential of P. purpurea is not wholly due to a K+ diffusion potential, but may have an electrogenic component.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/1365-3040.ep11611040
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