Measurement of the Sieve Tube Membrane Potential | Zendy

John Wright | Zendy; Donald B. Fisher | Zendy

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Measurement of the Sieve Tube Membrane Potential

Author(s) -

John Wright,

Donald B. Fisher

Publication year - 1981

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.67.4.845

Subject(s) - sieve tube element , depolarization , membrane potential , phloem , sieve (category theory) , membrane , sucrose , chemistry , bark (sound) , biophysics , chromatography , botany , biology , biochemistry , ecology , mathematics , combinatorics

A procedure is described for the measurement of the sieve tube membrane potential in the phloem of bark strips from Salix exigua Nutt. Measurements were made by inserting a measuring microelectrode into sap exuding from severed stylets of the willow aphid, Tuberolachnus salignus. Data taken from 20 bark strips gave an average potential of -155 +/- 9 millivolts. Evidence is presented for an electrogenic component of the sieve tube membrane potential. The occurrence of a saturable sucrose-induced membrane depolarization is consistent with the concept of sugar accumulation by a sucrose/H(+) co-transport mechanism.

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