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Temperature dependence of trans plasma membrane electron transport in Zea mays L. roots
Author(s) -
DÖRING O.,
BÖTTGER M.
Publication year - 1994
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1994.tb00314.x
Subject(s) - depolarization , membrane , zea mays , chemistry , electron transport chain , membrane potential , atmospheric temperature range , analytical chemistry (journal) , microelectrode , plasma , electron transfer , biophysics , chromatography , photochemistry , biology , biochemistry , thermodynamics , electrode , agronomy , physics , quantum mechanics
Intact Zea mays L. cv. Golden Bantam seedlings which were not cold adapted were exposed to various temperatures. Trans plasma membrane potential difference was measured in a temperature range from 0 to 40 °C using intracellular microelectrodes. The depolarization caused by electron transfer across the PM to artificial external electron acceptors was investigated. Active membrane potential increased with temperature in the range from 0 to 15 °C but was independent of temperature above 20 °C. Depolarization caused by the non‐membrane‐permeating electron acceptors hexacyanoferrate III (HCF III) and hexabromoiridate IV (HBIIV) took place over the whole temperature range investigated. The effect of HBI IV increased up to 10 °C whereas the HCF III effects increased up to 25 °C.