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Title of Journal: J Membrane Biol

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Abbravation: The Journal of Membrane Biology

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Springer US

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10.1007/bf00370708

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1432-1424

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SalinityInduced Noise in Membrane Potential of Ch

Authors: Mary J Beilby Sabah Al Khazaaly Mary A Bisson
Publish Date: 2014/11/07
Volume: 248, Issue: 1, Pages: 93-102
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Abstract

Salt sensitive Characeae Chara australis responds to 50 mM NaCl by a prompt appearance of noise in the transmembrane potential difference PD The noise diminishes with time in saline and PD depolarization leading to altered current–voltage characteristics that could be modeled with H+/OH− channels Beilby and Al Khazaaly JMB 23021–34 2009 suggested that the noise might arise from cooperative transient opening of H+/OH− channels Presoaking cells in 10 μM melatonin over 24 h abolished the noise in some cells postponed its appearance in others or changed its characteristics As melatonin is a very effective antioxidant we postulated opening of H+/OH− channels by reactive oxygen species ROS Measurement of ROS using dihydrodichlorofluorescein diacetate confirmed substantial reduction in ROS production in melatonintreated cells in saline and sorbitol media However ROS concentration decreased as a function of time in saline medium Possible schemes for activation of H+/OH− channels under salinity stress are considered

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