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Aluminium and hydrogen ions inhibit a mechanosensory calcium-selective cation channelThe tension-dependent activity of mechanosensory calcium-selective cation channels in excised plasmalemmal patches from onion bulb scale epidermis is modulated by pH in the physiologically meaningful range between 4.5 and 7.2. It is rapidly lowered by lowering pH and rapidly raised by raising pH. Channel activity is effectively inhibited by low levels of aluminium ions and activity can be partially restored by washing for a few minutes. We suggest that under normal conditions the sensitivity of the mechanosensory channels to pH of the wall free space plays important roles in regulation of plant activities such as growth. We further suggest that, when levels of acid and aluminium ions in the soil solution are high, they might inhibit similar sensory channels in cells of the root tip, thus contributing critically to the acid soil syndrome.
Document ID
20040090250
Document Type
Reprint (Version printed in journal)
Authors
Ding, J. P.
(Washington University Saint Louis, MO 63130-4899)
Pickard, B. G.
Date Acquired
August 21, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Australian journal of plant physiology
Volume: 20
ISSN: 0310-7841
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-3046
CONTRACT_GRANT: NAGW-1782
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
NASA Discipline Number 40-50
Non-NASA Center
NASA Program Space Biology
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