Abstract
The apical plasma membrane of young Arabidopsis root hairs has recently been found to contain a depolarisation-activated Ca2+ channel, in addition to one activated by hyperpolarisation. The depolarisation-activated Ca2+ channel may function in signalling but the possibility that the root hair apical plasma membrane voltage may oscillate between a hyperpolarised and depolarised state suggests a role in growth control. Plant NADPH oxidase activity has yet to be considered in models of oscillatory voltage or ionic flux despite its predicted electrogenicity and voltage dependence. Activity of root NADPH oxidase was found to be stimulated by restricting Ca2+ influx, suggesting that these enzymes are involved in sensing Ca2+ entry into cells.Addendum to: Miedema H, Demidchik V, Véry A-A, Bothwell JHF, Brownlee C, Davies JM. Two voltage-dependent calcium channels co-exist in the apical plasma membrane of Arabidopsis thaliana root hairs. New Phytol 2008; doi:10.1111/j.1469-8137.2008.02465.x
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