Large plasma-membrane depolarization precedes rapid blue-light-induced growth inhibition in cucumber |
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Authors: | Edgar P Spalding Daniel J Cosgrove |
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Institution: | (1) Department of Biology, Pennsylvania State University, 16802 University Park, PA, USA |
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Abstract: | Blue-light (BL)-induced suppression of elongation of etiolated Cucumis sativus L. hypocotyls began after a 30-s lag time, which was halved by increasing the fluence rate from 10 to 100 mol·m-2·s-1. Prior to the growth suppression, the plasma-membrane of the irradiated cells depolarized by as much as 100 mV, then returned within 2–3 min to near its initial value. The potential difference measured with surface electrodes changed with an identical time course but opposite polarity. The lag time for the change in surface potential showed an inverse dependence on fluence rate, similar to the lag for the growth inhibition. Green light and red light caused neither the electrical response nor the rapid inhibition of growth. The depolarization by BL did not propagate to nonirradiated regions and exhibited a refractory period of about 10 min following a BL pulse. Fluenceresponse relationships for the electrical and growth responses provide correlational evidence that the plasma-membrane depolarization reflects an event in the transduction chain of this light-growth response.Abbreviations and symbols BL
blue light
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V
m
membrane potential
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V
8
surface potential |
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Keywords: | Blue light Cuoumis (elongation growth) Growth inhibition Hypocotyl (growth inhibition) Membrane depolarization |
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