Title: Effects of Cadmium on Membrane Potential Differences and Membrane Permeability of Rice Roots
Abstract:Changes of membrane permeability and membrane potential difference are probably important reasons for abnormal nutrient absorption under cadmium stress.Effects of cadmium on membrane potential differe...Changes of membrane permeability and membrane potential difference are probably important reasons for abnormal nutrient absorption under cadmium stress.Effects of cadmium on membrane potential differences in epidermal cells of rice roots and on membrane permeability were studied in this paper through the glass microelectrode technique and the K+ efflux measurement.Membrane potential differences of epidermal cells depolarized in a few minutes after addition of 0.1 or 1 mmol·L-1 Cd solution.The depolarization of root cells of Yangdao 6 seedlings was higher than that of Huaidao 11 seedlings.This effect was transient and the initial membrane potential difference recovered slowly.Membrane potential difference of Huaidao 11 seedlings recovered to the initial level after 6~8 h of 1.0 mmol·L-1 Cd2+ treatment,while that of Yangdao 6 still couldn't reach the initial level after 12 h of treatment.Membrane permeability,represented with the potassium efflux from roots into the external solution,increased in the presence of 0.1 or 1 mmol·L-1 Cd,and the effect lasted for at least 8 h.Yangdao 6 roots had considerably more K+ efflux than Huaidao 11 roots when medium had no Cd2+,while when roots were treated with 0.1 or 1 mmol·L-1 Cd2+ the difference between both rice varieties was much shortened and Yangdao 6 presented only a liltte superiority.Considered the response of membrane potential and the membrane permeability,Yangdao 6 showed higher sensitivity to Cd2+ than Huaidao 11.Read More
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 2
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