Effect of calmodulin inhibitors on aluminium toxicity in cereals
1987
Slaski, J.J. | Aniol, A. (Institute of Plant Breeding and Acclimatization, Radzikow (Poland). Dept. of Biochemistry)
Calmodulin inhibitors trifluoperazine, chlorpromazine, dibucaine, tetracaine at 0.15 mV concentration inhibited from 5 to 10% root growth and softened root tissues in rye and wheat. At the same concentration they increased toxicity of Al exp(3+) at the nonlethal dose causing total inhibition of root growth. The effect of the inhibitors on root growth and aluminium uptake depended on the type of the inhibitor and kind of cereal species but in both of them lethal effect of the inhibitors was not related to Al content in root tips. The lethal effect of trifluoperazine in Al toxicated plant was associated with an increase of intracellular concentration of aluminium and its shift from cytosol to nuclei was observed also previously at the lethal concentration of aluminium. ATP-ase of root tips seems to be not calmodulin-dependent and its activity was increased by calmodulin inhibitor, probably due to their nonspecific action. (Authors)
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