Effect of Curvularia lunata phytotoxin on membrane permeability of corn roots

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Abstract
Corn roots exposed to the Curvularia lunata phytotoxin show a decreased ability to absorb and to retain rubidium, sulphate, and leucine compared with control roots. The phytotoxin also decreased the amount of the amino acid incorporation into protein, whereas respiration was only slightly affected. The effect on active transport was more pronounced and rapid than loss of ions and inhibition of protein synthesis. The data suggest that the phytotoxin causes a general plasma membrane derangement similar to that caused by other phytotoxins, which results in a depression of the active transport, reflected in an inhibition of precursors of proteins and in a loss of ions. The toxin is to be regarded as a specific membrane poison.

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