[Changes in lectin activity in plants treated with resistance inducers].

We studied the changes in lectin activity in tobacco leaf disc and potato tubers treated with polysaccharides (chitosan, glucomannan, and dextran sulfate), enzymes (cellulase and pectinase), or monosaccharides (glucose and glucosamine). All studied substances changed lectin activity to a certain extent(significantly or as a trend). The number of membrane lectins in the chloroplasts (tobacco leaf discs) usually considerably decreased immediately after the treatment (1-2 days) but increased later (2-4 days). Generally, an increased lectin activity predominated in potato tubers treated with the inducers. The enzymes increased lectin activity during the whole observation period (5 days). A pronounced antiviral activity was observed in the hypersensitive tobacco-tobacco mosaic virus system only after treatment with chitosan and glucomannan.