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Many reports reveal that chitosan can induce tobacco’s resistance to tobacco mosaic virus, tobacco necrosis virus, and Phytophthora parasitica. For example, Falcon studied the effect of different sizes and DA of chitosan derivatives on tobacco protection against P. parasitica . The results of their experiment showed that different chitosans have distinct effects on this disease control, though less acetylated chitosan were better for inhibition of P. parasitica growth, partially acetylated chitosan.
It is the second most extended polysaccharide in nature after cellulose, forming part of microorganism cell walls, exoskeleton of insects and shells of crustaceans. Both chitin and its partially deacetylated form chitosan.