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Chitosan oligomers prepared from enzyme hydrolysis of chitosan have for many years been recognized as potent elicitors of plant innate immunity, but their efficacy is limited by the degree of polymerization and the degree of acetylation. In this study, we presented a new type of chitosan oligomers (COS), with the name of quaternized chitosan oligomers (QCOS) that were prepared by reacting COS with...