Influence of Chitosan Hybrid Derivatives on Induced Wheat Resistance to Pathogens with Different Nutrition Strategies

Resumo

The effect of immune modulators based on chitosan, vanillin, and salicylic acid on wheat resistance to brown rust (Puccinia recondita) and dark brown spot (Cochliobolus sativus) was studied. It has been established that chitosan and modified salicylic acid increases the resistance of wheat to both pathogens, whereas chitosan containing vanillin effectively induces resistance only to the hemibiotroph of C. sativus. The molar ratio of vanillin and salicylic acid (1: 1–1: 2) in hybrid immune modulators was determined to obtain high inducing activity with respect to the biotroph of P. recondita and the hemibiotroph of C. sativus. When a relationship between wheat and hemibiotroph C. sativus forms, a direct relationship is observed between the activity of antioxidant enzymes and the intensification of disease development.