Chitosan induces jasmonic acid production leading to resistance of ripened fruit against Botrytis cinerea infection

•Chitosan inhibited the mycelial growth of Botrytis cinerea and protected the fruit quality.•Jasmonic acid (JA) biosynthesis-associated genes were up-regulated by chitosan in Botrytis cinerea-infected grapes.•TPR3 and HDAC19 were identified by data‐independent acquisition (DIA) measurement that changed in response to chitosan.•Chitosan and JA increased resistance to pathogenesis in ripened grape fruits through down-regulation of TPR3 and HDAC19.