Arginine induces the resistance of postharvest jujube fruit against <i>Alternaria</i> rot

Abstract In order to explore the effects of arginine (Arg) treatment on postharvest rot jujube caused by Alternaria alternata (A. alternata), winter was treated with different concentrations Arg (0, 20, 200, and 1000 μmol/L). Results showed that substantially inhibited expansion lesion diameter, jujubes 200 μmol/L had smallest diameter. vitro experiments demonstrated could not inhibit spore germination mycelial growth A. alternata. Further experimental results reduced production rate O2–. H2O2 content improved activities superoxide dismutase, catalase, peroxidase, ascorbate peroxidase in comparison control; enhanced chitinase β-1,3-glucanase. Furthermore, significantly increased activity phenylalamine ammonia lyase contents flavonoids, phenolics, lignin. indicated that, although directly pathogenic fungi as a fungicide, it can induce resistance maintaining balance reactive oxygen species, increasing pathogenesis-related protein, promoting phenylpropane metabolism fruit tissue. Therefore, be novel measure for inducing rot.