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Abstract

To explore the antifungal activity and potential mechanism of p-Hydroxybenzoic acid against Colletotrichum gloeosporioides in postharvest Citrus. The addition of p-HBA in-vitro and in-vivo was conducted to test the inhibitory effect. Dynamic changes of peroxidase (POD), polyphenoloxidase(PPO), Superoxide Dismutase (SOD), Ammonia-lyase (PAL)activity and the content of Malondialdehyde(MDA) with different treatment was studied in postharvest citrus. p-HBA displayed strong antifungal activity to C.gloeosporioides,when the concentration was higher, the effect was increased. The value of EC50 is 0.056 mg/mL. The activities of PPO, POD, SOD and PAL were increased when inoculated with p-HBA and C.gloeosporioides, while the content of MDA was decreased. p-Hydroxybenzoic acid has a strong antimicrobial activity, which can induce the increase of defending enzyme’s activity and decrease the peroxidation of membrane lipid, The significance obviously is there for citrus fresh-keeping.

Publication Date

9-28-2016

First Page

121

Last Page

125,208

DOI

10.13652/j.issn.1003-5788.2016.09.031

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