Five Plant Natural Products Are Potential Type III Secretion System Inhibitors to Effectively Control Soft-Rot Disease Caused by

Overview

Journal Front Microbiol

Specialty Microbiology

Date 2022 Mar 11

PMID 35273588

Authors

Anqun Hu

Ming Hu

Shanshan Chen

Yang Xue

Xu Tan

Jianuan Zhou

Affiliations

Soon will be listed here.

Abstract

, a plant soft-rot pathogen, possesses a type III secretion system (T3SS) as one of the major virulence factors, infecting a wide variety of monocotyledonous and dicotyledonous plants and causing serious losses to the production of economic crops. In order to alleviate the problem of pesticide resistance during bacterial disease treatment, compounds targeting at T3SS have been screened using a bioreporter. After screening by Multifunctional Microplate Reader and determining by flow cytometer, five compounds including salicylic acid (SA), p-hydroxybenzoic acid (PHBA), cinnamyl alcohol (CA), p-coumaric acid (PCA), and hydrocinnamic acid (HA) significantly inhibiting promoter activity without affecting bacterial growth have been screened out. All the five compounds reduced hypersensitive response (HR) on non-host tobacco leaves and downregulated the expression of T3SS, especially the master regulator encoding gene . Inhibition efficacy of the five compounds against soft rot were also evaluated and results confirmed that the above compounds significantly lessened the soft-rot symptoms caused by 3937 on potato, CL3 on taro, EC1 on rice, and MS2 on banana seedlings. Findings in this study provide potential biocontrol agents for prevention of soft-rot disease caused by spp.

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