Control of Phytophthora nicotianae disease, induction of defense responses and genes expression of papaya fruits treated with Pseudomonas putida MGP1. (30th August 2012)

• Record Type: Journal Article
• Authors: Shi, Jingying; Liu, Aiyuan; Li, Xueping; Chen, Weixin
• Is Part Of: Journal of the science of food and agriculture. Volume 93:Number 3(2013:Feb. 15)
• Page Start: 568
• Page End: 574
• Publication Date: 2012-08-30
• Subjects: Food -- Periodicals; Agriculture -- Periodicals; 664
• DOI: 10.1002/jsfa.5831
• Languages: English
• ISSNs: 0022-5142

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p> <bold>BACKGROUND: Biological control is a potential strategy to reduce post‐harvest decay in several fruits. Little research has been carried out on the effects of endophytic bacterium on post‐harvest blight caused by <italic>Phytophthora nicotianae</italic> in papaya. In this work, the biocontrol activity of <italic>Pseudomonas putida</italic> MGP1 on this disease and its possible mechanisms, including changes of defensive enzyme activities, total phenolic content and mRNA levels of two important genes, were investigated.</bold> </p> <p> <bold>RESULTS: Fruits treated with MGP1 showed a significant lower disease index and demonstrated increases in chitinase, β‐1, 3‐glucanase, phenylalanine ammonia‐lyase, peroxidase, polyphenol oxidase and catalase activities and total phenolic content. In addition, the expression levels of pathogenesis related protein 1 gene (<italic>PR1</italic>) and non‐expressor of <italic>PR1</italic> gene (<italic>NPR1</italic>) in papaya fruits were elevated by MGP1 treatment.</bold> </p> <p> <bold>CONCLUSION The results indicated that papaya fruits were responsive to the endophytic bacterium <italic>Ps. putida</italic>, which could activate defensive enzymes and genes and thereby induce host disease resistance. © 2012 Society of Chemical Industry</bold> </p> </abstract>