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Induction of resistance in host against the infection of leaf blight pathogen (Alternaria palandui) in onion (Allium cepa var aggregatum)

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Title Induction of resistance in host against the infection of leaf blight pathogen (Alternaria palandui) in onion (Allium cepa var aggregatum)
 
Creator Karthikeyan, M
Jayakumar, V
Radhika, K
Bhaskaran, R
Velazhahan, R
Alice, D
 
Subject Leaf blight
Onion
Alternaria palandui
Pseudomonas fluorescens
Induced systemic resistance
Defense-related proteins
Chitinase
β-1,3 glucanase
Peroxidase
Polyphenol oxidase
 
Description 371-377
The Pseudomonas fluorescens isolate Pf1 was found to inhibit the growth of pathogen Alternaria palandui, in vitro. In the present study, foliar application of a talc-based formulation of Pf1 significantly reduced the incidence of leaf blight of onion, caused by A. palandui. Induction of defense-related proteins viz., chitinase, β-1,3 glucanase, peroxidase (PO) and polyphenol oxidase (PPO) by application of Pf1, was studied against A. palandui infection in resistant (IHR 56) and susceptible (MDU1) onion cultivars. Chitinase in both cultivars, with or without challenge-inoculation of A. palandui revealed changes in the isoform pattern. The Native-PAGE of PO showed induction of PO2 isoform in both the cultivars, in response to inoculation of pathogen. Isoform analysis of PPO also exhibited induction in the Pf1-treated plants challenged with pathogen. Similarly, the activity of β-1,3-glucanase was greatly induced in Pf1-treated plants, challenged with pathogen as compared to controls. Thus, the P. fluorescens-treated plants showed significant increase in the levels of the defense enzymes, in comparison to the plants challenged with the pathogen.
 
Date 2009-03-30T09:07:07Z
2009-03-30T09:07:07Z
2005-12
 
Type Article
 
Identifier 0301-1208
http://hdl.handle.net/123456789/3544
 
Language en_US
 
Relation C12R1/39, C12Q1/28
 
Publisher CSIR
 
Source IJBB Vol. 42(6) [December 2005]