Proteinaceous Metabolites from Pyrenophora teres Contribute to Symptom Development of Barley Net Blotch

Pyrenophora teres, the causal agent of net blotch of barley (Hordeum vulgare L.), induces a combination of necrosis and extensive chlorosis in susceptible barley cultivars. Cell-free filtrates from both net and spot forms of P. teres; P. teres f. sp. teres, and P. teres f. sp. maculata were found to...

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Bibliographic Details
Published in:Phytopathology 2007-08, Vol.97 (8), p.907-915
Main Authors: Sarpeleh, A, Wallwork, H, Catcheside, D.E.A, Tate, M.E, Able, A.J
Format: Article
Language:English
Subjects:
barley
Biological and medical sciences
chlorosis
cultivars
Fundamental and applied biological sciences. Psychology
fungal diseases of plants
Fungal plant pathogens
genetic variation
Hordeum vulgare
leaves
metabolites
necrosis
pathogenesis-related proteins
pathogenicity
Phytopathology. Animal pests. Plant and forest protection
phytotoxins
plant pathogenic fungi
protein metabolism
Pyrenophora teres
Pyrenophora teres f. sp. maculata
Pyrenophora teres f. sp. teres
signs and symptoms (plants)
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Summary:Pyrenophora teres, the causal agent of net blotch of barley (Hordeum vulgare L.), induces a combination of necrosis and extensive chlorosis in susceptible barley cultivars. Cell-free filtrates from both net and spot forms of P. teres; P. teres f. sp. teres, and P. teres f. sp. maculata were found to contain phytotoxic low molecular weight compounds (LMWCs) and proteinaceous metabolites which appear to be responsible for different components of the symptoms induced by the two forms of the pathogen in a susceptible cultivar of barley (cv. Sloop). Proteins induced only brown necrotic spots or lesions similar to those induced by the pathogens 72 h after inoculation. In contrast, LMWCs induced general chlorosis seen 240 h after inoculation but not the localized necrosis. Neither hydrolyzed or heat- or protease-treated proteinaceous metabolites induced the symptoms. This is the first report of the involvement of proteins produced by P. teres in symptom development during net blotch disease of barley.
ISSN:0031-949X
1943-7684
DOI:10.1094/PHYTO-97-8-0907