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An Improved Detached-Leaf Assay for Phenotyping Net Blotch of Barley Caused by Pyrenophora teres

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El-Mor, I. M., Fowler, R. A., Platz, G. J., Sutherland, M. W. and Martin, A. (2017) An Improved Detached-Leaf Assay for Phenotyping Net Blotch of Barley Caused by Pyrenophora teres. Plant Disease, 102 (4). pp. 760-763. ISSN 0191-2917

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Article Link: https://doi.org/10.1094/PDIS-07-17-0980-RE


Net blotch, caused by Pyrenophora teres, is a major barley (Hordeum vulgare) leaf disease worldwide. P. teres occurs as two forms—P. teres f. teres, and P. teres f. maculata—inducing net and spot-like symptoms, respectively. An intact-seedling assay, where entire seedlings are inoculated by spraying with a conidial suspension, is frequently used for phenotyping net blotch. However, this presents a biosecurity risk in the glasshouse when nonlocal isolates are being screened. Alternatively, a detached-leaf assay (DLA-droplet method) can be used in which leaf segments laid out in a covered tray are inoculated with droplets of a conidial suspension, confining the inoculum. However, using this method, net and spot form symptoms cannot be distinguished from each other. We have developed an improved DLA (DLA-spray method) in which detached whole leaves are sprayed with the inoculum to produce distinct lesions. We compare the results for the three phenotyping methods above using four isolates from both net and spot forms of the disease to inoculate a standard set of eight barley genotypes. Results indicate that the DLA-spray method is a functional, informative and rapid test that readily differentiates the two forms of the pathogen in a biosecure environment.

Item Type:Article
Business groups:Crop and Food Science
Subjects:Plant culture > Field crops > Barley
Plant pests and diseases > Plant pathology
Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Live Archive:20 Nov 2018 03:41
Last Modified:03 Sep 2021 16:44

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