An investigation of genetic variation among Australian isolates of Bipolaris sorokiniana from different cereal tissues and comparison of their abilities to cause spot blotch on barley

Knight, N. L. and Platz, G. J. and Lehmensiek, A. and Sutherland, M. W. (2010) An investigation of genetic variation among Australian isolates of Bipolaris sorokiniana from different cereal tissues and comparison of their abilities to cause spot blotch on barley. Australasian Plant Pathology, 39 (3). pp. 207-216. ISSN 0815-3191

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Abstract

Bipolaris sorokiniana (teleomorph: Cochliobolus sativus), the causal agent of common root rot (CRR) and foliar spot blotch (SB) diseases in barley and wheat, is an economically important fungal pathogen worldwide. However, the relationship between these two diseases is poorly understood. Differences within Australian B. sorokiniana populations were revealed by cluster analysis of amplified fragment length polymorphisms in genomic DNA of 48 B. sorokiniana isolates collected from the northern grain-growing region of Australia. Isolates collected from SB infections clustered apart from isolates collected from CRR infections. A subset of 31 B. sorokiniana isolates was assessed for their abilities to cause SB infections on barley leaves using a differential set of 15 barley genotypes and three other cereal species. The pathogen samples included 14 isolates from CRR infections of either wheat or barley and 14 isolates from SB infections of barley. Phenotypic experiments revealed that isolates of B. sorokiniana collected from barley SB infections showed a high level of pathogenic variability across the differential set. In contrast, isolates from CRR infections produced significantly less SB disease on inoculated barley leaves. Cluster analysis of the phenotypic infection response scores grouped isolates into three pathogenicity clusters demonstrating low, intermediate or high pathogenicity. The results of this study suggest divergence within Australian populations of B. sorokiniana in relation to host tissue specificity.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version deposited in accordance with the copyright policy of the publisher (CSIRO Publishing).
Depositing User: Mrs Julie-Anne Christensen
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 02 Oct 2010 08:28
Last Modified: 02 Jul 2013 23:53
Uncontrolled Keywords: barley; wheat; plant disease
Fields of Research (FOR2008): 06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
06 Biological Sciences > 0605 Microbiology > 060505 Mycology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: doi: 10.1071/AP09082
URI: http://eprints.usq.edu.au/id/eprint/8038

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