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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

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Abstract

Bipolaris sorokiniana (teleomorph: Cochliobolus sativus), the causal agent of common rootrot (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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Authors and Affiliations

  1. Centre for Systems Biology, Faculty of Sciences, University of Southern Queensland, 4350, Toowoomba, Qld, Australia

    N. L. Knight, A. Lehmensiek & M. W. Sutherland

  2. Hermitage Research Station, Queensland Primary Industries and Fisheries, Department of Employment, Economic Development and Innovation, 4370, Warwick, Qld, Australia

    G. J. Platz

Authors
  1. N. L. Knight
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  2. G. J. Platz
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  3. A. Lehmensiek
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  4. M. W. Sutherland
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Correspondence to M. W. Sutherland.

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Knight, N.L., Platz, G.J., Lehmensiek, A. et al. 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 Pathol. 39, 207–216 (2010). https://doi.org/10.1071/AP09082

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  • DOI: https://doi.org/10.1071/AP09082

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