Pathotypes of Cochliobolus sativus on barley in Australia

Meldrum, S. I.; Platz, GJ; Ogle, H. J.

doi:10.1071/ap03088

Cited by 25 publications

(16 citation statements)

References 7 publications

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“…This can be attributed to the genotype interactions and the operation of several genes for virulence in the pathosystem. The variation in the virulence of C. sativus is in agreement with that of Meldrum et al. (2000).…”

Section: Discussionsupporting

confidence: 77%

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Identification of Cochliobolus sativus (Spot Blotch) Isolates Expressing Differential Virulence on Barley Genotypes in Syria

Arabi¹,

Jawhar²

2004

Journal of Phytopathology

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Spot blotch, caused by Cochliobolus sativus, is a common foliar disease of barley. Information on the variability of virulence in C. sativus is essential for the production of spot-resistant barley cultivars. The virulence variability of isolates of this pathogen collected from different regions of Syria was evaluated using 10 differential barley genotypes originating from widely dispersed areas. Genotypes showed a continuous range of response from very susceptible to moderately resistant but none was immune to the disease. A cluster analysis indicated that the isolates had distinct differential virulence patterns within the three groups. A mean disease rating of 3.71 was the separation point between avirulent and virulent reactions. The data demonstrated that variation occurred in the virulence of and the resistance level to isolates and among genotypes, respectively. Isolate C41 exhibited distinct differential virulence patterns, high frequency and low variance in all genotypes. To incorporate adequate levels of resistance into future barley genotypes, disease evaluations should be made with C. sativus isolates that express the full spectrum of virulence found in Syria.

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Section: Discussionsupporting

confidence: 77%

“…Variation in barley resistance to spot blotch was reported by Wilcoxson et al. (1990), Fetch and Steffenson (1994) and by Meldrum et al. (2000).…”

Section: Introductionmentioning

confidence: 95%

Identification of Cochliobolus sativus (Spot Blotch) Isolates Expressing Differential Virulence on Barley Genotypes in Syria

Arabi¹,

Jawhar²

2004

Journal of Phytopathology

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“…Ex Dastur). This major foliar disease occurs in the warmer and more humid growing regions of the world, including North and South America, Europe, Asia, Syria and Australia (Steffenson et al 1996;Kumar et al 2002;Joshi et al 2004;Meldrum et al 2004;Müller et al 2005;Arabi and Jawhar 2007;Kuldeep et al 2008). As the perfect state does not play an important role in the epidemiology of the disease in Australia, the imperfect state is used when referring to the pathogen throughout this paper.…”

Section: Introductionmentioning

confidence: 99%

“…Knight et al (2010) screened 35 Australian spot blotch isolates across 15 barley cultivars and identified 10 apparent pathotypes. In an earlier study a differential set consisting of 20 lines was screened and six pathotypes were identified among 34 Australian isolates of the fungus (Meldrum et al 2004). Similarly, by using three barley differentials, three pathotypes were identified from 58 isolates obtained from different regions of the world (Zhong and Steffenson 2001) and eight virulence groups were identified in Canada by evaluating 127 isolates on 12 barley genotypes (Ghazvini and Tekauz 2007).…”

Section: Introductionmentioning

confidence: 99%

Mapping spot blotch resistance genes in four barley populations

et al. 2010

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Bipolaris sorokiniana (teleomorph: Cochliobolus sativus) is the fungal pathogen responsible for spot blotch in barley (Hordeum vulgare L.) and occurs worldwide in warmer, humid growing conditions. Current Australian barley varieties are largely susceptible to this disease and attempts are being made to introduce sources of resistance from North America. In this study we have compared chromosomal locations of spot blotch resistance reactions in four North American two-rowed barley lines; the North Dakota lines ND11231-12 and ND11231-11 and the Canadian lines TR251 and WPG8412-9-2-1. Diversity Arrays Technology (DArT)-based PCR, expressed sequence tag (EST) and SSR markers have been mapped across four populations derived from crosses between susceptible parental lines and these four resistant parents to determine the location of resistance loci. Quantitative trait loci (QTL) conferring resistance to spot blotch in adult plants (APR) were detected on chromosomes 3HS and 7HS. In contrast, seedling resistance (SLR) was controlled solely by a locus on chromosome 7HS. The phenotypic variance explained by the APR QTL on 3HS was between 16 and 25% and the phenotypic variance explained by the 7HS APR QTL was between 8 and 42% across the four populations. The SLR QTL on 7HS explained between 52 to 64% of the phenotypic variance. An examination of the pedigrees of these resistance sources supports the 1 Authors' accespted version of Bovill, Jessica and Lehmensiek, Anke and Sutherland, Mark and Platz, Greg and Usher, Terry and Franckowiak, Jerome and Mace, Emma (2010) Mapping spot blotch resistance genes in four barley populations. Molecular Breeding: new strategies in plant improvement, 26 (4). pp. 653-666. ISSN 1380653-666. ISSN -3743 doi: 10.1007 2 common identity of resistance in these lines and indicates that only a limited number of major resistance loci are available in current two-rowed germplasm.

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“…This method is time-consuming and several environmental interactions make it impossible to obtain error-free estimates (Duczek et al, 1985; Meldrum et al, 2004). In a previous work (Arabi and Jawhar, 1999) gibberellins technique for SCI elongation has been used for evaluating barley resistance to CRR pathogen.…”

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confidence: 99%

A Simple Method for Assessing Severity of Common Root Rot on Barley

Arabi

Jawhar

2013

The Plant Pathology Journal

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Common root rot caused by Cochliobolus sativus is a serious disease of barley. A simple and reliable method for assessing this disease would enhance our capacity in identifying resistance sources and developing resistant barley cultivars. In searching for such a method, a conidial suspension of C. sativus was dropped onto sterilized elongated subcrown internodes and incubated in sandwich filter paper using polyethylene transparent envelopes. Initial disease symptoms were easily detected after 48h of inoculation. Highly significant correlation coefficients were found in each experiment (A, B and C) between sandwich filter paper and seedling assays, indicating that this testing procedure was reliable. The method presented facilitates a rapid pre-selection under uniform conditions which is of importance from a breeder’s point of view.

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Pathotypes of Cochliobolus sativus on barley in Australia

Cited by 25 publications

References 7 publications

Identification of Cochliobolus sativus (Spot Blotch) Isolates Expressing Differential Virulence on Barley Genotypes in Syria

Identification of Cochliobolus sativus (Spot Blotch) Isolates Expressing Differential Virulence on Barley Genotypes in Syria

Mapping spot blotch resistance genes in four barley populations

A Simple Method for Assessing Severity of Common Root Rot on Barley

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