Twelve<i>Pyrenophora trichostoma</i>Races for Virulence to Wheat in the Central Plains of North America

Luz, W. C. da; Hosford, R. M.

doi:10.1094/phyto-70-1193

Cited by 46 publications

(10 citation statements)

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“…The symptom-based pathotype classification is limited to four broad categories: pathotype 1 induces both necrosis and chlorosis, pathotype 2 induces necrosis only, pathotype 3 induces chlorosis only, and pathotype 4 fails to induce any symptoms. The ability of the pathogen to generate new virulence, as evidenced by the physiologic variation reported in many parts of the world (Krupinsky 1992;da Luz and Hosford 1980;Misra and Singh 1972) suggests that additional virulence types may exist within the pathotype based classification. Lamari et al (1995) identified isolates collected from Algeria that induced chlorosis, similar to pathotype 3, but reacted differently on the differential set of cultivars.…”

Section: Pathogenic Variabilitymentioning

confidence: 99%

“…In addition to the race based classification of isolates of P. tritici-repentis, studies have indicated variation in aggressiveness among isolates based on disease severity, lesion number, lesion size and percentage leaf area infected (Krupinsky 1992;da Luz and Hosford 1980;SchiIder and Bergstorm 1990;Sah and Fehrman 1992). Molecular studies ; Singh and Hughes 2006b) reveal high genetic variation among strains of P. tritici-repentis and the presence of frequent sexual reproduction further enhances the potential for recombination and selection of new races of P. tritici-repentis.…”

Section: Pathogenic Variabilitymentioning

confidence: 99%

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Genetics of wheat–Pyrenophora tritici-repentis interactions

Singh

Duveiller

et al. 2009

Euphytica

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Tan spot, caused by an ascomycete fungus Pyrenophora tritici-repentis, is one of the most devastating foliar diseases of wheat. This fungus induces two distinct symptoms, tan necrosis and extensive chlorosis, on susceptible wheat cultivars. Besides causing average yield losses of 5-10%, tan spot also causes significant losses in grain quality by grain shriveling, red smudge, and black point. Conservation agriculture in combination with wheat monoculture involving cultivation of susceptible cultivars has resulted in frequent onset of tan spot epidemics worldwide. Development of new resistant wheat cultivars, in conjunction with crop rotation, will provide an effective, economical, and environmentally safe means of controlling tan spot. Presently, eight races of P. tritici-repentis have been identified worldwide based on the ability to induce necrosis and chlorosis symptoms on a set of differential wheat cultivars. P. tritici-repentis is a homothallic fungus having both sexual and asexual reproduction resulting in high genetic diversity worldwide. Both quantitative and qualitative mode of inheritance for resistance to tan spot of wheat has been reported. The tan spot fungus produces multiple host-specific toxins and host resistance is highly correlated to insensitivity to toxins. Genetic studies have further confirmed that wheat-P. tritici-repentis follows the toxin model of gene-for-gene hypothesis although other mechanism of host-pathogen interaction may exist and exploitation of all resistance phenomenon is to be adopted to develop durable resistant cultivars.

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Section: Pathogenic Variabilitymentioning

confidence: 99%

Section: Pathogenic Variabilitymentioning

confidence: 99%

Genetics of wheat–Pyrenophora tritici-repentis interactions

Singh

Duveiller

et al. 2009

Euphytica

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“…Variability among P. tritici-repentis populations was demonstrated by several workers around the world (Ali and Francl, 1998; Ali et al, 2010; Benslimane et al, 2013; da Luz and Hosford, 1980; dos Santos et al, 2002; Friesen et al, 2005; Lamari and Bernier, 1989, 1991; Leisová et al, 2008; Misra and Singh, 1972; Moreno et al, 2008; Schilder and Bergstrom, 1990; Singh and Hughes, 2006). Studying variability within the population in a geographical region is important because it documents the changes occurring in the population.…”

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confidence: 91%

In Vitro Morphological Characteristics of Pyrenophora tritici-repentis Isolates from Several Algerian Agro-Ecological Zones

Benslimane¹,

Aouali

Khalfi

et al. 2017

The Plant Pathology Journal

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Tan spot caused by the fungus Pyrenophora triticirepentis is a serious disease of wheat, which is on increase in recent years in Mediterranean region. In the field this fungus produces a diamond-shaped necrotic lesions with a yellow halo on wheat foliage. The objective of this study was to characterize and compare several monospore isolates of P. tritici-repentis collected from different infected wheat fields in various locations of Algeria, and find the morphological differences between them, if any. The results revealed wide morphologically variation among the isolates based on colony colors and texture, mycelial radial growth and conidial size.

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“…The fungus P. tritici-repentis is the causal agent of tan spot of wheat, an economically significant disease that has been reported worldwide and may account for yield losses ranging from 2 to 40% (da Luz and Hosford, 1980;Shabeer et al, 1991;Sykes and Bernier, 1991). Certain isolates of P. tritici-repentis have been shown to produce in culture an HST that induces typical tan spot necrosis upon infiltration into tissue of susceptible wheat cultivars.…”

Section: Introductionmentioning

confidence: 99%

A single gene encodes a selective toxin causal to the development of tan spot of wheat.

1997

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The identification and characterization of pathogenicity factors are essential to an understanding of the molecular events that regulate the interaction of plant-pathogenic microbes with their hosts. We have isolated the gene that encodes a host-selective toxic protein produced by the fungus Pyrenophora tritici-repentis and confirmed that this gene functions in the plant as the primary determinant of pathogenicity in the Pyrenophora-wheat interaction. These results demonstrate that a single gene encodes the production of a host-selective toxin and that transformation of this gene into a non-toxin-producing isolate of P. tritici-repentis leads to both toxin production and pathogenicity.

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TwelvePyrenophora trichostomaRaces for Virulence to Wheat in the Central Plains of North America

Cited by 46 publications

References 0 publications

Genetics of wheat–Pyrenophora tritici-repentis interactions

Genetics of wheat–Pyrenophora tritici-repentis interactions

In Vitro Morphological Characteristics of Pyrenophora tritici-repentis Isolates from Several Algerian Agro-Ecological Zones

A single gene encodes a selective toxin causal to the development of tan spot of wheat.

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