Variability in Virulence of<i>Aphanomyces euteiches</i>

Grau, C. R.; Muehlchen, Andrea; Tofte, J. E.; Smith, R. R.

doi:10.1094/pd-75-1153

Cited by 49 publications

(28 citation statements)

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“…The virulence phenotype of 148 isolates of A. euteiches was tested on Saranac, WAPH-1, and WAPH-5 alfalfa populations in greenhouse assays as described previously (Delwiche et al 1987;Fitzpatrick et al 1998;Grau et al 1991;Malvick and Grau 2001). Saranac is susceptible to all races of A. euteiches and was used to confirm pathogenicity.…”

Section: Pathogenicity and Virulence Phenotype Testingmentioning

confidence: 99%

“…Saranac is susceptible to all races of A. euteiches and was used to confirm pathogenicity. WAPH-1 is resistant to race 1 (R1) isolates and susceptible to race 2 (R2) isolates, and WAPH-5 is resistant to R1 and R2 isolates of A. euteiches (Fitzpatrick et al 1998;Grau 1992;Grau et al 1991;Malvick and Grau 2001). Zoospores were produced for inoculations from all isolates as described previously ).…”

Section: Pathogenicity and Virulence Phenotype Testingmentioning

confidence: 99%

“…1 Counties in Illinois (shaded) where A. euteiches was detected in alfalfa fields. These represent all 18 counties that were sampled in this study (Fitzpatrick et al 1998;Grau et al 1991;Malvick and Grau 2001;. Pots (5 cm) containing 5 day-old seedlings grown in vermiculite were flooded, inoculated with 500 zoospores/seedling, and kept saturated with water for 4 days after inoculation in a greenhouse at 22-26°C with a 14-h photoperiod.…”

Section: Pathogenicity and Virulence Phenotype Testingmentioning

confidence: 99%

“…This includes many states in the central US such as Illinois, where alfalfa is the third or fourthlargest crop based on land area in production. Isolates of A. euteiches that infect alfalfa in North America have been reported from 13 U.S. states and Quebec, Canada (Beghdadi et al 1992;Delwiche et al 1987;Grau et al 1991;Malvick 2002;Munkvold and Carlton 1995;Vincelli et al 1994). The isolates that were initially reported from alfalfa were designated race 1 (R1).…”

Section: Introductionmentioning

confidence: 99%

“…Host range of A. euteiches from alfalfa has been studied, although isolates from pea have been the focus of most host range studies (Delwiche et al 1987;Grau et al 1991;Papavizas and Ayers 1974;Richard and Martin 1991). Regional differences have been reported for the host range among isolates from pea fields.…”

Section: Introductionmentioning

confidence: 99%

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Population structure, races, and host range of Aphanomyces euteiches from alfalfa production fields in the central USA

2008

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Aphanomyces euteiches (races 1 and 2) causes root rot of alfalfa; however, its population biology and distribution are poorly understood where alfalfa is a major crop. The objectives of this study were to (1) characterise the distribution and frequency of races of A. euteiches in Illinois alfalfa fields, (2) determine host range of A. euteiches on cultivated and native legumes, and (iii) to describe genetic diversity and population genetic structure of A. euteiches in alfalfa fields. To accomplish this, soil samples (n= 103) were collected from 30 alfalfa fields in 18 Illinois counties. Using the susceptible cv. 'Saranac', 148 isolates of A. euteiches were baited from the soil. The virulence phenotype of isolates representing all 18 counties was tested, and 54% were R1 and 46% were R2. Both races were detected in 61% of the counties, whereas only R1 was detected in 22% and R2 in 17%. Thirteen legume hosts for isolates from alfalfa fields were identified based on symptoms and/ or production of oospores in roots. In addition to six previously known hosts, seven species were susceptible to infection: kura clover, purple prairie clover, white prairie clover, ladino clover, hairy vetch, Canadian milk vetch, and Illinois tick trefoil. AFLP analysis revealed high levels of genetic diversity among the isolates from different fields and counties and a lack of genetic structuring of populations based on race or geographical origin. The results suggest that populations of A. euteiches in alfalfa fields are diverse, often composed of races 1 and 2, and create risk for alfalfa and to multiple cultivated and native legume species.

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Section: Pathogenicity and Virulence Phenotype Testingmentioning

confidence: 99%

Section: Pathogenicity and Virulence Phenotype Testingmentioning

confidence: 99%

Section: Pathogenicity and Virulence Phenotype Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Population structure, races, and host range of Aphanomyces euteiches from alfalfa production fields in the central USA

2008

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Aphanomyces euteiches and Legumes

Gaulin

Bottin

Jacquet

et al. 2008

Oomycete Genetics and Genomics

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Population Biology of Fungal Plant Pathogens

Atallah

Subbarao

2011

Plant Fungal Pathogens

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Studies of the population genetics of fungal and oomycetous phytopathogens are essential to clarifying the disease epidemiology and devising management strategies. Factors commonly associated with higher organisms such as migration, natural selection, or recombination, are critical for the building of a clearer picture of the pathogen in the landscape. In this chapter, we focus on a limited number of experimental and analytical methods that are commonly applied in population genetics. At first, we present different types of qualitative and quantitative traits that could be identified morphologically (phenotype). Subsequently, we describe several molecular methods based on dominant and codominant markers, and we provide our assessment of the advantages and shortfalls of these methods. Third, we discuss various analytical methods, which include phylogenies, summary statistics as well as coalescent-based methods, and we elaborate on the benefits associated with each approach. Last, we develop a case study in which we investigate the population structure of the fungal phytopathogen Verticillium dahliae in coastal California, and assess the hypotheses of transcontinental gene flow and recombination in a fungus that is described as asexual.

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Variability in Virulence ofAphanomyces euteiches

Cited by 49 publications

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Population structure, races, and host range of Aphanomyces euteiches from alfalfa production fields in the central USA

Population structure, races, and host range of Aphanomyces euteiches from alfalfa production fields in the central USA

Aphanomyces euteiches and Legumes

Population Biology of Fungal Plant Pathogens

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