Races of<i>Phytophthora sojae</i>in Argentina and Reaction of Soybean Cultivars

Barreto, D.; Gurfinkel, Beatriz Stegman De; Fortugno, C.

doi:10.1094/pd-79-0599

Cited by 22 publications

(17 citation statements)

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“…In South America, PRR was first described in Argentina in 1970 (Barreto et al 1995) and in Brazil in 1995 (Costamilan et al 2010). Occurrence of the disease remained insignificant and no practical control measures were utilized to manage PRR in Brazil until the 2005/2006 growing season, when great losses were first observed in Rio Grande do Sul and Paraná states (Costamilan et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Numerous surveys for pathotype composition of P. sojae populations have been carried out primarily in the USA Yang et al 1996;Leitz et al 2000;Kaitani et al 2001;Dorrance et al 2003;Jackson et al 2004;Malvick and Grunden 2004;Nelson et al 2008), as well as in Argentina (Barreto et al 1995;Gally et al 2007), and Australia (Ryley et al 1998). Only the differential with Rps7 had a susceptible reaction (Costamilan et al 2010) to one isolate from Passo Fundo, RS, in the first study about pathogenicity of P. sojae in Brazil.…”

Section: Introductionmentioning

confidence: 99%

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Pathogenic diversity of Phytophthora sojae pathotypes from Brazil

et al. 2012

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Phytophthora root and stem rot has developed in commercial soybean fields since 2006 in Brazil, and cultivars with resistance to this disease have not been targeted for this region. Thus, the Phytophthora sojae pathotypes are expected to have virulence to few if any of the Rps genes. The objectives of this study were to characterize the pathotype diversity of P. sojae in Brazil, determine the distribution of the pathogen and predict which Rps genes will be effective and should be used in breeding programs. Isolates were collected in six states (Rio Grande do Sul, Santa Catarina, Paraná, Mato Grosso do Sul, Minas Gerais, and Goiás). The virulence formulae were based on the response of a differential set with 14 Rps genes (1a, 1b, 1c, 1d, 1k, 2, 3a, 3b, 3c, 4, 5, 6, 7, and 8). None of the 17 pathotypes found was reported previously. The most common virulence formulas were: 1d, 2, 3c, 4, 5, 6, 7 (octal code 05471, representing 24 % of the occurrences); 1d, 2, 3b, 3c, 4, 5, 6, 7 (05671, 13 %); 1b, 1d, 2, 3a, 3c, 4, 5, 6, 7 (25571, 8 %); and 1d, 3a, 5, 7, 8 (01123, 8 %). Percentages of isolates with a susceptible interaction with each Rps gene was Rps1a (3 %), Rps1b (11 %), Rps1c (3 %), Rps1d (100 %), Rps1k (3 %), Rps2 (86 %), Rps3a (32 %), Rps3b (19 %), Rps3c (73 %), Rps4 (70 %), Rps5 (89 %), Rps6 (59 %), Rps7 (100 %), and Rps8 (22 %). There was apparently no relationship between pathotypes and origin. Stacking resistance genes Rps1a, Rps1b, Rps1c, and Rps1k with Rps3b or Rps8 would be highly effective for soybean cultivars targeted for Brazil.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pathogenic diversity of Phytophthora sojae pathotypes from Brazil

et al. 2012

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“…The reaction types of the SZIs were evaluated 4–5 days after inoculation. The disease responses of the differentials were evaluated as described by Barreto et al. (1995).…”

Section: Methodsmentioning

confidence: 99%

“…The reaction types of the SZIs were evaluated 4-5 days after inoculation. The disease responses of the differentials were evaluated as described by Barreto et al (1995). A differential was classified as susceptible, if >70% of the seedlings died and resistant, if <30% of the seedlings were killed.…”

Section: Virulence Assessmentmentioning

confidence: 99%

“…The organism is diploid and homothallic. This disease has been identified in almost all soybean‐growing regions worldwide, such as Argentina, Australia, Brazil, Canada, Hungary, Italy, Russia, and the United States (Barreto et al., 1995; Meng et al., 1999). Beside root rot, the pathogen can also cause stem rot as well as pre and postemergence damping off.…”

Section: Introductionmentioning

confidence: 99%

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Diversity among Single Zoospore Isolates Derived from Single‐zoosporangia of Phytophthora sojae Kauf. and Gerd

Chen¹,

Huang²,

Buchenauer³

et al. 2009

Journal of Phytopathology

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Phytophthora sojae Kauf. and Gerd, a host specific pathogen to soybean, causes pre and postemergence damping‐off and root and stem rot on soybean. The pathogen evokes severe yield losses in most soybean growing areas worldwide. The objective of this study was to determine phenotypic and genotypic diversity among single zoospore isolates (SZIs) originating from two single zoosporangia (Ps411‐1 and Ps411‐2) derived from the same parental isolate of P. sojae Ps411. Results showed that colony morphology and growth rate of 32 SZIs derived from sporangium Ps411‐1 and 35 SZIs released from sporangium Ps411‐2 did not significantly differ from the parental isolate Ps411. Pathogenicity of the SZIs was tested on three resistant and three susceptible Chinese soybean cultivars. While the majority of SZIs derived from sporangium Ps411‐1(59.4%) and sporangium Ps411‐2(71.4%) retained the same virulence spectrum as the parental isolate, the other SZIs of both progenies demonstrated either a higher or a lower level of virulence compared to that of parental isolate. A low level genetic variability in the populations of both single zoospore progenies was also demonstrated using the sequence‐related amplified polymorphism (SRAP) technique. Cluster analysis separated the SZIs from both zoosporangia, Ps411‐1 and Ps411‐2, into four and three SRAP groups, respectively. No close correlation among SRAP and virulence could be established among SZIs. The results of this study suggest that virulence variability may be regarded as part of the total genetic changes among the zoospore progenies derived from single‐zoosporangia. The pathogenic variability during asexual reproduction may play a role in changing the virulence structure of P. sojae.

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Oomycete Genetics and Genomics

Lamour¹,

Kamoun²

2008

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Races ofPhytophthora sojaein Argentina and Reaction of Soybean Cultivars

Cited by 22 publications

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Pathogenic diversity of Phytophthora sojae pathotypes from Brazil

Pathogenic diversity of Phytophthora sojae pathotypes from Brazil

Diversity among Single Zoospore Isolates Derived from Single‐zoosporangia of Phytophthora sojae Kauf. and Gerd

Oomycete Genetics and Genomics

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