<i>Phakopsora pachyrhizi</i>, the causal agent of Asian soybean rust

Goellner, Katharina; Loehrer, Marco; Langenbach, Caspar; Conrath, Uwe; Koch, Eckhard; Schaffrath, Ulrich

doi:10.1111/j.1364-3703.2009.00589.x

Cited by 182 publications

(192 citation statements)

References 57 publications

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“…Inicialmente, o fungo causa lesões pequenas, de cor castanha a marrom escura, próximas às nervuras das folhas (Goellner et al, 2010). Depois de cinco a oito dias, ocorre o aumento das lesões e o amarelecimento do tecido foliar com o desenvolvimento de pústulas, principalmente na face abaxial das folhas, além da liberação de uredósporos pelas urédias (Goellner et al, 2010). Sob ataque severo do fungo ocorre a desfolha da planta, o que causa redução no número de vagens e grãos (Hirano et al, 2010).…”

Section: Palavras-chaveunclassified

Aplicação de fungicidas na soja baseada na detecção de uredósporos de Phakopsora pachyrhizi

2014

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Para estabelecer o momento adequado da aplicação de fungicidas no manejo da ferrugem asiática da soja (FAS), avaliou-se a época da pulverização dos fungicidas epoxiconazole e piraclostrobina (FEP) com base na detecção de uredósporos de Phakopsora pachyrhizi (PP) em condições de campo na área experimental da Faculdade Integrado de Campo Mourão, no Paraná, na safra verão de 2009/2010. O delineamento experimental foi realizado em blocos ao acaso, com sete tratamentos e quatro repetições, sendo: 1) aplicação do FEP com umidade acima de 80%; 2-5) aplicação do FEP 1-2, 6-7, 11-12 e 18-20 dias após a detecção dos primeiros esporos de PP, respectivamente; 6) aplicação do FEP após a detecção dos primeiros sintomas da FAS; 7) aplicação do FEP no estádio R1. A testemunha foi composta por plantas não tratadas com FEP. Houve redução da severidade da FAS em todos os tratamentos. Os valores da área abaixo da curva de progresso da FAS (AACPFA), taxa de progresso da doença (r) e severidade máxima (Y max ) na testemunha foram de 520,31; 0,06 e 45,65%, respectivamente. Foram detectados os menores valores de AACPFA (39,73), r (0,02) e Y max (3,91%) no tratamento 1. No entanto, o maior número de pulverizações do FEP foi realizado neste tratamento, com quatro aplicações. No tratamento 4, houve duas aplicações. Registrou-se a menor produtividade na testemunha (2085 kg. ha-1). A maior produtividade foi obtida nos tratamentos 1, 2, 3, 4, 6 e 7, acima de 3000 kg ha-1. Além disso, registrou-se o menor valor da massa de mil grãos na testemunha. Os maiores valores foram obtidos nos tratamentos 1, 2, 3 e 6. Portanto, a época de aplicação de fungicida baseada na detecção de uredósporos de PP é eficiente no manejo da FAS.

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Section: Palavras-chaveunclassified

Aplicação de fungicidas na soja baseada na detecção de uredósporos de Phakopsora pachyrhizi

2014

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“…d) Asexual reproduction of P. pachyrhizi is completed by generating novel uredospores in uredosori. sp, uredospore; app, appressorium; hau, haustorium; hmc, haustorial mother cell; modified from (Goellner et al, 2010).…”

Section: Pathogen Life-cycle and Host Rangementioning

confidence: 99%

“…However these data have been generated under laboratory conditions and field test have not been performed yet. It seems questionable, therefore, whether biological control could substitute chemical disease control or substantially contribute to its effectiveness (Goellner et al, 2010). Since the source for the initial P. pachyrhizi inoculum at the start of the growing season comes from the immigrant weed kudzu, reducing the density of this weed host may help.…”

Section: Breeding For Disease Resistance and Other Disease Managementmentioning

confidence: 99%

Asian Soybean Rust – Meet a Prominent Challenge in Soybean Cultivation

Loehrer¹,

Schaffrath²

2011

Soybean - Biochemistry, Chemistry and Physiology

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“…In Brazil, ASR was first reported in 2001 in the State of Rio Grande do Sul (Yorinori and Lazzarotto, 2004). Due to the rapid dispersal of its spores by wind and increased human mobility, ASR is currently found in all soybean-producing areas in Brazil (Freire et al, 2008;Goellner et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…In general, "TAN" lesions have two to five uredias at lesion, whereas "RB" lesions have zero to two. There is also an immunity with flecks reaction ("IF"), in which no macroscopic symptoms of the disease are observed (Goellner et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Identification and mapping of resistance genes to Phakopsora pachyrhizi in soybean (Glycine max L.) accession PI 594767-A

Rocha¹,

Alves²,

Oliveira³

et al. 2016

Genet. Mol. Res.

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ABSTRACT. The goal of this study was to study resistance inheritance in the soybean (Glycine max L.) accession PI 594767-A to the Phakopsora pachyrhizi isolate PPUFV02, and map the resistance gene(s) identified using microsatellite markers. Crosses between PI 594767-A and the susceptible cultivar 'Conquista' gave rise to the segregating subpopulations 26C-2 and 26C-5, which in the F 2 generation were evaluated for their reactions to PPUFV02. In addition, analyses with microsatellite markers linked to the Rpp1-Rpp5 loci were also performed. The segregation pattern obtained in 26C-2 revealed that resistance was governed by a recessive gene; a 1:2:1 segregation pattern was observed in 26C-5, indicating control by a gene with partial dominance. This variability may have been caused because environmental conditions, particularly temperature, when 26C-5 was assessed were unfavorable for pathogen development, allowing the phenotypic expression of heterozygous alleles in PI 594767-A. A resistance gene was located in the soybean linkage group G, in the genomic region between Sct_187r2 and Sat_064 that contains the Rpp1 locus. Resistance in PI 594767-A is probably conferred by a new Rpp1 gene allele, because this accession has a haplotype for Sct_187r2 and Sat_064, which differs from haplotypes of accessions that also contain resistance alleles that map the Rpp1 locus. The use of Sct_187r2 and Sat_064 will facilitate the introgression of the resistance allele from PI 594767-A and its pyramiding with other resistance genes into genotypes with superior agronomic characteristics, in order to obtain cultivars with broad-spectrum resistance to P. pachyrhizi.

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Phakopsora pachyrhizi, the causal agent of Asian soybean rust

Cited by 182 publications

References 57 publications

Aplicação de fungicidas na soja baseada na detecção de uredósporos de Phakopsora pachyrhizi

Aplicação de fungicidas na soja baseada na detecção de uredósporos de Phakopsora pachyrhizi

Asian Soybean Rust – Meet a Prominent Challenge in Soybean Cultivation

Identification and mapping of resistance genes to Phakopsora pachyrhizi in soybean (Glycine max L.) accession PI 594767-A

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