Intensidade da ferrugem asiática (Phakopsora pachyrhizi H. Sydow &amp; P. Sydow) da soja [Glycine max (L.) Merr.] nas cultivares Conquista, Savana e Suprema sob diferentes temperaturas e períodos de molhamento foliar

Alves, Marcelo de Carvalho; Pozza, Edson Ampélio; Ferreira, Josimar Batista; Araujo, Dejania De De Viera; Costa, João de Cássia do Bomfim; Deuner, Carolina Cardoso; Muñiz, Mariano; Zambenedetti, Elizandra Batista; Machado, José da Cruz

doi:10.1590/s0100-54052007000300005

Cited by 17 publications

(14 citation statements)

References 13 publications

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“…According to Alves et al (2007) Regarding leaf wetness duration, Veiga (1973) found that a 48-h wet period can result in infection, much as we observed, although we also found that the highest disease intensity occurs within a 72-h period. Kudo et al (2011), showed that a 72-h wet period after C. sojina inoculation was sufficient to generate enough disease intensity for soybean genotype screening, a result that closely resembled those by Scandiani et al (2010).…”

Section: °Csupporting

confidence: 70%

The combined effects of temperature and leaf wetness periods on soybean frogeye leaf spot intensity

Câmera

Ghissi

Reis³

et al. 2016

Sem. Ci. Agr.

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The frogeye leaf spot, a disease caused by the fungus Cercospora sojina, affects soybean crops worldwide with enormous economic impact. In this study, we evaluated the combined effects of temperature and duration of leaf wetness periods on the intensity of frogeye leaf spot in soybean. Experiments were conducted in a growth chamber with cultivar Don Mario 7.0i at temperatures of 15, 20, 25, 30 and 35°C and leaf wetness periods of 12, 24, 36, 48 and 72 hours. The experimental design was completely randomized with five replications. When soybean plants were grown at 15°C, affected leaflet area, number of lesions per leaflet and diameter of lesions could only be measured after 60 hours of leaf wetness. At the temperatures of 20 and 25°C this period was reduced to 24 hours of leaf wetness, at 30 o C, we found the need for 36 hours of leaf wetness and at a temperature of 35°C, 48 hours. The optimal temperatures for disease development were 27°C for diameter and affected leaflet area and 28°C for number of lesions per leaflet with 72 hours of leaf wetness. Key words: Cercospora sojina, Glycine max L. ResumoA cultura da soja apresenta grande importância mundialmente, entre as doenças que ocorrem nesta cultura está à mancha olho-de-rã (causada por Cercospora sojina). O objetivo deste trabalho foi avaliar a interação entre temperaturas e diferentes períodos de molhamento foliar na intensidade da mancha olho-de-rã em soja. O experimento foi conduzido em câmara de crescimento com a cultivar Don Mario 7.0i nas temperaturas de 15, 20, 25, 30

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Section: °Csupporting

confidence: 70%

The combined effects of temperature and leaf wetness periods on soybean frogeye leaf spot intensity

Câmera

Ghissi

Reis³

et al. 2016

Sem. Ci. Agr.

Self Cite

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“…Therefore, the slower development of P. pachyrhizi under high temperature conditions may have allowed plants that were carrying the resistance gene derived from PI 594767-A to create an effective resistance response against the pathogen, reflected in the different resistance phenotypes obtained. Indeed, Alves et al (2007) observed lower ASR intensity in 'Conquista' plants inoculated and kept at temperatures around 30 and 15°C. The different phenotypes observed also depend on the dosage of the resistance gene.…”

Section: Discussionmentioning

confidence: 87%

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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“…A doença é favorecida por temperaturas ao redor de 18-26°C e períodos de molhamento foliar superiores a 15 horas (Alves et al, 2007). Inicialmente, o fungo causa lesões pequenas, de cor castanha a marrom escura, próximas às nervuras das folhas (Goellner 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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Intensidade da ferrugem asiática (Phakopsora pachyrhizi H. Sydow & P. Sydow) da soja [Glycine max (L.) Merr.] nas cultivares Conquista, Savana e Suprema sob diferentes temperaturas e períodos de molhamento foliar

Cited by 17 publications

References 13 publications

The combined effects of temperature and leaf wetness periods on soybean frogeye leaf spot intensity

The combined effects of temperature and leaf wetness periods on soybean frogeye leaf spot intensity

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

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

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