Fungal Diseases

Grau, C. R.; Dorrance, Anne E.; Bond, Jason P.; Russin, J. S.

doi:10.2134/agronmonogr16.3ed.c14

Cited by 71 publications

(48 citation statements)

References 393 publications

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“…worldwide. It is primarily a foliar disease, even though seeds, pods, and stems can also be affected (Grau et al 2004; Wise and Newman 2015). In the southern United States, FLS has caused severe problems for many years but has also been reported to affect yield in the northern United States (Phillips 1999;Yang et al 2001).…”

mentioning

confidence: 99%

Quantifying the Effects of Fungicides and Tillage on Cercospora sojina Severity and Yield of Soybean

Mengistu

Kelly

Arelli

et al. 2018

Plant Health Progress

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A field study was conducted in 2014 through 2016 at the University of Tennessee Research and Education Center, Milan, TN, to determine fungicide effects on frogeye leaf spot (FLS) caused by Cercospora sojina and to determine disease severity and yield under no-till and tillage. Each plot was visually rated for FLS severity based on the percent leaf area covered from 0 to 100%. The result showed that tillage did not affect severity of the disease or yield. However, there were significant effects from fungicide, year-to-year effects, and fungicide × year interactions. Among the three years, disease severity in 2016 was greater than in 2014 and 2015. Among the six fungicides, Topsin, Topguard, Quadris TOP SBX, and Priaxor significantly (P ≤ 0.05) reduced maximum disease severity in 2016. All fungicide applications improved yield relative to the untreated check. Topsin and Quadris TOP SBX, however, had consistently the highest percent yield increases. These results suggest that not all fungicides that reduced FLS severity equally protected yield, indicating that yield and environmental conditions need to be considered when making appropriate fungicide recommendations in tilled and no-till systems.

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confidence: 99%

Quantifying the Effects of Fungicides and Tillage on Cercospora sojina Severity and Yield of Soybean

Mengistu

Kelly

Arelli

et al. 2018

Plant Health Progress

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“…En los últimos 50 años, a nivel mundial, esta enfermedad se ha manejado mediante variedades de soja con genes de resistencia mayores o Rps (Grau et al, 2004;Schmitthenner, 1985). Se conocen actualmente 17 genes (11 loci y una serie alélica en dos de ellos) en soja que confieren resistencia a P. sojae (Grau et al, 2004;Lin et al, 2013;Sun et al, 2010;Zhang et al, 2013). Estos genes funcionan de acuerdo al postulado de gen-a-gen propuesto por Flor (1955).…”

Section: Introductionunclassified

“…Los patotipos se determinan utilizando un set de 8 a 14 diferenciales de soja, donde cada línea de soja posee un gen de resistencia o Rps. Hasta el año 2000 se habían descrito 55 razas, pero debido al surgimiento continuo de nuevas combinaciones de genes de virulencia en el patógeno, la asignación de un número a la raza se tornó indescifrable (Grau et al, 2004). Por tal motivo, actualmente se describe el patotipo utilizando directamente la fórmula de virulencia, o sea indicando el gen Rps de la soja a la cual el aislado es capaz de infectar.…”

Section: Introductionunclassified

Primer reporte de Phytophthora sojae y sus patotipos afectando soja en Uruguay

Sans¹,

Rodríguez²,

Silva³

et al. 2017

Agrociencia

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La podredumbre de raíz y base de tallo causada por Phytophthora sojae es una enfermedad que causa mermas importantes en el cultivo de soja en el mundo y en la región. Este es el primer reporte de este patógeno afectando soja en Uruguay. Para 14 aislados de P. sojae obtenidos de plantas sintomáticas se determinaron siete razas/patotipos diferentes utilizando un set de 14 diferenciales usados internacionalmente para tal fin. El 57 % de los aislados pertenecieron a un único patotipo (vir1b, 3a, 3b, 5), los seis aislados restantes pertenecieron cada uno a un patotipo diferente incluyendo algunas razas conocidas como raza 4, 14 y 25. Conocer los patotipos que predominan en el país resulta fundamental para la selección por resistencia dentro de un programa de mejoramiento de soja, y a su vez para determinar su compatibilidad con las variedades comerciales. Palabras clave: genes resistencia, genes avirulencia, Rps, podredumbre de raíz y base de tallo

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“…In the USA, five races of the fungus were classified in 1981 [ 15 ], but a study in 2004 showed that there are likely more than 12 different races of C . sojina found in various states [ 16 ]. Based on reactions that a collection of 93 C .…”

Section: Introductionmentioning

confidence: 99%

Fine Mapping and Characterization of Candidate Genes that Control Resistance to Cercospora sojina K. Hara in Two Soybean Germplasm Accessions

et al. 2015

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Frogeye leaf spot (FLS), caused by the fungus Cercospora sojina K. Hara, may cause a significant yield loss to soybean growers in regions with a warm and humid climate. Two soybean accessions, PI 594891 and PI 594774, were identified to carry a high level of resistance similar to that conditioned by the Rcs3 gene in 'Davis'. Previously, we reported that the resistance to FLS in these two plant introductions (PIs) was controlled by a novel gene (s) on chromosome 13 that is different from Rcs3. To fine-map the novel FLS resistance gene(s) in these two PIs, F2: 3 seeds from the crosses between PI 594891 and PI 594774, and the FLS susceptible genotype 'Blackhawk' were genotyped with SNP markers that were designed based on the SoySNP50k iSelect BeadChip data to identify recombinant events and locate candidate genes. Analysis of lines possessing key recombination events helped narrow down the FLS-resistance genomic region in PI 594891 from 3.3 Mb to a 72.6 kb region with five annotated genes. The resistance gene in PI 594774 was fine-mapped into a 540 kb region that encompasses the 72.6 kb region found in PI 594891. Sequencing five candidate genes in PI 594891 identified three genes that have several mutations in the promoter, intron, 5', and 3' UTR regions. qPCR analysis showed a difference in expression levels of these genes in both lines compared to Blackhawk in the presence of C. sojina. Based on phenotype, genotype and haplotype analysis results, these two soybean accessions might carry different resistance alleles of the same gene or two different gene(s). The identified SNPs were used to develop Kompetitive Allele Specific PCR (KASP) assays to detect the resistance alleles on chromosome 13 from the two PIs for marker-assisted selection.

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Fungal Diseases

Cited by 71 publications

References 393 publications

Quantifying the Effects of Fungicides and Tillage on Cercospora sojina Severity and Yield of Soybean

Quantifying the Effects of Fungicides and Tillage on Cercospora sojina Severity and Yield of Soybean

Primer reporte de Phytophthora sojae y sus patotipos afectando soja en Uruguay

Fine Mapping and Characterization of Candidate Genes that Control Resistance to Cercospora sojina K. Hara in Two Soybean Germplasm Accessions

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