Diversity and pathogenicity of anastomosis groups of Rhizoctonia associated with potato stem canker and black scurf diseases in Brazil

Inokuti, Eliane Mayumi; Reis, Ailton; Ceresini, Paulo Cézar; Câmara, Marcos Paz Saraiva; Michereff, Sami Jorge

doi:10.1007/s10658-018-01627-5

Cited by 13 publications

(7 citation statements)

References 22 publications

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“…The analysis of mycelial growth is important for the Rhizoctonia Rhizoctonia AG-Fb grew more slowly compared to R. solani AG-4, which may also explain its lower aggressiveness in soybean since it requires more time for infection and colonization of plant tissues (Pannecoucque & Höfte, 2009). Also, binucleate Rhizoctonia AG-Fb and R. solani AG-4 showed mesophilic behaviour, that is, they are organisms capable of growing at temperatures classified as mild in the range of 10-35°C, as reported in the literature (Inokuti et al, 2019). The optimal temperature for mycelial growth occurred at a temperature of 24-26°C, which also corroborates previous reports (Zhao et al, 2019).…”

Section: Treatment Srsi a Germination (%) Amentioning

confidence: 63%

“…In Brazil, the occurrence of binucleate Rhizoctonia of the AG‐A and AG‐R AG causing disease in potato ( Solanum tuberosum L.) has also been reported (Inokuti et al., 2019); AG‐A, AG‐L, AG‐O, AG‐P in eucalyptus ( Eucalyptus grandis W. Hill ex Maiden.) (Sanfuentes et al., 2007); AG‐A, AG‐F, AF‐Fa, AG‐G, AG‐P and AG‐R in common bean and corn (Blanco & Costa, 2018).…”

Section: Discussionmentioning

confidence: 99%

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Characterization and report of binucleate Rhizoctonia AG‐Fb affecting soybean in Brazil

Cappellaro,

Huzar‐Novakowiski,

Chiomento

et al. 2024

Journal of Phytopathology

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Rhizoctonia root rot is a disease that can affect soybean leading to plant death usually in bare patches. Frequently, Rhizoctonia solani has been reported as the main causal agent of the disease. However, due to the great genetic diversity of the genus Rhizoctonia, there are other species that could also attack soybean plants. Thus, the objective of this study was to determine the pathogenicity and characterize an isolate of binucleate Rhizoctonia obtained from a soybean plant with symptoms of root rot cultivated in soil from southern Brazil. The isolate was identified based on the morphology and phylogenetic analysis of the internal transcribed spacer region (ITS) of the rDNA. Pathogenicity tests were then performed on seeds and roots of soybean and the optimum temperature for mycelial growth was determined. The isolate was identified as binucleate Rhizoctonia AG‐Fb and it was pathogenic to soybean seeds and roots. In the pathogenicity assay in soybean seed, the isolate reduced seed germination by 20% and caused seed rot index of 69.3. In the pathogenicity assay in soybean root, the inoculation of binucleate Rhizoctonia AG‐Fb caused 67.3 root rot severity index, and reduced the emergence speed index by 19%, seedling height by 31%, root dry mass by 25% and root volume by 43% in soybean seedlings. The optimum temperature for the mycelial growth of the isolate was 26°C. To the best of our knowledge, this is the first report of binucleate Rhizoctonia AG‐Fb associated with soybean root rot in Brazil.

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Section: Treatment Srsi a Germination (%) Amentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Characterization and report of binucleate Rhizoctonia AG‐Fb affecting soybean in Brazil

Cappellaro,

Huzar‐Novakowiski,

Chiomento

et al. 2024

Journal of Phytopathology

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“…sampled from the Brazilian Amazon or the Cerrados agroecosystems were reported as plant pathogens, such as the binucleate Rhizoctonia spp. AG-A, AG-F, AG-Fa, AG-G, AG-P, and AG-R (Gaino et al, 2010;Blanco et al, 2018;Inokuti et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

A broad diversity survey of Rhizoctonia species from the Brazilian Amazon reveals the prevalence of R. solani AG‐1 IA on signal grass and the new record of AG‐1 IF on cowpea and soybeans

et al. 2020

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Leaf blight, sheath blight, and web blight are major diseases caused by Rhizoctonia species on both Fabaceae and Poaceae plant hosts in the Brazilian Amazon agroecosystem. To determine the diversity of Rhizoctonia species associated with foliar diseases on fabaceous (cowpea and soybean) and poaceous (rice and signal grass [Urochloa brizantha]) hosts, a broad survey was conducted in Pará, Rondônia, Roraima, and Mato Grosso, in the Amazon, from 2012 to 2013. We extended our survey to Cerrado areas of Mato Grosso, and the lowlands of Paraíba Valley, in São Paulo, where these Rhizoctonia foliar diseases have not been reported so far. Our findings revealed that these diseases are caused by a diversity of Rhizoctonia solani AG‐1 complex. We detected that R. solani AG‐1 IA (sexual phase Thanatephorus cucumeris) was the predominant pathogen associated with signal grass leaf blight and collar rot diseases in the Amazon, especially in Rondônia and northern Mato Grosso. In addition, a subgroup of R. solani (AG‐1 IF), not previously reported in Brazil, was associated with leaf blight on cowpea and soybean, in Roraima. Another subgroup (AG‐1 ID) was also detected in Roraima. In Mato Grosso Cerrados we did not find any of the major Rhizoctonia foliar pathogens. Instead, R. oryzae (Waitea circinata) was the predominant species associated with a collar rot on U. brizantha. In the lowlands of São Paulo, R. oryzae‐sativae (Ceratobasidium oryzae‐sativae) was the predominant pathogen detected causing the rice sheath spot disease.

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“…However, potato production is affected by Rhizoctonia solani AG-3PT, which is a natural inhabitant of soil (David et al, 2018). AG-3PT is the dominant anastomosis group (AG) most commonly associated with potatoes (Inokuti et al, 2019). Rhizoctonia solani is the causal agent of stem canker and black scurf diseases in Colombian potatoes (Ferrucho et al, 2012), causing necrotic lesions primarily in roots and stems (Aliferis & Jabaji, 2012;David et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Rhizoctonia solani AG-3PT fungus survives in the soil as mycelia in decomposing tissues and sclerotia on infected tubers and soil (Rioux et al, 2011;Tsror, 2010). Sclerotia adhere to the surface of potato tubers causing black scurf, a severe problem for crop production and distribution and for pathogen-free potato seed production and sale (Inokuti et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Diversidad genética de Rhizoctonia solani GA-3PT, causa etiológica del chancro del tallo y la sarna de la papa en Colombia

Chavarro-Mesa

Herrera-Blanco

Beltrán-Acosta

et al. 2021

CTA

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El chancro del tallo y la sarna negra de la papa son enfermedades ocasionadas por el hongo Rhizoctonia solani grupo de anastomosis tres (GA-3PT), el cual afecta raíces, tallos y tubérculos de papa y reduce el rendimiento de los cultivos. El objetivo de la presente investigación fue determinar la diversidad genética de R. solani GA-3PT presente en los departamentos colombianos de Antioquia, Boyacá y Cundinamarca. La restricción enzimática de la región ribosomal (RFLP, por sus siglas en inglés) ITS-5.8S permitió la diferenciación e identificación específica de los grupos de anastomosis GA-3PT y GA2-1 y confirmó que el GA-3PT es el principal agente causal y origen etiológico de la enfermedad en Colombia. Mediante amplificación aleatoria de marcadores microsatélites (RAMs), por sus siglas en inglés), se observaron dos agrupamientos dentro de R. solani GA-3PT; el GA-3PT (A) comparte un índice de similitud del 78 % entre sí, en comparación con el GA-3PT (B) que presenta una similitud del 79 % entre sus aislamientos. Los agrupamientos no están relacionados con su origen geográfico, sino con el grupo de anastomosis al que pertenecen. La diversidad genética de Nei [D] de 0,25 confirma una alta diversidad genética para el GA-3PT mediante análisis RAMs, relacionada con un alto potencial evolutivo al interior del grupo GA-3PT en Colombia. Finalmente, el hongo R. solani GA-3PT que se obtuvo en Cundinamarca tiene potencial adaptativo para emerger como patógeno de la papa criolla (Solanum phureja) en Colombia, posiblemente, debido a la semejanza de los patosistemas.

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Diversity and pathogenicity of anastomosis groups of Rhizoctonia associated with potato stem canker and black scurf diseases in Brazil

Cited by 13 publications

References 22 publications

Characterization and report of binucleate Rhizoctonia AG‐Fb affecting soybean in Brazil

Characterization and report of binucleate Rhizoctonia AG‐Fb affecting soybean in Brazil

A broad diversity survey of Rhizoctonia species from the Brazilian Amazon reveals the prevalence of R. solani AG‐1 IA on signal grass and the new record of AG‐1 IF on cowpea and soybeans

Diversidad genética de Rhizoctonia solani GA-3PT, causa etiológica del chancro del tallo y la sarna de la papa en Colombia

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