Caracterização de isolados de Rhizoctonia spp., associados à mela do feijão-caupi (Vigna unguiculata), coletados em Roraima

Nechet, K. de L.; Halfeld-Vieira, Bernardo A.

doi:10.1590/s0100-41582006000500011

Cited by 12 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…To our knowledge, the occurrence of R. solani AG‐1 IF in cowpea and soybean has not previously been reported in Brazil. Rather, R. solani AG‐1 IA was reported as the cowpea and soybean web blight pathogen in the Amazon (Nechet and Halfeld‐Vieira, ; Ciampi et al , ). Although we did not have access to the isolates of Nechet and Halfeld‐Vieira () to check their classification, it is plausible that they have been unintentionally misidentified, as the first report of AG‐1 IF in Latin America and the Caribbean occurred a few years later (Godoy‐Lutz et al , ).…”

Section: Discussionmentioning

confidence: 99%

“…Rather, R. solani AG‐1 IA was reported as the cowpea and soybean web blight pathogen in the Amazon (Nechet and Halfeld‐Vieira, ; Ciampi et al , ). Although we did not have access to the isolates of Nechet and Halfeld‐Vieira () to check their classification, it is plausible that they have been unintentionally misidentified, as the first report of AG‐1 IF in Latin America and the Caribbean occurred a few years later (Godoy‐Lutz et al , ). Phylogenetic analyses indicated clear divergence between the AG‐1 IF isolates obtained in our survey and the other groups of R. solani AG‐1 complex, consistent with earlier phylogenetic description (Godoy‐Lutz et al , ; González et al , ).…”

Section: Discussionmentioning

confidence: 99%

“…Within the R. solani species complex, the anastomosis group 1 (AG‐1) is notable for including pathogens that affect a wide range of hosts of global importance. The AG‐1 complex causes the economically important and destructive web blight disease in host plants from the Fabaceae, which includes common bean ( Phaseolus vulgaris ) cultivated in high and low altitude areas in Latin America and the Caribbean (Godoy‐Lutz et al , ), and cowpea ( Vigna unguiculata ) or soybean ( Glycine max ) cultivated in the Amazon agroecosystem (Nechet and Halfeld‐Vieira, ; Ciampi et al , ; David et al , ).…”

Section: Introductionmentioning

confidence: 99%

“…Historic and scientific reports indicated that the emergence of R. solani AG‐1 as a pathogen of pastures of the Urochloa genus in Brazil followed a similar phenomenon to the one observed in Colombia (Chavarro‐Mesa et al , ). It has been suggested that this emergence was a result of the expansion of pastures into adjacent areas or into areas previously cultivated with pathogen‐susceptible hosts such as cowpea, rice, and soybean (Meyer et al , ; Nechet and Halfeld‐Vieira, ; Chavarro‐Mesa et al , ).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

show abstract

“…Na região Amazônica doenças foliares causadas por R. solani são comumente descritas em hospedeiros de importância econômica e como limitantes à produção agrícola (DESLANDES, 1944;ALBUQUERQUE, 1999;GASPAROTTO et al, 2001;GASPAROTTO et al, 2001;POLTRONIERI et al, 1999;TRINDADE et al, 1997;NECHET et al, 2008;NECHET et al, 2009). Alguns desses relatos são de ocorrências inéditas (NECHET; HALFELD-VIEIRA, 2006a; NECHET; HALFELD-VIEIRA, 2007;POLTRONIERI et al, 2008;GONçALVES et al, 2009) e confirmam as condições ambientais propícias da região para o desenvolvimento da queima foliar.…”

Section: Introductionunclassified

Caracterização de isolados de Rhizoctonia associados à queima foliar em Roraima.

Youssef¹,

Souza²,

Nechet

et al. 2012

AGRO@MBIENTE

View full text Add to dashboard Cite

Resumo -O objetivo desse trabalho foi caracterizar isolados do fungo Rhizoctonia associados à queima foliar, obtidos de hospedeiros de importância econômica no estado de Roraima. Os isolados foram obtidos de plantas de feijão-caupi (Vigna unguiculata), soja (Glycine max), seringueira (Hevea brasiliensis), melancia (Citrullus lanatus), alface (Lactuca sativa) e feijão-guandu (Cajanus cajan). Os parâmetros utilizados foram números de núcleos, grupo de anastomose e as características culturais da colônia, taxa de crescimento micelial e a formação de escleródios nos meios de cultura: batata dextrose agar (BDA), BDA+asparagina, BDA+extrato de levedura, Czapek Agar, maltose-peptona-agar, soil extract agar, sacarose-yeast-asparagina e V-8. Todos os 10 isolados estudados foram caracterizados como multinucleados e pertencentes à espécie Rhizoctonia solani. Três isolados de feijão-caupi, um de soja e o isolado de melancia foram identificados como AGI-1A e um isolado de feijão-caupi, um de soja e o isolado de feijão-guandu como AGI-1B. O isolado de seringueira não foi identificado como nenhum dos padrões de anastomose utilizado. Para a maioria dos isolados as maiores taxas de crescimento micelial foram obtidas no meio de cultura Soil Extract Agar. Dois tipos de escleródios, característicos do grupo AGI, foram observados: formação de 2-20 tufos placa -1 coloração variável, 1-2 mm e formação de 38-611 microescleródios placa -1 , de coloração marrom, medindo 100 µm. A produção e o tipo de escleródio variaram com o isolado e o meio de cultura utilizado. Palavras-chave -Rhizoctonia solani. Thanatephorus cucumeris. Grupos de anastomose. Escleródio.Abstract-The aim of this work was to characterize Rhizoctonia isolates associated with foliar blight symptom from hosts with economic importance at Roraima state. The isolates were recovered from cowpea (Vigna unguiculata), soybean (Glycine max), rubber tree (Hevea brasiliensis), watermelon (Citrullus lanatus), lettuce (Lactuca sativa) and pigeonpea (Cajanus cajan). The evaluated characteristics were nuclear number, anastomosis group (AG) and cultural characteristics, radial growth rate and the presence and morphology of sclerotia on the following media: potato dextrose agar (PDA), PDA+asparagine, PDA+yeast extract, Czapek Agar, maltose-peptone-agar, soil extract agar, sucrose-yeast-asparagine and V-8. All the 10 isolates evaluated were multinucleate and identified as Rhizoctonia solani. Three cowpea isolates, one soybean isolate and the watermelon isolate anastomosed with AG1-1A and one cowpea isolates, one soybean isolate and the pigeonpea isolate with AGI-1B. The rubber tree isolate was not identified with no anastomosis groups used in this study. Biggest radial growth rates were observed on the medium Soil Extract for most of the isolates. Two types of sclerotia, AGI typic were differentiated: one type of 2-20 flat sclerotia.Petri dish -1 , variable colors, 1 to 2 mm in diameter and another type of 38-611 microsclerotia. Petri dish -1 , brown color, 100 µm in diameter. The number a...

show abstract

First report of Rhizoctonia solani AG1-IA causing foliar blight in snap-bean in Brazil

et al. 2019

View full text Add to dashboard Cite

Caracterização de isolados de Rhizoctonia spp., associados à mela do feijão-caupi (Vigna unguiculata), coletados em Roraima

Cited by 12 publications

References 7 publications

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

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

Caracterização de isolados de Rhizoctonia associados à queima foliar em Roraima.

First report of Rhizoctonia solani AG1-IA causing foliar blight in snap-bean in Brazil

Contact Info

Product

Resources

About