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

Author(s)

Chavarro-Mesa, Edisson ^{[1, 2]} ; Ceresini, Paulo ^[1] ; Pereira, Danilo ^[3] ; Vicentini, Samara ^[1] ; Silva, Tatiane ^[1] ; Ramos-Molina, Lina ^[4] ; Negrisoli, Matheus ^[5] ; Schurt, Daniel ^[6] ; Vieira Junior, Jose R. ^[7]

Affiliation

^[1] Sao Paulo State Univ Julio de Mesquita Filho UNES, Grad Program Cropping Syst, Dept Crop Protect Agr Engn & Soils, Ilha Solteira - Brazil

^[2] Univ Tecnol Bolivar, Cartagena De Indias - Colombia

^[3] Swiss Fed Inst Technol, Plant Pathol Grp, Inst Integrat Biol, Zurich - Switzerland

^[4] Sao Paulo State Univ Julio de Mesquita Filho UNES, Grad Program Genet & Plant Breeding, Jaboticabal - Brazil

^[5] Sao Paulo State Univ Julio de Mesquita Filho UNES, Grad Program Crop Protect, Botucatu, SP - Brazil

^[6] Embrapa Roraima, Plant Pathol Grp, Boa Vista, Parana - Brazil

^[7] Embrapa Rondonia, Plant Pathol Grp, Porto Velho - Brazil

• Document type: Journal article
• Source: PLANT PATHOLOGY; v. 69, n. 3 JAN 2020.
• Web of Science Citations: 0

Abstract

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 Para, Rondonia, 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 Paraiba Valley, in Sao 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 Rondonia 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 Sao Paulo, R. oryzae-sativae (Ceratobasidium oryzae-sativae) was the predominant pathogen detected causing the rice sheath spot disease. (AU)

• FAPESP's process: 11/50150-3 - The origin of the emerging populations of the Brachiaria collar rot pathogen (Rhizoctonia solani AG-1 IA) in the Amazon and its potential for adaptation to another Brazilian agroecosystem
• Grantee: Paulo Cezar Ceresini
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants
• FAPESP's process: 11/23050-8 - The origin of the emerging populations of the Brachiaria collar rot pathogen (Rhizoctonia solani AG-1 IA) in the Amazon and its potential for adaptation to another Brazilian agroecosystem
• Grantee: Edisson Chavarro Mesa
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/11944-0 - Population genetic structure of Rhizoctonia oryzae-sativae from rice in the Paraíba Valley, SP, and adaptive potential of the pathogen to Brachiaria.
• Grantee: Danilo Augusto dos Santos Pereira
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 17/03403-0 - Bioprospecting of fluorescent bacteria of the genus Pseudomonas in the biocontrol of the foliar blight of signal grass (Urochloa brizantha)
• Grantee: Samara Nunes Campos Vicentini
• Support Opportunities: Scholarships in Brazil - Master