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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evidence that the fungus Rhizoctonia solani AG-1 IA adapted to Urochloa in Colombia keeps a broad host range including maize

Full text
Author(s):
Nadia Maria Poloni [1] ; Lina Maria Ramos Molina [2] ; Edisson Chavarro Mesa ; Izabela Lopes Garcia [4] ; Paulo Cezar Ceresini [5]
Total Authors: 5
Affiliation:
[1] Universidade Estadual Paulista - Brasil
[2] UNESP - Brasil
[4] Universidade Estadual Paulista - Brasil
[5] Universidade Estadual Paulista - Brasil
Total Affiliations: 5
Document type: Journal article
Source: Summa Phytopathologica; v. 42, n. 3, p. 228-232, 2016-09-00.
Abstract

Palavras-chave The fungus Rhizoctonia solani anastomosis group AG-1 IA has emerged as an important pathogen associated with foliar blight, collar rot and death of Urochloa (Brachiaria) forage pastures in South America. This study aimed to determine whether the adaptation of R. solani AG-1 IA to Urochloa spp. in Colombia promoted phenotypic differences in aggressiveness to distinct hosts. Our hypothesis was that the pathogen populations adapted to Urochloa spp. are not host-specialized and hence are not genetically isolated, thereby maintaining a broad host range, including the fabaceous plants cowpea and soybeans. We also determined whether two groups of isolates from populations of R. solani AG-1 IA sampled from Urochloa in Colombia have adaptive potential to emerge as maize pathogens. Besides the levels of disease severity in different hosts, we also determined the components of evolvability, such as the coefficient of genotypic variance (IG), the environmental variance (IE) and the heritability (h2). We concluded that: i) The adaptation of R. solani AG-1 IA to Urochloa spp. did not cause any phenotypic differences in aggressiveness to distinct hosts and therefore the pathogen maintains a broad host range. ii) The population of R. solani AG-1 IA from Urochloa hybrid Mulato in Colombia has adaptive potential to emerge as a maize pathogen. (AU)

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: 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