Diversity and pathogenicity of rhizoctonia species from the Brazilian Cerrado

Angel José Vieira Blanco, Marília Oliveira Costa, Roberto do Nascimento Silva, Fabio Suzart de Albuquerque, Arthur Tavares de Oliveira Melo, Fabyano Alvares Cardoso Lopes, Andrei Stecca Steindorff, Elder Tadeu Barbosa, Cirano José Ulhoa, Murillo Lobo Junior

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Abstract

Eighty-one Rhizoctonia-like isolates were identified based on morphology and nuclei-staining methods from natural and agricultural soils of the Cerrado (Brazilian savanna). The nucleotide similarity analysis of ITS1-5.8S-ITS2 regions identified 14 different taxa, with 39.5% of isolates assigned to Waitea circinata (zeae, oryzae, and circinata varieties), while 37.0% belonged to Thanatephorus cucumeris anastomosis groups (AGs) AG1-IB, AG1-ID, AG1-IE, AG4-HGI, and AG4-HGIII. Ceratobasidium spp. AG-A, AG-F, AG-Fa, AG-P, and AG-R comprised 23.5%. Rhizoctonia zeae (19.8%), R. solani AG1-IE (18.6%), and binucleate Rhizoctonia AG-A (8.6%) were the most frequent anamorphic states found. Root rot severity caused by the different taxa varied from low to high on common beans, and tended to be low to average in maize. Twenty-two isolates were pathogenic to both hosts, suggesting difficulties in managing Rhizoctonia root rots with crop rotation. These results suggest that cropping history affects the geographical arrangement of AGs, with a prevalence of AG1 in the tropical zone from central to north Brazil while the AG4 group was most prevalent from central to subtropical south. W. circinata var. zeae was predominant in soils under maize production. To our knowledge, this is the first report on the occurrence of W. circinata var. circinata in Brazil.

Original languageEnglish (US)
Pages (from-to)773-781
Number of pages9
JournalPlant disease
Volume102
Issue number4
DOIs
StatePublished - Apr 2018

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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    Blanco, A. J. V., Costa, M. O., Silva, R. D. N., Suzart de Albuquerque, F., Melo, A. T. D. O., Lopes, F. A. C., Steindorff, A. S., Barbosa, E. T., Ulhoa, C. J., & Junior, M. L. (2018). Diversity and pathogenicity of rhizoctonia species from the Brazilian Cerrado. Plant disease, 102(4), 773-781. https://doi.org/10.1094/PDIS-05-17-0721-RE