Survey of fungi associated with cassava root rot from different producing regions in Brazil

Authors

  • Sandielle Araújo Vilas Boas Federal University of Bahia Reconcavo; Center of Agricultural, Environmental and Biological Sciences
  • Saulo Alves Santos de Oliveira Embrapa Cassava & Fruits
  • Carlos Augusto Dórea Bragança Federal University of Bahia Reconcavo; Center of Agricultural, Environmental and Biological Sciences
  • Juliana Barros Ramos Federal University of Bahia Reconcavo; Center of Agricultural, Environmental and Biological Sciences
  • Eder Jorge de Oliveira Embrapa Cassava & Fruits

DOI:

https://doi.org/10.1590/0103-9016-2015-0366

Keywords:

Manihot esculenta, ITS barcode, phylogeny, soil-borne diseases

Abstract

Although root rot is one of the major diseases affecting Brazilian cassava (Manihot esculenta Crantz.), little is known about the diversity of root rot pathogens. In this study, diseased plants exhibiting root rot symptoms were collected from cassava-producing regions in five Brazilian states: Bahia, Sergipe, Paraíba, Maranhão, Tocantins, and Paraná. Seventy isolates were obtained and assigned to species complexes based on rDNA's ITS (internal transcribed spacer of the ribosomal DNA) region (ITS1, ITS2 and 5.8S). A total of seven species complexes was found belonging to the genus Fusarium (56/74), followed by Lasiodiplodia (8/74), Neoscytalidium (6/74), and Diaporthe/Phomopsis complex (2/74), Phytophthora, and Corallomycetella (1/74 each). These species were distributed differently according to sample locations and states, but overall, the F. solani species complex (FSSC) was the most prevalent. A number of phylogenetic lineages had not been previously reported as being associated with cassava-root rot disease, such as: F. graminearum (FGSC), F. incarnatum-equiseti (FIESC) and F. chlamydosporum (FCSC) complexes, and a phylogenetic lineage most closely related to P. phaseolorum. Results suggest the need to improve knowledge of the species associated with cassava, including multilocus phylogeny for a more specific characterization, and differences in the resistance background associated with these species, as a strategy to incorporate resistance to multiple pathogens in cassava breeding programs.

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Published

2017-02-01

How to Cite

Boas, S. A. V., Oliveira, S. A. S. de, Bragança, C. A. D., Ramos, J. B., & Oliveira, E. J. de. (2017). Survey of fungi associated with cassava root rot from different producing regions in Brazil. Scientia Agricola, 74(1), 60-67. https://doi.org/10.1590/0103-9016-2015-0366

Issue

Section

Plant Pathology