Occurrence and molecular characterization of cyst nematode species (Globodera spp.) associated with potato crops in Colombia

PLoS One. 2021 Jul 14;16(7):e0241256. doi: 10.1371/journal.pone.0241256. eCollection 2021.

Abstract

Potato cyst nematodes (PCN) from the genus Globodera spp. cause major losses in the potato (Solanum tuberosum) industry worldwide. Despite their importance, at present little is known about the status of this plant pathogen in cultivated potatoes in Colombia. In this study, a total of 589 samples collected from 75 geographic localities in nine potato producing regions of Colombia (Cundinamarca, Boyacá, Antioquia, Nariño, Santander, Norte de Santander, Tolima, Caldas and Cauca) were assayed for the presence of potato cyst nematodes. Fifty-seven percent of samples tested positive for PCN. Based on phylogenetic analysis of the internal transcribed spacer region (ITS1-5.8S-ITS2) of the rRNA gene and D2-D3 expansion segments of the 28S rRNA gene, all populations but one were identified as Globodera pallida. Sequences of G. pallida from Colombia formed a monophyletic group closely related to Peruvian populations, with the lowest average number of nucleotide substitutions per site (Dxy = 0.002) and net nucleotide substitutions per site (Da = 0.001), when compared to G. pallida populations from Europe, South and North America. A single sample formed a well-supported subclade along with G. rostochiensis and G. tabacum from Japan, USA and Argentina. To our knowledge this is the first comprehensive survey of Globodera populations from Colombia that includes genetic data. Our findings on species diversity and phylogenetic relationships of Globodera populations from Colombia may help elucidate the status and distribution of Globodera species, and lead to the development of accurate management strategies for the potato cyst nematodes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Colombia
  • Crops, Agricultural / parasitology*
  • Phylogeny*
  • Plant Diseases
  • Solanum tuberosum / parasitology*
  • Tylenchoidea / physiology*

Grants and funding

This work belongs to the project “Recomendaciones técnicas para el manejo integrado de los problemas fitosanitarios: Globodera pallida, síndrome X, virus PYVV y sus posibles vectores en papa”, with the financial support of the Colombian Ministry of Agriculture (Ministerio de Agricultura y Desarrollo Rural de Colombia).