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Open Access Research article

Population typing of the causal agent of cassava bacterial blight in the Eastern Plains of Colombia using two types of molecular markers

César A Trujillo1, Nathalia Arias-Rojas2, Lucie Poulin2, César A Medina1, Anibal Tapiero3, Silvia Restrepo1, Ralf Koebnik2 and Adriana J Bernal1*

Author Affiliations

1 Laboratorio de Micología y Fitopatología Uniandes (LAMFU), Universidad de Los Andes, Bogotá, Colombia

2 Institut de Recherche pour le Développement (IRD), UMR Résistance des Plantes aux Bioaggresseurs, Montpellier, France

3 Corporación Colombiana de Investigación Agropecuaria (CORPOICA), La Libertad, Villavicencio, Colombia

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BMC Microbiology 2014, 14:161  doi:10.1186/1471-2180-14-161

Published: 19 June 2014

Abstract

Background

Molecular typing of pathogen populations is an important tool for the development of effective strategies for disease control. Diverse molecular markers have been used to characterize populations of Xanthomonas axonopodis pv. manihotis (Xam), the main bacterial pathogen of cassava. Recently, diversity and population dynamics of Xam in the Colombian Caribbean coast were estimated using AFLPs, where populations were found to be dynamic, diverse and with haplotypes unstable across time. Aiming to examine the current state of pathogen populations located in the Colombian Eastern Plains, we also used AFLP markers and we evaluated the usefulness of Variable Number Tandem Repeats (VNTRs) as new molecular markers for the study of Xam populations.

Results

The population analyses showed that AFLP and VNTR provide a detailed and congruent description of Xam populations from the Colombian Eastern Plains. These two typing strategies clearly separated strains from the Colombian Eastern Plains into distinct populations probably because of geographical distance. Although the majority of analyses were congruent between typing markers, fewer VNTRs were needed to detect a higher number of genetic populations of the pathogen as well as a higher genetic flow among sampled locations than those detected by AFLPs.

Conclusions

This study shows the advantages of VNTRs over AFLPs in the surveillance of pathogen populations and suggests the implementation of VNTRs in studies that involve large numbers of Xam isolates in order to obtain a more detailed overview of the pathogen to improve the strategies for disease control.

Keywords:
Xanthomonas axonopodis pv. manihotis; Population dynamics; Molecular markers; Plant pathology