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Geographic differentiation and population genetic structure of Moniliophthora roreri in the principal cocoa production areas in Colombia

Jaimes Yeirme, Gonzalez Carolina, Rojas Jairo, Cornejo Omar E., Mideros Maria F., Restrepo Silvia, Cilas Christian, Furtado Edson L.. 2016. Geographic differentiation and population genetic structure of Moniliophthora roreri in the principal cocoa production areas in Colombia. Plant Disease, 100 (8) : pp. 1548-1558.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : PLANT SCIENCES

Abstract : Moniliophthora roreri , is one of the most devastating cocoa disease in the Western Hemisphere. In Colombia, the disease is particularly severe in the Magdalena Valley, which is considered the possible center of origin for the pathogen species. We analyzed the genetic diversity of isolates from the departments of Santander, Antioquia, Tolima, and Huila in Colombia using 23 simple- sequence repeats (SSR) markers. In total, 117 different multilocus geno- types were found among 120 isolates, each one representing a unique haplotype. High mutation rates in the SSR and gene flow can explain the high levels of diversity. Also, the observed and standardized indexes of association ( I A and ˇ rd ) indicate that the populations of M. roreri are clonal. Furthermore, given the high haplotype diversity and the significant linkage disequilibrium observed, we hypothesize that M. roreri could be a primarily asexual species undergoi ng sporadic recombination or par- tial recombination through parasexuality. A Bayesian clustering analy- sis implemented by STRUCTURE showed that the most probable number of genetic groups in the data was three, confirming the geo- graphical differentiation among isolates. Similar results were obtained by a discriminant analysis of princip al components, a principal coordi- nate analysis, and a neighbor-joining tree from microsatellite loci base on Nei distance. Cacao genotypes and environmental variables did con- tribute to the genetic differentiation of the groups. We discuss how this information could be used to improve the management of FPR at the regional level. (Résumé d'auteur)

Mots-clés Agrovoc : Theobroma cacao, Moniliophthora, Génétique des populations, Distribution des populations, Distribution géographique, Variation génétique, Génotype, Microsatellite, Marqueur génétique, Mutation, Gène, Séquence nucléotidique, Génie génétique

Mots-clés géographiques Agrovoc : Colombie

Mots-clés complémentaires : Moniliophthora roreri, SSR

Classification Agris : H20 - Plant diseases
U30 - Research methods

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Jaimes Yeirme, CORPOICA (COL)
  • Gonzalez Carolina, CORPOICA (COL)
  • Rojas Jairo, CORPOICA (COL)
  • Cornejo Omar E., Washington State University (USA)
  • Mideros Maria F., Universidad de los Andes (COL)
  • Restrepo Silvia, Universidad de los Andes (COL)
  • Cilas Christian, CIRAD-BIOS-UPR Bioagresseurs (FRA)
  • Furtado Edson L., UNESP (BRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/581154/)

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