23
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Numerous Clones Resistant to Phytophthora palmivora in the “Guiana” Genetic Group of Theobroma cacao L

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Cocoa black pod rot, a disease caused by Stramenopiles of the genus Phytophthora, and particularly by the pan-tropical species P. palmivora, causes serious production losses worldwide. In order to reduce the impact of these pests and diseases, preference is given to genetic control using resistant varieties and, to that end, breeders seek sources of resistance in wild cocoa trees. For instance, surveys of spontaneous cocoa trees in French Guiana between 1985 and 1995 led to the collection of abundant plant material forming a particular genetic group (the “Guiana” group). Following numerous one-off studies demonstrating the merits of this group as a source of resistance to Phytophthora, this article presents the results of a comprehensive study assessing the resistance of 186 “Guiana” clones in relation to the Guianan strain (GY 27) of P. palmivora. This study, undertaken in French Guiana, using an efficient methodology (ten series of tests and a statistical test adapted to the ordinal nature of the data) confirmed that the “Guiana” genetic group does indeed constitute an important source of resistance to P. palmivora, though with some variations depending on the demes of origin. Numerous clones (59) proved to be as resistant as the SCAVINA 6 resistance control, whilst nine were statistically more resistant. The “Resistant” and “Moderately Resistant” Guianan clones totalled 108 (58% of the total tested). Some of the clones more resistant than SCAVINA 6 could be incorporated into numerous cocoa breeding programmes, particularly those that also display other notable qualities. The same applies for numerous other clones equivalent to SCAVINA 6, especially the “elite”’ clones GU 134-B, GU 139-A and GU 285-A.

          Related collections

          Author and article information

          Contributors
          Role: Editor
          Journal
          PLoS One
          PLoS ONE
          plos
          plosone
          PLoS ONE
          Public Library of Science (San Francisco, USA )
          1932-6203
          2012
          26 July 2012
          : 7
          : 7
          : e40915
          Affiliations
          [1 ]CIRAD, UPR Bioagresseurs : Analyse et Maîtrise du Risque, Kourou, Guyane, France
          [2 ]CIRAD, UMR Ecofog, Kourou, Guyane, France
          [3 ]CIRAD, UMR BGPI, Montpellier, France
          United States Department of Agriculture, United States of America
          Author notes

          Competing Interests: The authors have declared that no competing interests exist.

          Conceived and designed the experiments: PL MD JMT. Performed the experiments: FD VC. Analyzed the data: VR PL. Wrote the paper: PL JMT.

          Article
          PONE-D-11-08927
          10.1371/journal.pone.0040915
          3406055
          22848411
          5d4330a1-68fb-4646-94ea-0ed826a2343d
          Copyright @ 2012

          This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

          History
          : 16 January 2012
          : 14 June 2012
          Page count
          Pages: 6
          Funding
          This study was part of the FEDER Convergence project (European Regional Development Fund) 2009–2012, the “Dicacao” project (Diversity of wild cocoa trees in French Guiana, ans associated endophytes. Merits and use in disease control). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
          Categories
          Research Article
          Agriculture
          Crops
          Crop Diseases
          Pest Control
          Integrated Control
          Sustainable Agriculture
          Biology
          Genetics
          Plant Genetics
          Crop Genetics
          Genetics of Disease

          Uncategorized
          Uncategorized

          Comments

          Comment on this article