A reference high-density genetic map of greater yam (Dioscorea alata L.)

Cormier Fabien, Lawac Floriane, Maledon Erick, Gravillon Marie-Claire, Nudol Elie, Mournet Pierre, Vignes Hélène, Chaïr Hâna, Arnau Gemma. 2019. A reference high-density genetic map of greater yam (Dioscorea alata L.). Theoretical and Applied Genetics, 132 (6) : pp. 1733-1744.

Journal article ; Article de revue à facteur d'impact
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Quartile : Outlier, Sujet : AGRONOMY / Quartile : Outlier, Sujet : HORTICULTURE / Quartile : Q1, Sujet : PLANT SCIENCES / Quartile : Q1, Sujet : GENETICS & HEREDITY

Abstract : Greater yam (Dioscorea alata L.) is a major staple food in tropical and subtropical areas. This study aimed to produce the first reference genetic map of this dioecious species using genotyping-by-sequencing. In this high-density map combining information of two F1 outcrossed populations, 20 linkage groups were resolved as expected and 1579 polymorphic markers were ordered. The consensus map length was 2613.5 cM with an average SNP interval of 1.68 cM. An XX/XY sex determination system was identified on LG6 via the study of sex ratio, homology of parental linkage groups and the identification of a major QTL for sex determination. Homology with the sequenced D. rotundata is described, and the median physical distance between SNPs was estimated at 139.1 kb. The effects of segregation distortion and the presence of heteromorphic sex chromosomes are discussed. This D. alata linkage map associated with the available genomic resources will facilitate quantitative trait mapping, marker-assisted selection and evolutionary studies in the important yet scarcely studied yam species.

Mots-clés Agrovoc : Igname, Polymorphisme génétique

Classification Agris : F30 - Plant genetics and breeding

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Agence(s) de financement européenne(s) : European Commission

Auteurs et affiliations

  • Cormier Fabien, CIRAD-BIOS-UMR AGAP (GLP) ORCID: 0000-0002-7283-4616 - auteur correspondant
  • Lawac Floriane, VARTC (VUT)
  • Maledon Erick, CIRAD-BIOS-UMR AGAP (GLP)
  • Gravillon Marie-Claire, CIRAD-BIOS-UMR AGAP (GLP)
  • Mournet Pierre, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-8011-8647
  • Vignes Hélène, CIRAD-BIOS-UMR AGAP (FRA)
  • Arnau Gemma, CIRAD-BIOS-UMR AGAP (GLP)

Source : Cirad-Agritrop (

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