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Influence of ethnolinguistic diversity on the sorghum genetic patterns in subsistence farming systems in Eastern Kenya

Labeyrie Vanesse, Deu Monique, Barnaud Adeline, Calatayud Caroline, Buiron Marylène, Wambugu Peterson Weru, Manel Stéphanie, Glaszmann Jean-Christophe, Leclerc Christian. 2014. Influence of ethnolinguistic diversity on the sorghum genetic patterns in subsistence farming systems in Eastern Kenya. PloS One, 9 (2):e92178, 14 p.

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Quartile : Q1, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Abstract : Understanding the effects of actions undertaken by human societies on crop evolution processes is a major challenge for the conservation of genetic resources. This study investigated the mechanisms whereby social boundaries associated with patterns of ethnolinguistic diversity have influenced the on-farm distribution of sorghum diversity. Social boundaries limit the diffusion of planting material, practices and knowledge, thus shaping crop diversity in situ. To assess the effect of social boundaries, this study was conducted in the contact zone between the Chuka, Mbeere and Tharaka ethnolinguistic groups in eastern Kenya. Sorghum varieties were inventoried and samples collected in 130 households. In all, 297 individual plants derived from seeds collected under sixteen variety names were characterized using a set of 18 SSR molecular markers and 15 morphological descriptors. The genetic structure was investigated using both a Bayesian assignment method and distance-based clustering. Principal Coordinates Analysis was used to describe the structure of the morphological diversity of the panicles. The distribution of the varieties and the main genetic clusters across ethnolinguistic groups was described using a non-parametric MANOVA and pairwise Fisher tests. The spatial distribution of landrace names and the overall genetic spatial patterns were significantly correlated with ethnolinguistic partition. However, the genetic structure inferred from molecular makers did not discriminate the short-cycle landraces despite their morphological distinctness. The cases of two improved varieties highlighted possible fates of improved materials. The most recent one was often given the name of local landraces. The second one, that was introduced a dozen years ago, displays traces of admixture with local landraces with differential intensity among ethnic groups. The patterns of congruence or discordance between the nomenclature of farmers' varieties and the structure of both genetic and morphological diversity highlight the effects of the social organization of communities on the diffusion of seed, practices, and variety nomenclature. (Résumé d'auteur)

Mots-clés Agrovoc : Sorghum, Amélioration des plantes, ethnobiology [EN], Génétique des populations, Variation génétique, Conservation des ressources génétiques, Variété, Comportement social, Communication, linguistique, agroécologie, Variété indigène, Groupe éthnique, Modèle mathématique

Mots-clés géographiques Agrovoc : Kenya

Classification Agris : F30 - Plant genetics and breeding
F70 - Plant taxonomy and geography
P01 - Nature conservation and land resources
E50 - Rural sociology

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Labeyrie Vanesse
  • Deu Monique, CIRAD-BIOS-UMR AGAP (FRA)
  • Barnaud Adeline, IRD (FRA)
  • Calatayud Caroline, CIRAD-BIOS-UMR AGAP (FRA)
  • Buiron Marylène
  • Wambugu Peterson Weru, KARI (KEN)
  • Manel Stéphanie, Université Aix-Marseille I (FRA)
  • Glaszmann Jean-Christophe, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-9918-875X
  • Leclerc Christian, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/573079/)

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