Population genetic structure in a social landscape: barley in a traditional Ethiopian agricultural system

Evolutionary Applications

Leah H. Samberg²  Lila Fishman¹ 

[1] University of Montana, Missoula, MT, USA;University of California, Santa Cruz, CA, USA

关键词: agriculture;    conservation genetics;    crop genetic resources;    ethiopia;    farmer seed systems;    landraces;   

DOI  :  10.1111/eva.12091

来源: Wiley

【 摘 要 】

Abstract

Conservation strategies are increasingly driven by our understanding of the processes and patterns of gene flow across complex landscapes. The expansion of population genetic approaches into traditional agricultural systems requires understanding how social factors contribute to that landscape, and thus to gene flow. This study incorporates extensive farmer interviews and population genetic analysis of barley landraces (Hordeum vulgare) to build a holistic picture of farmer-mediated geneflow in an ancient, traditional agricultural system in the highlands of Ethiopia. We analyze barley samples at 14 microsatellite loci across sites at varying elevations and locations across a contiguous mountain range, and across farmer-identified barley types and management strategies. Genetic structure is analyzed using population-based and individual-based methods, including measures of population differentiation and genetic distance, multivariate Principal Coordinate Analysis, and Bayesian assignment tests. Phenotypic analysis links genetic patterns to traits identified by farmers. We find that differential farmer management strategies lead to markedly different patterns of population structure across elevation classes and barley types. The extent to which farmer seed management appears as a stronger determinant of spatial structure than the physical landscape highlights the need for incorporation of social, landscape, and genetic data for the design of conservation strategies in human-influenced landscapes.

【 授权许可】

CC BY   
© 2013 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd

Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.