On‐farm dynamic management of genetic diversity: the impact of seed diffusions and seed saving practices on a population‐variety of bread wheat

Since the domestication of crop species, humans have derived specific varieties for particular uses and shaped the genetic diversity of these varieties. Here, using an interdisciplinary approach combining ethnobotany and population genetics, we document the within‐variety genetic structure of a popu...

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Bibliographic Details
Published in:Evolutionary applications 2012-12, Vol.5 (8), p.779-795
Main Authors: Thomas, Mathieu, Demeulenaere, Elise, Dawson, Julie C., Khan, Abdul Rehman, Galic, Nathalie, Jouanne‐Pin, Sophie, Remoue, Carine, Bonneuil, Christophe, Goldringer, Isabelle
Format: Article
Language:English
Subjects:
Barley
Biodiversity
Case studies
Cassava
Corn
Crop diversification
Crops
Cultural history
Diffusion
Domestication
Environment and Society
Environmental Sciences
Environmental studies
Ethnobotany
Evolution
Farmers
Gene flow
Genetic diversity
Genetic drift
Genetic structure
Genetics
Humanities and Social Sciences
in situ conservation
interdisciplinary study
Life Sciences
Microsatellites
Mitochondrial DNA
network theory
Original
Parameter estimation
Population genetics
Population structure
Populations and Evolution
seed exchange network
Sorghum
Triticum aestivum
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Summary:Since the domestication of crop species, humans have derived specific varieties for particular uses and shaped the genetic diversity of these varieties. Here, using an interdisciplinary approach combining ethnobotany and population genetics, we document the within‐variety genetic structure of a population‐variety of bread wheat (Triticum aestivum L.) in relation to farmers’ practices to decipher their contribution to crop species evolution. Using 19 microsatellites markers, we conducted two complementary graph theory‐based methods to analyze population structure and gene flow among 19 sub‐populations of a single population‐variety [Rouge de Bordeaux (RDB)]. The ethnobotany approach allowed us to determine the RDB history including diffusion and reproduction events. We found that the complex genetic structure among the RDB sub‐populations is highly consistent with the structure of the seed diffusion and reproduction network drawn based on the ethnobotanical study. This structure highlighted the key role of the farmer‐led seed diffusion through founder effects, selection and genetic drift because of human practices. An important result is that the genetic diversity conserved on farm is complementary to that found in the genebank indicating that both systems are required for a more efficient crop diversity conservation.
ISSN:1752-4571
1752-4563
1752-4571
DOI:10.1111/j.1752-4571.2012.00257.x