Genetic structure of farmer-managed varieties in clonally-propagated crops

The relative role of sexual reproduction and mutation in shaping the diversity of clonally propagated crops is largely unknown. We analyzed the genetic diversity of yam—a vegetatively-propagated crop—to gain insight into how these two factors shape its diversity in relation with farmers’ classificat...

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Bibliographic Details
Published in:Genetica 2011-08, Vol.139 (8), p.1055-1064
Main Authors: Scarcelli, N, Tostain, S, Vigouroux, Y, Luong, V, Baco, M. N, Agbangla, C, Daïnou, O, Pham, J. L
Format: Article
Language:English
Subjects:
Agriculture - methods
Animal Genetics and Genomics
Biomedical and Life Sciences
Classification
Cloning, Organism
Crops
Crops, Agricultural - classification
Crops, Agricultural - genetics
Crops, Agricultural - physiology
Dioscorea - classification
Dioscorea - genetics
Dioscorea - physiology
Evolutionary Biology
Farm structure
Farmers
Genetic diversity
Genetic structure
genetic variation
Genotype
Genotypes
Human Genetics
Life Sciences
Microbial Genetics and Genomics
microsatellite repeats
Microsatellite Repeats - genetics
Mutation
Phylogeny
Plant Genetics and Genomics
Reproduction
sexual reproduction
yams
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Summary:The relative role of sexual reproduction and mutation in shaping the diversity of clonally propagated crops is largely unknown. We analyzed the genetic diversity of yam—a vegetatively-propagated crop—to gain insight into how these two factors shape its diversity in relation with farmers’ classifications. Using 15 microsatellite loci, we analyzed 485 samples of 10 different yam varieties. We identified 33 different genotypes organized in lineages supported by high bootstrap values. We computed the probability that these genotypes appeared by sexual reproduction or mutation within and between each lineage. This allowed us to interpret each lineage as a product of sexual reproduction that has evolved by mutation. Moreover, we clearly noted a similarity between the genetic structure and farmers’ classifications. Each variety could thus be interpreted as being the product of sexual reproduction having evolved by mutation. This highly structured diversity of farmer-managed varieties has consequences for the preservation of yam diversity.
ISSN:0016-6707
1573-6857
DOI:10.1007/s10709-011-9607-8