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Spatio-temporal dynamics of genetic diversity in Sorghum bicolor in Niger

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Relation http://oar.icrisat.org/2280/
http://dx.doi.org/10.1007/s00122-009-1257-1
 
Title Spatio-temporal dynamics of genetic diversity in Sorghum bicolor in Niger
 
Creator Deu, M
Sagnard, F
Chantereau, J
Calatayud, C
Vigouroux, Y
Pham, J L
Mariac, C
Kapran, I
Mamadou, A
Gerard, B
Ndjeunga, J
Bezançon, G
 
Subject Sorghum
 
Description The dynamics of crop genetic diversity need to
be assessed to draw up monitoring and conservation priorities. However, few surveys have been conducted in centres of diversity. Sub-Saharan Africa is the centre of
origin of sorghum. Most Sahel countries have been faced
with major human, environmental and social changes in recent decades, which are suspected to cause genetic erosion.Sorghum is the second staple cereal in Niger, a centre of diversity for this crop. Niger was submitted to recurrent drought period and to major social changes during these
last decades. We report here on a spatio-temporal analysis
of sorghum genetic diversity, conducted in 71 villages
covering the rainfall gradient and range of agro-ecological
conditions in Niger’s agricultural areas. We used 28
microsatellite markers and applied spatial and genetic
clustering methods to investigate change in genetic diversity over a 26-year period (1976–2003). Global genetic
differentiation between the two collections was very low
(Fst = 0.0025). Most of the spatial clusters presented no
major differentiation, as measured by Fst, and showed
stability or an increase in allelic richness, except for two of them located in eastern Niger. The genetic clusters identified by Bayesian analysis did not show a major change
between the two collections in the distribution of accessions between them or in their spatial location. These
results suggest that farmers’ management has globally
preserved sorghum genetic diversity in Niger.
 
Publisher Springer Verlag
 
Date 2010
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/2280/1/TAG120_1301-1313_2010.pdf
Deu, M and Sagnard, F and Chantereau, J and Calatayud, C and Vigouroux, Y and Pham, J L and Mariac, C and Kapran, I and Mamadou, A and Gerard, B and Ndjeunga, J and Bezançon, G (2010) Spatio-temporal dynamics of genetic diversity in Sorghum bicolor in Niger. TAG Theoretical and Applied Genetics, 120. pp. 1301-1313.