A microsatellite-based, gene-rich linkage map for the AA genome of Arachis (Fabaceae)

Moretzsohn , M.C. and Leoi , L. and Proite , K. and et al, . (2005) A microsatellite-based, gene-rich linkage map for the AA genome of Arachis (Fabaceae). Theoretical and Applied Genetics, 111 (6). pp. 1060-1071.

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Cultivated peanut (Arachis hypogaea) is an important crop, widely grown in tropical and subtropical regions of the world. It is highly susceptible to several biotic and abiotic stresses to which wild species are resistant. As a first step towards the introgression of these resistance genes into cultivated peanut, a linkage map based on microsatellite markers was constructed, using an F(2) population obtained from a cross between two diploid wild species with AA genome (A. duranensis and A. stenosperma). A total of 271 new microsatellite markers were developed in the present study from SSR-enriched genomic libraries, expressed sequence tags (ESTs), and by "data-mining" sequences available in GenBank. Of these, 66 were polymorphic for cultivated peanut. The 271 new markers plus another 162 published for peanut were screened against both progenitors and 204 of these (47.1%) were polymorphic, with 170 codominant and 34 dominant markers. The 80 codominant markers segregating 1:2:1 (P<0.05) were initially used to establish the linkage groups. Distorted and dominant markers were subsequently included in the map. The resulting linkage map consists of 11 linkage groups covering 1,230.89 cM of total map distance, with an average distance of 7.24 cM between markers. This is the first microsatellite-based map published for Arachis, and the first map based on sequences that are all currently publicly available. Because most markers used were derived from ESTs and genomic libraries made using methylation-sensitive restriction enzymes, about one-third of the mapped markers are genic. Linkage group ordering is being validated in other mapping populations, with the aim of constructing a transferable reference map for Arachis.

Item Type: Article
Additional Information: SNNigam Collection
Uncontrolled Keywords: Microsatellite-based, Gene-rich linkage map, AA genome, Arachis (Fabaceae)
Author Affiliation: Embrapa Recursos Genéticos e Biotecnologia, Brazil
Subjects: Crop Improvement > Genetics/Genomics
Divisions: Groundnut
Depositing User: Mr Arbind Seth
Date Deposited: 09 May 2013 08:18
Last Modified: 09 May 2013 08:18
Official URL: http://dx.doi.org/10.1007/s00122-005-0028-x
URI: http://eprints.icrisat.ac.in/id/eprint/10414

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