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

Autor: Moretzsohn MC; Embrapa Recursos Genéticos e Biotecnologia, C.P. 02372, CEP 70.770-900 Brasília, DF, Brazil. marciocm@cenargen.embrapa.br, Leoi L, Proite K, Guimarães PM, Leal-Bertioli SC, Gimenes MA, Martins WS, Valls JF, Grattapaglia D, Bertioli DJ
Jazyk: angličtina
Zdroj: TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik [Theor Appl Genet] 2005 Oct; Vol. 111 (6), pp. 1060-71. Date of Electronic Publication: 2005 Oct 11.
DOI: 10.1007/s00122-005-0028-x
Abstrakt: 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.
Databáze: MEDLINE
Externí odkaz: