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An expressed sequence tag SSR map of tetraploid alfalfa (Medicago sativa L.)

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Abstract

A genetic map constructed from a population segregating for a trait of interest is required for QTL identification. The goal of this study was to construct a molecular map of tetraploid alfalfa (Medicago sativa.) using simple sequence repeat (SSR) markers derived primarily from expressed sequence tags (ESTs) and bacterial artificial chromosome (BAC) inserts of M. truncatula. This map will be used for the identification of drought tolerance QTL in alfalfa. Two first generation backcross populations were constructed from a cross between a water-use efficient, M. sativa subsp. falcata genotype and a low water-use efficient M. sativa subsp. sativa genotype. The two parents and their F1 were screened with 1680 primer pairs designed to amplify SSRs, and 605 single dose alleles (SDAs) were amplified. In the F1, 351 SDAs from 256 loci were mapped to 41 linkage groups. SDAs not inherited by the F1, but transmitted through the recurrent parents and segregating in the backcross populations, were mapped to 43 linkage groups, and 44 of these loci were incorporated into the composite maps. Homologous linkage groups were joined to form eight composite linkage groups representing the eight chromosomes of M. sativa. The composite maps consist of eight composite linkage groups with 243 SDAs from M. truncatula EST sequences, 38 SDAs from M. truncatula BAC clone sequences, and five SDAs from alfalfa genomic SSRs. The total composite map length is 624 cM, with average marker density per composite linkage group ranging from 1.5 to 4.4 cM, and an overall average density of 2.2 cM. Segregation distortion was 10%, and distorted loci tended to cluster on individual homologues of several linkage groups.

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Acknowledgements

We thank Drs. Malay Saha and Mark Sorrells for critical reading of the manuscript. This research was supported by The Samuel Roberts Noble Foundation, Inc.

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Authors and Affiliations

  1. The Samuel Roberts Noble Foundation, Ardmore, 73402, OK, USA

    M. K. Sledge & G. Jiang

  2. Department of Agronomy and Horticulture, New Mexico State University, Las Cruces, 88003-8003, NM, USA

    I. M. Ray

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  1. M. K. Sledge
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  2. I. M. Ray
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  3. G. Jiang
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Correspondence to M. K. Sledge.

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Communicated by F. J. Muehlbauer

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Sledge, M.K., Ray, I.M. & Jiang, G. An expressed sequence tag SSR map of tetraploid alfalfa (Medicago sativa L.). Theor Appl Genet 111, 980–992 (2005). https://doi.org/10.1007/s00122-005-0038-8

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