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Open Access Short Report

The development and characterisation of a bacterial artificial chromosome library for Fragaria vesca

Julio Bonet1, Elena Lopez Girona2, Daniel J Sargent2, Monica C Muñoz-Torres35, Amparo Monfort1, Albert G Abbott3, Pere Arús1, David W Simpson2 and Jahn Davik4*

Author Affiliations

1 IRTA. Centre de Recerca en Agrigenòmica CSIC-IRTA-UAB, 38348 Cabrils, Spain

2 East Malling Research (EMR), New Road, East Malling, Kent ME19 6BJ, UK

3 Clemson University, Department of Genetics and Biochemistry, Clemson, SC 29634 USA

4 Bioforsk Midt-Norge, Kvithamar, N-7500 Stjordal, Norway

5 Current address : Georgetown University, Department of Biology, Washington, DC 20057 USA

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BMC Research Notes 2009, 2:188  doi:10.1186/1756-0500-2-188

Published: 23 September 2009

Abstract

Background

The cultivated strawberry Fragaria ×ananassa is one of the most economically-important soft-fruit species. Few structural genomic resources have been reported for Fragaria and there exists an urgent need for the development of physical mapping resources for the genus. The first stage in the development of a physical map for Fragaria is the construction and characterisation of a high molecular weight bacterial artificial chromosome (BAC) library.

Methods

A BAC library, consisting of 18,432 clones was constructed from Fragaria vesca f. semperflorens accession 'Ali Baba'. BAC DNA from individual library clones was pooled to create a PCR-based screening assay for the library, whereby individual clones could be identified with just 34 PCR reactions. These pools were used to screen the BAC library and anchor individual clones to the diploid Fragaria reference map (FV×FN).

Findings

Clones from the BAC library developed contained an average insert size of 85 kb, representing over seven genome equivalents. The pools and superpools developed were used to identify a set of BAC clones containing 70 molecular markers previously mapped to the diploid Fragaria FV×FN reference map. The number of positive colonies identified for each marker suggests the library represents between 4× and 10× coverage of the diploid Fragaria genome, which is in accordance with the estimate of library coverage based on average insert size.

Conclusion

This BAC library will be used for the construction of a physical map for F. vesca and the superpools will permit physical anchoring of molecular markers using PCR.