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Transferable EST-SSR markers for the study of polymorphism and genetic diversity in bread wheat

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Abstract

Nearly 900 SSRs (simple sequence repeats) were identified among 15,000 ESTs (expressed sequence tags) belonging to bread wheat ( Triticum aestivum L.). The SSRs were defined by their minimum length, which ranged from 14 to 21 bp. The maximum length ranged from 24 to 87 bp depending upon the length of the repeat unit itself (1–7 bp). The average density of SSRs was one SSR per 9.2 kb of EST sequence screened. The trinucleotide repeats were the most abundant SSRs detected. As a representative sample, 78 primer pairs were designed, which were also used to screen the dbEST entries for Hordeum vulgare and Triticum tauschii (donor of the D-genome of cultivated wheat) using a cut-off E (expectation) value of 0.01. On the basis of in silico analysis, up to 55.12% of the primer pairs exhibited transferability from Triticum to Hordeum, indicating that the sequences flanking the SSRs are not only conserved within a single genus but also between related genera in Poaceae. Primer pairs for the 78 SSRs were synthesized and used successfully for the study of (1) their transferability to 18 related wild species and five cereal species (barley, oat, rye, rice and maize); and (2) polymorphism between the parents of four mapping populations available with us. A subset of 20 EST-SSR primers was also used to assess genetic diversity in a collection of 52 elite exotic wheat genotypes. This was done with a view to compare their utility relative to other molecular markers (gSSRs, AFLPs, and SAMPL) previously used by us for the same purpose with the same set of 52 bread wheat genotypes. Although only a low level of polymorphism was detected, relative to that observed with genomic SSRs, the study suggested that EST-SSRs can be successfully used for a variety of purposes, and may actually prove superior to SSR markers extracted from genomic libraries for diversity estimation and transferability.

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Acknowledgements

This work was carried out in compliance with the current laws governing genetic experiments in India. The financial support received from the Department of Biotechnology, Government of India for carrying out this study, and from the University Grant Commission in the form of an Emeritus Fellowship to PKG is gratefully acknowledged. We also thank Dr. H. S. Dhaliwal for providing the seed material of the alien species, Dr. K. V. Bhatt for providing help in dendrogram preparation, and Dr. N. D. Young for supplying the macro used for the identification of EST-SSRs

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Correspondence to P. K. Gupta.

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Communicated by R. Hagemann

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Gupta, P.K., Rustgi, S., Sharma, S. et al. Transferable EST-SSR markers for the study of polymorphism and genetic diversity in bread wheat. Mol Genet Genomics 270, 315–323 (2003). https://doi.org/10.1007/s00438-003-0921-4

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  • DOI: https://doi.org/10.1007/s00438-003-0921-4

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