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Functional & Integrative Genomics

, Volume 12, Issue 1, pp 131–141 | Cite as

Mutagenesis of barley malting quality QTLs with Ds transposons

  • Surinder Singh
  • Han Qi Tan
  • Jaswinder SinghEmail author
Original Paper

Abstract

Various functional genomic tools are being used to identify and characterize genes in plants. The Activator/Dissociation (Ac/Ds) transposon-based approach offers great potential, especially in barley, due to its limited success of genetic transformation and its large genome size. The bias of the Ac/Ds system towards genic regions and its tendency toward localized transpositions can greatly enhance the discovery and tagging of genes linked to Ds. Barley is a key ingredient in malting and brewing industry; therefore, gene discovery in relation to malting has an industrial perspective. Malting quality in barley is a complex and quantitatively inherited trait. Two major quantitative trait loci (QTLs) affecting malting quality traits have been located on chromosome 4H. In this study, Ds was reactivated from parent transposants (TNP) lines, TNP-29 and TNP-79, where Ds was mapped in the vicinity of important malting QTLs. Reactivation of Ds was carried out both by conventional breeding and in vitro approaches. A threefold increase in reactivation frequency through the in vitro approach enabled the development of a new genomic resource for the dissection of malting QTL and gene discovery in barley. Identification of unique flanking sequences, using high-efficiency thermal asymmetric interlaced PCR and inverse PCR from these populations, has further emphasized the new location of Ds in the barley genome and provided new transposon mutants especially in β-GAL1, β-amylase-like gene and ABC transporter for functional genomic studies.

Keywords

Ac/Ds Transposon reactivation Genomics Transformation Barley Cereals 

Notes

Acknowledgements

This work was supported by the Brewing and Malting Barley Research Institute and the Natural Sciences and Engineering Research Council of Canada Collaborative Research and Development. We also thank Dr. Ravneet Kaur and Dr. Manjit Singh for critically reading this manuscript. The authors also thank Mr. Neil Dylan Lamb-Palmer for his suggestions about bioinformatic analysis.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Plant Science DepartmentMcGill UniversityQuebecCanada

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