Functional & Integrative Genomics

, Volume 8, Issue 3, pp 187–198 | Cite as

Parallel expression profiling of barley–stem rust interactions

  • Ling Zhang
  • Claudia Castell-Miller
  • Stephanie Dahl
  • Brian Steffenson
  • Andris Kleinhofs
Original Paper

Abstract

The dominant barley stem rust resistance gene Rpg1 confers resistance to many but not all pathotypes of the stem rust fungus Puccinia graminis f. sp. tritici (Pgt). Transformation of Rpg1 into susceptible cultivar Golden Promise rendered the transgenic plants resistant to Pgt pathotype MCC but not to Pgt pathotype QCC. Our objective was to identify genes that are induced/repressed during the early stages of pathogen infection to elucidate the molecular mechanisms and role of Rpg1 in defense. A messenger ribonucleic acid expression analysis using the 22K Barley1 GeneChip was conducted in all pair-wise combinations of two isolines (cv. Golden Promise and Rpg1 transgenic line G02-448F-3R) and two Pgt pathotypes (MCC and QCC) across six time points. Analysis showed that a total of 34 probe sets exhibited expression pattern differences between Golden Promise (susceptible) and G02-448F-3R (resistant) infected with Pgt-MCC. A total of 14 probe sets exhibited expression pattern differences between Pgt-MCC (avirulent) and Pgt-QCC (virulent) inoculated onto G02-448F-3R. These differentially expressed genes were activated during the early infection process, before the hypersensitive response or fungal growth inhibition occurred. Our analysis provides a list of candidate signaling components, which can be analyzed for function in Rpg1-mediated disease resistance.

Keywords

Barley Disease-resistance Expression profiling Microarray data Rust resistance Puccinia graminis f. sp. tritici 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Ling Zhang
    • 1
  • Claudia Castell-Miller
    • 2
  • Stephanie Dahl
    • 2
  • Brian Steffenson
    • 2
  • Andris Kleinhofs
    • 1
    • 3
  1. 1.Department of Crop and Soil SciencesWashington State UniversityPullmanUSA
  2. 2.Department of Plant PathologyUniversity of MinnesotaSt. PaulUSA
  3. 3.School of Molecular BiosciencesWashington State UniversityPullmanUSA

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