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Deciphering Molecular Host-Pathogen Interactions During Ramularia Collo-Cygni Infection on Barley.

René Lemcke1, Elisabet Sjökvist2,3, Stefano Visentin4,5

  • 1Department of Plant and Environmental Sciences, Copenhagen University, Frederiksberg, Denmark.

Frontiers in Plant Science
|November 8, 2021
PubMed
Summary

Barley

Keywords:
Hordeum vulgarePathogen response pathwaysRamulariaTranscriptome (RNA-seq)fungal pathogenhost defensemetabolite responsestransmission electron microscopy

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Area of Science:

  • Plant Pathology
  • Molecular Biology
  • Agricultural Science

Background:

  • Ramularia leaf spot (RLS) disease, caused by *Ramularia collo-cygni*, is a growing threat to global barley production.
  • Understanding barley's response to RLS is crucial for developing resistant cultivars.

Purpose of the Study:

  • To investigate the morphological, transcriptional, and metabolic responses of barley cultivars with differing RLS tolerance to *R. collo-cygni* infection.
  • To identify molecular markers for improving barley tolerance to RLS.

Main Methods:

  • Comparative analysis of two barley cultivars infected with aggressive and mild *R. collo-cygni* isolates.
  • Morphological, transcriptomic (gene expression), and metabolomic analyses.
  • Weighted gene co-expression network analysis.

Main Results:

  • Fungal biomass did not correlate with barley tolerance to RLS.
  • Both cultivars showed cell wall reinforcement and differential gene expression in early colonization stages.
  • Key defense compounds like *p*-CHDA and serotonin were identified, correlating with transcriptomic and morphological data.

Conclusions:

  • Barley exhibits multifaceted responses to *R. collo-cygni* infection.
  • Identified molecular pathways and compounds can aid in developing genetic and physiological markers for enhanced barley RLS tolerance.