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Transcript patterns associated with ectomycorrhiza development in Eucalyptus globulus and Pisolithus microcarpus.

Sébastien Duplessis1, Pierre-Emmanuel Courty, Denis Tagu

  • 1Unité Mixte de Recherche INRA/UHP 1136 'Interactions Arbres/Microorganismes', Institut National de la Recherche Agronomique, Centre de Recherches de Nancy, F-54280 Champenoux, France.

The New Phytologist
|February 22, 2005
PubMed
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Gene expression in ectomycorrhizal symbiosis involves coordinated temporal patterns. Early stages show fungal cell wall proteins and plant defense genes, followed by metabolic and signaling genes.

Area of Science:

  • Plant-fungal interactions
  • Molecular biology
  • Ectomycorrhizal symbiosis

Background:

  • Regulated gene expression is crucial for ectomycorrhizal symbiosis.
  • Understanding the coordination between symbiotic development and gene expression in both partners is essential.

Purpose of the Study:

  • To elucidate the coordination between ectomycorrhizal symbiosis development and differential gene expression in Eucalyptus globulus bicostata and Pisolithus microcarpus.
  • To identify temporal patterns of gene expression during symbiosis formation.

Main Methods:

  • Analysis of RNA levels from sequential symbiotic tissue samples using cDNA arrays.
  • Application of hierarchical and nonhierarchical clustering algorithms to identify coordinately expressed gene groups.
  • Investigated gene expression in Eucalyptus globulus bicostata and Pisolithus microcarpus.

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Main Results:

  • Observed five distinct temporal patterns of gene induction/repression during symbiosis.
  • Early-stage differentially expressed fungal genes included cell wall proteins, hydrophobins, and mannoproteins.
  • Early plant tissues showed upregulated defense-related proteins; middle and late stages involved metabolic and signaling genes.

Conclusions:

  • Confirmed and extended previous findings on transcript pattern changes accompanying mycorrhizal development.
  • No ectomycorrhiza-specific genes were detected in this study.
  • Gene expression is tightly regulated and coordinated throughout ectomycorrhizal symbiosis development.