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Current Genetics

, 53:323 | Cite as

Characterization of the systems governing sexual and self-recognition in the white rot homobasidiomycete Amylostereum areolatum

  • Magriet A. van der NestEmail author
  • Bernard Slippers
  • Jan Stenlid
  • Pieter M. Wilken
  • Rimvis Vasaitis
  • Michael J. Wingfield
  • Brenda D. Wingfield
Research Article

Abstract

This study considered the systems controlling sexual and self-recognition in Amylostereum areolatum, a homobasidiomycetous symbiont of the Sirex woodwasp. To investigate the structure and organization of these systems in A. areolatum, we identified a portion of a putative homologue (RAB1) of the pheromone receptor genes of Schizophyllum commune and Coprinus cinereus, and a portion of a putative homologue of the S. commune mitochondrial intermediate peptidase (mip) gene. Diagnostic DNA-based assays for mating-type were developed and their application confirmed that the fungus has a heterothallic tetrapolar mating system. Segregation analysis showed that RAB1 is linked to mating-type B, while mip is linked to mating-type A. The results of sexual and vegetative compatibility tests suggest that sexual recognition in A. areolatum is controlled by two multiallelic mat loci, while self-recognition is controlled by at least two multiallelic het loci. Therefore, despite the association of A. areolatum with the woodwasp and the unique mixture of sexual and clonal reproduction of the fungus, both recognition systems of the fungus appear to be similar in structure and function to those of other homobasidiomycetes. This is the first report regarding the genes controlling recognition of a homobasidiomycete involved in an obligate mutualistic relationship with an insect.

Keywords

Pheromone receptor Mitochondrial intermediate peptidase Mating-type Vegetative incompatibility Het loci 

Notes

Acknowledgments

We thank the National Research Foundation (NRF), members of the Tree Pathology Co-operative Programme (TPCP) and the THRIP initiative of the Department of Trade and Industry (DTI), South Africa for financial support. We also acknowledge the colleagues mentioned for supplying fungi used in this study.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Magriet A. van der Nest
    • 1
    Email author
  • Bernard Slippers
    • 1
  • Jan Stenlid
    • 2
  • Pieter M. Wilken
    • 1
  • Rimvis Vasaitis
    • 2
  • Michael J. Wingfield
    • 1
  • Brenda D. Wingfield
    • 1
  1. 1.Department of Genetics, Forestry and Agricultural Biotechnology Institute (FABI)University of PretoriaPretoriaSouth Africa
  2. 2.Department of Forest Mycology and PathologySwedish University of Agricultural SciencesUppsalaSweden

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