Contributors.- Foreword.- Preface.- Acknowledgements.- 1. Plant conservation and biodiversity: the place of microorganisms.- 2. Conservation of mycorrhizal fungal communities under elevated atmospheric CO2 and anthropogenic nitrogen deposition.- 3. Symbiotic nitrogen fixation between microorganisms and higher plants of natural ecosystems.- 4. Bacterial associations with plants: beneficial, non N-fixing interactions.- 5. Ectomycorrhizas in plant communities.- 6. Arbuscular mycorrhizas in plant communities.- 7. Orchid conservation and mycorrhizal associations.- 8. Ericoid mycorrhizas in plant communities.- 9. The diversity of plant pathogens and conservation: bacteria and fungi sensu lato.- 10. Ex situ conservation of microbial diversity.- 11. Impact of fungal pathogens in natural forest ecosystems: a focus on Eucalypts.- 12. Microbial contaminants in plant tissue culture propagation.- 13. Phytosanitary considerations in species recovery programs.- Index.