Maarja Öpik, Department of Botany, University of Tartu, Estonia
Wednesday 26 March 11:00 Sir Neil Chalmers seminar room, Darwin Centre LG16 (below Attenborough studio)
Arbuscular mycorrhizal fungi (AMF, Phylum Glomeromycota) are soil and root-dwelling, obligate plant root symbiotic organisms present in most terrestrial environments. Their occurrence and diversity have important roles in life, and in diversity and functioning of host plant communities. Therefore, understanding the taxonomic and functional diversity of AMF is the topic of increasing popularity. Their diversity patterns are described to address questions ranging from climate change and land use effects to understanding ecosystem succession and macroecological patterns.
Diversity of AMF is commonly measured using DNA sequences of nuclear ribosomal operon markers; the most frequently used one being the SSU rRNA gene. Total AMF molecular operational taxonomic unit (MOTU) richness of SSU rRNA gene sequences suggests at least twice as high number of species present as is currently known on the basis of morphotaxonomy.
These MOTUs have been organised into a common system of “virtual taxa” (VT) in a public database MaarjAM (http://maarjam.botany.ut.ee). VT are delimited as phylogenetically related clades of sequences of SSU rRNA gene at approximately species level. VT nomenclature provides comparability among data and consistent communication among scientists.Application of the VT nomenclature has allowed description of AMF diversity patterns from global to local scales.
In this talk, I will present evidence of global scale patterns of AMF diversity being related to biomes and climatic zones; and of local scale patterns related to host ecological groups, spatiotemporal processes and root- vs. soil-localising AMF growth strategies. I will conclude with highlighting the questions of urgent need to advance the understanding about this important group of organisms.
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