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Dal Forno, M./ Sikaroodi, M./ Lücking, R./ Lawrey, J.D./ Gillevet, P./ Grube, M. 2017: [Abstract:] First insights into the microbiota associated with different thallus morphologies in the Dictyonema clade. - Fritschiana 85: 16-17. [RLL List # 251 / Rec.# 39857]
Abstract: Dictyonema sensu lato is the most speciose lichen clade in Basidiomycota, with 136 currently described species (LÜCKING et al. 2017, DAL FORNO et al. 2017). The known photobiont of all these lichen species belong to Rhizonema, a genus of cyanobacteria so far only found in symbiosis with lichens and liverworts (LÜCKING et al. 2009, Cornejo & SCHEIDEGGER 2015). While most of the diversity of Dictyonema s.l. is found in tropical montane regions, several species may also grow in subtropical and temperate regions. The group also shows a wide range of morphologies: the basal clade Cyphellostereum and the paraphyletic genus Dictyonema are filamentous, while the other three genera, Acantholichen, Corella and Cora, are squamulose to mostly foliose (DAL FORNO et al. 2013). We aimed to investigate whether the inhabiting microbial communities of these lichens were related in any way to these different morphologies, given that they all present different substrates to which the bacteria could interact. We sequenced the 16S rDNA region (covering the variable regions one and two) with multi-tag pyrosequencing (MTPS) for 695 samples from 18 countries representing all major clades within Dictyonema s.l. We found that reads matching the photobiont Rhizonemawere predominant in all samples. However, after excluding these cyanobacterial reads, the most abundant bacteria belonged to the Proteobacteria, Acidobacteria, Actinobacteria, and Chloroflexi phyla. Our preliminary results show that there is a non-random composition pattern among the morphological categories with bacterial communities from filamentous species clustering separately from those of foliose species.
URL: https://static.uni-graz.at/fileadmin/nawi-institute/Botanik/Fritschiana/fritschiana-85/fritschiana-85.pdf
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