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Evolution of complex symbiotic relationships in a morphologically derived family of lichen-forming fungi

AuthorsDivakar, P.K.; Crespo, A. ; Wedin, M.; Leavitt, S.D.; Hawksworth, D.L.; Myllys, L.; Mccune, B.; Randlane, T.; Bjerke, J.W.; Ohmura, Y.; Schmitt, I.; Boluda, C.G.; Alors, D.; Roca-Valiente, B.; Del-Prado, R.; Ruibal, C.; Buaruang, K.; Núñez-Zapata, J.; Amo de Paz, G.; Rico, V.J.; Molina, M.C.; Elix, J.A.; Esslinger, T.L.; Tronstad, I.K.K.; Lindgren, H.; Ertz, D.; Gueidan, C.; Saag, L.; Mark, K.; Singh, G.; Dal Grande, F.; Parnmen, S.; Beck, A.; Benatti, M.N.; Blanchon, D.; Candan, M.; Clerc, P.; Goward, T.; Grube, M.; Hodkinson, B.P.; Hur, J.S.; Kantvilas, G.; Kirika, P.M.; Lendemer, J.; Mattsson, J.E.; Messuti, M.I.; Miadlikowska, J.; Nelsen, M.; Ohlson, J.I.; Pérez-Ortega, Sergio; Cubas, P.
Lichenicolous fungi
Ancestral character reconstruction
Issue DateDec-2015
PublisherJohn Wiley & Sons
CitationNew Phytologist 208(4): 1217-1226 (2015)
AbstractWe studied the evolutionary history of the Parmeliaceae (Lecanoromycetes, Ascomycota), one of the largest families of lichen-forming fungi with complex and variable morphologies, also including several lichenicolous fungi. We assembled a six-locus data set including nuclear, mitochondrial and low-copy protein-coding genes from 293 operational taxonomic units (OTUs). The lichenicolous lifestyle originated independently three times in lichenized ancestors within Parmeliaceae, and a new generic name is introduced for one of these fungi. In all cases, the independent origins occurred c. 24 million yr ago. Further, we show that the Paleocene, Eocene and Oligocene were key periods when diversification of major lineages within Parmeliaceae occurred, with subsequent radiations occurring primarily during the Oligocene and Miocene. Our phylogenetic hypothesis supports the independent origin of lichenicolous fungi associated with climatic shifts at the Oligocene-Miocene boundary. Moreover, diversification bursts at different times may be crucial factors driving the diversification of Parmeliaceae. Additionally, our study provides novel insight into evolutionary relationships in this large and diverse family of lichen-forming ascomycetes.
Identifiersdoi: 10.1111/nph.13553
issn: 1469-8137
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