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The Adaptive Radiation of Lichen-Forming Teloschistaceae Is Associated with Sunscreening Pigments and a Bark-To-Rock Substrate Shift

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The Adaptive Radiation of Lichen-Forming Teloschistaceae Is Associated with Sunscreening Pigments and a Bark-To-Rock Substrate Shift The adaptive radiation of lichen-forming Teloschistaceae is associated with sunscreening pigments and a bark-to-rock substrate shift Ester Gayaa,b,1, Samantha Fernández-Brimec,d, Reinaldo Vargase, Robert F. Lachlanf, Cécile Gueidang,h, Martín Ramírez-Mejíaa, and François Lutzonia aDepartment of Biology, Duke University, Durham, NC 27708-0338; bDepartment of Comparative Plant and Fungal Biology, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3DS, United Kingdom; cDepartment of Plant Biology (Botany Unit), Facultat de Biologia, Universitat de Barcelona, 08028 Barcelona, Spain; dDepartment of Botany, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden; eDepartamento de Biología, Universidad Metropolitana de Ciencias de la Educación, Santiago, 7760197, Chile; fDepartment of Biological and Experimental Psychology, Queen Mary University of London, London, E1 4NS, United Kingdom; gAustralian National Herbarium, Commonwealth Scientific and Industrial Research Organisation, Canberra, ACT 2601, Australia; and hDepartment of Life Sciences, Natural History Museum, London, SW7 5BD, United Kingdom Edited by David M. Hillis, The University of Texas at Austin, TX, and approved July 15, 2015 (received for review April 10, 2015) Adaptive radiations play key roles in the generation of biodiversity A potential example of an evolutionary radiation can be found in and biological novelty, and therefore understanding the factors that a group of lichens [obligate mutualistic ectosymbioses between drive them remains one of the most important challenges of evolu- fungi and either or both green algae and cyanobacteria (photo- tionary biology. Although both intrinsic innovations and extrin- bionts) (16)]: the family Teloschistaceae. Although cosmopolitan, sic ecological opportunities contribute to diversification bursts, few this taxon is especially associated with exposed habitats, being able studies have looked at the synergistic effect of such factors. Here we to colonize some of the most arid regions of the world. Because investigate the Teloschistales (Ascomycota), a group of >1,000 liche- many lichens can use fog and dew as their principal source of water nized species with variation in species richness and phenotypic traits and can be highly tolerant to desiccation, they might be regarded as that hinted at a potential adaptive radiation. We found evidence for a well adapted to arid exposed habitats. However, many groups of dramatic increase in diversification rate for one of four families within lichens are limited in their ability to exploit such habitats, due, in this order—Teloschistaceae—which occurred ∼100 Mya (Late Creta- part, to the high levels of UV-light exposure. Protection against ceous) and was associated with a switch from bark to rock and from excessive irradiation is required (17), especially for the photobiont shady to sun-exposed habitats. This adaptation to sunny habitats is partner (18, 19). likely to have been enabled by a contemporaneous key novel pheno- In the Teloschistaceae, the solution to this problem lies in typic innovation: the production in both vegetative structure (thallus) their characteristic orange and yellow pigmentation, which re- and fruiting body (apothecia) of anthraquinones, secondary metabo- sults from the accumulation of cortical anthraquinones. These lites known to protect against UV light. We found that the two eco- secondary metabolites are produced by the fungal partner, and logical factors (sun exposure and rock substrate) and the phenotypic their crystals alter the spectral composition of the light that goes innovation (anthraquinones in the thallus) were all significant when through the cortex (20) by absorbing visible blue light, UV-B and testing for state-dependent shifts in diversification rates, and together -A radiations (21, 22). Synthesis of anthraquinones and other they seem likely to be responsible for the success of the Teloschista- lichen pigments is stimulated by UV-B radiation (e.g., refs. 23– ceae, one of the largest lichen-forming fungal lineages. Our results 26), and they are thought to reduce UV-B–induced damage to support the idea that adaptive radiations are driven not by a single factor or key innovation, but require a serendipitous combination of Significance both intrinsic biotic and extrinsic abiotic and ecological factors. adaptive radiation | lichens | sunlight protection | substrate switch | The tempo of diversification of life can be accelerated by fortu- Teloschistaceae itous ecological opportunity or by phenotypic innovation. In this study, we document how both factors are likely to have played a role in the origin and success of a major fungal lineage, the he rate at which species proliferate through evolutionary time Teloschistaceae (comprising ∼1% of all fungi). Anthraquinone Tvaries greatly from one evolutionary lineage to another, forming pigments are found in a widespread, but scattered, range of one of the most notable characteristics of macroevolutionary fungi and plants, but are particularly abundant in the lichen- change. Adaptive radiations, in which a period of increased speci- forming Teloschistaceae, where they provide sunlight protection, ation is caused by adaptation to novel environments, are particularly especially needed when growing in arid deserts of the world. We – important in generating biological diversity (1 3). Understanding found that anthraquinones evolved in these lichens, in conjunc- the drivers behind these events is thus an important goal. Two basic tion with an ecological switch to exposed, rocky environments, categories of drivers have been described: extrinsic ecological op- allowing them to colonize swathes of unexploited habitats portunities that are presented to the ancestors of radiations (e.g., worldwide and sparking an acceleration in diversification. refs. 4 and 5) and intrinsic evolutionary adaptations within the an- cestral lineage that result in breakthroughs that spur diversification Author contributions: E.G. and F.L. designed research; E.G., S.F.-B., R.V., R.F.L., M.R.-M., (6–10). At an extreme, the latter may involve only one trait—a “key and F.L. performed research; E.G., R.F.L., and F.L. contributed new reagents/analytic tools; E.G., S.F.-B., R.F.L., and C.G. analyzed data; and E.G., R.F.L., C.G., and F.L. wrote the paper. innovation” (11–13). Although both processes are likely to be in- The authors declare no conflict of interest. volved in any adaptive radiation, there have been few attempts to investigate how they may be entwined (14, 15): innovations may This article is a PNAS Direct Submission. Data deposition: The sequences reported in this paper have been deposited in the immediately generate an ecological opportunity by providing access GenBank database (accession nos. KT291442–KT291669). Sequence alignment and tree to a new ecological niche; conversely, the exploitation of a new file data are available from TreeBASE, treebase.org (Study id no. 18015). opportunity might generate strong directional selection, leading to 1To whom correspondence should be addressed. Email: [email protected]. rapid evolutionary change at the origin of the adaptation, the results This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. of which permeate throughout the entire lineage. 1073/pnas.1507072112/-/DCSupplemental. 11600–11605 | PNAS | September 15, 2015 | vol. 112 | no. 37 www.pnas.org/cgi/doi/10.1073/pnas.1507072112 Downloaded by guest on September 24, 2021 DNA in both the fungus and the alga of lichens (22). Anthra- is, however, unique and hints at some evolutionary success fa- quinones are polyketide aromatic compounds, derived from the voring the production of these metabolites. acetyl polymalonyl pathway and synthesized by multidomain The Teloschistaceae, with ∼650 described species (28) and an polyketide synthases (PKSs), which are encoded by PKS gene estimate of >1,000 extant species (29), shares common ancestry clusters (19). Only one gene involved in anthraquinone synthesis with three much less speciose families within the order Teloschis- in lichens has been characterized so far: the transcript of a tales: Brigantiaeaceae, Letrouitiaceae, and Megalosporaceae [<100 nonreducing fungal type I PKS gene from the cultured myco- described species combined (30)]. Whereas the Teloschistaceae is a biont of Xanthoria elegans (27). There are various closely related mainly rock-dwelling cosmopolitan clade with a diversity of growth anthraquinones in the Teloschistales, and each species may habits ranging from crustose to fruticose, the Brigantiaeaceae and possess several in different proportions. The pattern of variation Letrouitiaceae (with a circumpacific center of diversity), as well among taxa is still poorly understood, appears to have little as the Megalosporaceae (with an Australasian center of diversity), phylogenetic signal, and may depend on environmental as well as are generally epiphytic and crustose and are found mostly in the genetic factors. Because all appear to serve the same function, tropics (30). here we simply consider the presence or absence of anthraqui- In this study, we test the hypothesis that the high species richness nones. The ubiquity of anthraquinones within the Teloschistaceae of the Teloschistaceae is the result of an adaptive radiation, by A B Fig. 1. Time-calibrated phylogeny of the order Teloschistales depicting multistate ancestral character state reconstructions of anthraquinone evolution. (A) Pies represent probabilities of each ancestor
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