Punctelia borreri and P. subrudecta (Parmeliaceae) associate with a partially overlapping pool of Trebouxia gelatinosa lineages

Garrido-Benavent, Isaac; Mora-Rodríguez, María Reyes; Chiva, Salvador; Fos, Simon; Barreno, Eva

doi:10.1017/s0024282923000269

Cited by 4 publications

(1 citation statement)

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“…Because previous studies have shown that lichen-forming fungi tend to preferentially select photobiont lineages which are better adapted to local environmental conditions [ 18 , 19 , 20 , 21 , 22 , 23 ], we will here test the following hypotheses: (i) mycobionts in the R. farinacea group associate differentially with phycobionts in Macaronesia and Mediterranean, temperate, and Boreal regions in Europe; and (ii) the association with different phycobionts shapes the ecological distribution of the mycobionts. In doing this, we will investigate the complexity of interactions among mycobiont and phycobiont lineages, the degree of specificity across their geographic distributions [ 24 , 25 , 26 ], and the climatic niche width of the primary phycobionts.…”

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confidence: 99%

Myco–Phycobiont Interactions within the “Ramalina farinacea Group”: A Geographical Survey over Europe and Macaronesia

Moya,

Chiva,

Pazos

et al. 2024

JoF

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Ramalina farinacea is a widely distributed epiphytic lichen from the Macaronesian archipelagos to Mediterranean and Boreal Europe. Previous studies have indicated a specific association between R. farinacea and Trebouxia microalgae species. Here, we examined the symbiotic interactions in this lichen and its closest allies (the so-called “R. farinacea group”) across ten biogeographic subregions, spanning diverse macroclimates, analyzing the climatic niche of the primary phycobionts, and discussing the specificity of these associations across the studied area. The most common phycobionts in the “R. farinacea group” were T. jamesii and T. lynnae, which showed a preference for continentality and insularity, respectively. The Canarian endemic R. alisiosae associated exclusively with T. lynnae, while the other Ramalina mycobionts interacted with both microalgae. The two phycobionts exhibited extensive niche overlap in an area encompassing Mediterranean, temperate Europe, and Macaronesian localities. However, T. jamesii occurred in more diverse climate types, whereas T. lynnae preferred warmer and more humid climates, often close to the sea, which could be related to its tolerance to salinity. With the geographical perspective gained in this study, it was possible to show how the association with different phycobionts may shape the ecological adaptation of lichen symbioses.

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Section: Introductionmentioning

confidence: 99%

Myco–Phycobiont Interactions within the “Ramalina farinacea Group”: A Geographical Survey over Europe and Macaronesia

Moya,

Chiva,

Pazos

et al. 2024

JoF

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Eco‐phylogenetic study of Trebouxia in southern Africa reveals interbiome connectivity and potential endemism in a green algal lichen photobiont

Medeiros,

Ibáñez,

Arnold

et al. 2024

American J of Botany

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PremiseSouthern Africa is a biodiversity hotspot rich in endemic plants and lichen‐forming fungi. However, species‐level data about lichen photobionts in this region are minimal. We focused on Trebouxia (Chlorophyta), the most common lichen photobiont, to understand how southern African species fit into the global biodiversity of this genus and are distributed across biomes and mycobiont partners.MethodsWe sequenced Trebouxia nuclear ribosomal ITS and rbcL of 139 lichen thalli from diverse biomes in South Africa and Namibia. Global Trebouxia phylogenies incorporating these new data were inferred with a maximum likelihood approach. Trebouxia biodiversity, biogeography, and mycobiont–photobiont associations were assessed in phylogenetic and ecological network frameworks.ResultsAn estimated 43 putative Trebouxia species were found across the region, including seven potentially endemic species. Only five clades represent formally described species: T. arboricola s.l. (A13), T. cf. cretacea (A01), T. incrustata (A06), T. lynniae (A39), and T. maresiae (A46). Potential endemic species were not significantly associated with the Greater Cape Floristic Region or desert. Trebouxia species occurred frequently across multiple biomes. Annual precipitation, but not precipitation seasonality, was significant in explaining variation in Trebouxia communities. Consistent with other studies of lichen photobionts, the Trebouxia–mycobiont network had an anti‐nested structure.ConclusionsDepending on the metric used, ca. 20–30% of global Trebouxia biodiversity occurs in southern Africa, including many species yet to be described. With a classification scheme for Trebouxia now well established, tree‐based approaches are preferable over “barcode gap” methods for delimiting new species.

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Genome-Wide Comparisons Reveal Extensive Divergence Within the Lichen Photobiont Genus, Trebouxia

Poquita-Du,

Otte,

Calchera

et al. 2024

Genome Biology and Evolution

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The green algal genus Trebouxia is the most frequently encountered photobiont of the lichen symbiosis. The single-celled symbionts have a worldwide distribution, including all continents and climate zones. The vast, largely undescribed, diversity of Trebouxia lineages is currently grouped into four phylogenetic clades (A, C, I, and S), based on a multilocus phylogeny. Genomes are still scarce, however, and it is unclear how the phylogenetic diversity, the broad ecological tolerances, and the ability to form symbioses with many different fungal host species are reflected in genome-wide differences. Here, we generated PacBio-based de novo genomes of six Trebouxia lineages belonging to the Clades A and S, isolated from lichen individuals of the genus Umbilicaria. Sequences belonging to Clade S have been reported in a previous study, but were reassembled and reanalyzed here. Genome sizes ranged between 63.08 and 73.88 Mb. Repeat content accounted for 9% to 16% of the genome sequences. Based on RNA evidence, we predicted 14,109 to 16,701 gene models per genome, of which 5,203 belonged to a core set of gene families shared by all 6 lineages. Between 121 and 454, gene families are specific to each lineage. About 53% of the genes could be functionally annotated. The presence of biosynthetic gene clusters (6 to 17 per genome) suggests that Trebouxia algae are able to synthesize alkaloids, saccharides, terpenes, NRPSs, and T3PKSs. Phylogenomic comparisons of the six strains indicate prevalent gene gain during Trebouxia evolution. Some of the gene families that exhibited significant evolutionary changes (i.e. gene expansion and contraction) are associated with metabolic processes linked to protein phosphorylation, which is known to have a role in photosynthesis regulation, particularly under changing light conditions. Overall, there is substantial genomic divergence within the algal genus Trebouxia, which may contribute to the genus’ large ecological amplitude concerning fungal host diversity and climatic niches.

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Punctelia borreri and P. subrudecta (Parmeliaceae) associate with a partially overlapping pool of Trebouxia gelatinosa lineages

Cited by 4 publications

References 66 publications

Myco–Phycobiont Interactions within the “Ramalina farinacea Group”: A Geographical Survey over Europe and Macaronesia

Myco–Phycobiont Interactions within the “Ramalina farinacea Group”: A Geographical Survey over Europe and Macaronesia

Eco‐phylogenetic study of Trebouxia in southern Africa reveals interbiome connectivity and potential endemism in a green algal lichen photobiont

Genome-Wide Comparisons Reveal Extensive Divergence Within the Lichen Photobiont Genus, Trebouxia

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