Cophylogenetic patterns in algal symbionts correlate with repeated symbiont switches during diversification and geographic expansion of lichen-forming fungi in the genus Sticta (Ascomycota: Peltigeraceae)

Lindgren, Hanna; Moncada, Bibiana; Lucking, Robert; Magain, Nicolas; Simon, Antoine; Goffinet, Bernard; Sérusiaux, Emmanuël; Nelsen, Matthew P; Mercado-Diaz, Joel P; Widhelm, Todd J; Lumbsch, H Thorsten

doi:10.1016/j.ympev.2020.106860

Article (Scientific journals)

Cophylogenetic patterns in algal symbionts correlate with repeated symbiont switches during diversification and geographic expansion of lichen-forming fungi in the genus Sticta (Ascomycota: Peltigeraceae)

Lindgren, Hanna; Moncada, Bibiana; Lucking, Robert et al.

2020 • In Molecular Phylogenetics and Evolution

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https://hdl.handle.net/2268/247932

DOI
10.1016/j.ympev.2020.106860

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32473336

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Keywords :

Cophylogeny; diversity; selectivity; Sticta; symbiosis; Trebouxiophyceae

Abstract :

[en] Highlights • We explored cophylogenetic patterns of fungal and algal partners in the genus Sticta. • Sticta associates with green algae from five genera in Trebouxiophyceae. • Sticta are selective towards their algal symbionts. • Photosymbiodemes with green algae evolved multiple times in Sticta. Abstract Species in the fungal genus Sticta form symbiotic associations primarily with either green algae or cyanobacteria, but tripartite associations or photosymbiodemes involving both types of photobionts occur in some species. Sticta is known to associate with green algae in the genus Symbiochloris. However, previous studies have shown that algae from other genera, such as Heveochlorella, may also be suitable partners for Sticta. We examined the diversity of green algal partners in the genus Sticta and assessed the patterns of association between the host fungus and its algal symbiont. We used multi-locus sequence data from multiple individuals collected in Australia, Cuba, Madagascar, Mauritius, New Zealand, Reunion and South America to infer phylogenies for fungal and algal partners and performed tests of congruence to assess coevolution between the partners. In addition, event-based methods were implemented to examine which cophylogenetic processes have led to the observed association patterns in Sticta and its green algal symbionts. Our results show that in addition to Symbiochloris, Sticta associates with green algae from the genera Chloroidium, Coccomyxa, Elliptochloris and Heveochlorella, the latter being the most common algal symbiont associated with Sticta in this study. Geography plays a strong role in shaping fungal-algal association patterns in Sticta as mycobionts associate with different algal lineages in different geographic locations. While fungal and algal phylogenies were mostly congruent, event-based methods did not find any evidence for cospeciation between the partners. Instead, the association patterns observed in Sticta and associated algae, were largely explained by other cophylogenetic events such as host-switches, losses of symbiont and failure of the symbiont to diverge with its host. Our results also show that tripartite associations with green algae evolved multiple times in Sticta.

Disciplines :

Phytobiology (plant sciences, forestry, mycology...)

Author, co-author :

Lindgren, Hanna

Moncada, Bibiana

Lucking, Robert

Magain, Nicolas ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution

Simon, Antoine ; Université de Liège - ULiège > InBioS

Goffinet, Bernard

Sérusiaux, Emmanuël ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Département de Biologie, Ecologie et Evolution

Nelsen, Matthew P

Mercado-Diaz, Joel P

Widhelm, Todd J

Lumbsch, H Thorsten

Language :

English

Title :

Publication date :

28 May 2020

Journal title :

Molecular Phylogenetics and Evolution

ISSN :

1055-7903

eISSN :

1095-9513

Publisher :

Elsevier, Atlanta, United States - California

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 02 June 2020

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