Publikationsdatum:
2024-05-09
Beschreibung:
Ambrosia beetles farm specialised fungi in sapwood tunnels and use pocket-like organs called mycangia to carry propagules of the fungal cultivars. Ambrosia fungi selectively grow in mycangia, which is central
to the symbiosis, but the history of coevolution between fungal cultivars and mycangia is poorly understood. The
fungal family Ceratocystidaceae previously included three ambrosial genera (Ambrosiella, Meredithiella, and Phialophoropsis), each farmed by one of three distantly related tribes of ambrosia beetles with unique and relatively
large mycangium types. Studies on the phylogenetic relationships and evolutionary histories of these three genera
were expanded with the previously unstudied ambrosia fungi associated with a fourth mycangium type, that of the
tribe Scolytoplatypodini. Using ITS rDNA barcoding and a concatenated dataset of six loci (28S rDNA, 18S rDNA,
tef1-α, tub, mcm7, and rpl1), a comprehensive phylogeny of the family Ceratocystidaceae was developed, including
Inodoromyces interjectus gen. & sp. nov., a non-ambrosial species that is closely related to the family. Three minor
morphological variants of the pronotal disk mycangium of the Scolytoplatypodini were associated with ambrosia
fungi in three respective clades of Ceratocystidaceae: Wolfgangiella gen. nov., Toshionella gen. nov., and Ambrosiella remansi sp. nov. Closely-related species that are not symbionts of ambrosia beetles are accommodated by
Catunica adiposa gen. & comb. nov. and Solaloca norvegica gen. & comb. nov. The divergent morphology of the
ambrosial genera and their phylogenetic placement among non-ambrosial genera suggest three domestication
events in the Ceratocystidaceae. Estimated divergence dates for the ambrosia fungi and mycangia suggest that
Scolytoplatypodini mycangia may have been the first to acquire Ceratocystidaceae symbionts and other ambrosial
fungal genera emerged shortly after the evolution of new mycangium types. There is no evidence of reversion to a
non-ambrosial lifestyle in the mycangial symbionts.
Schlagwort(e):
Ecology
;
Evolution
;
Behavior and Systematics
;
14 new taxa
;
Microascales
;
Scolytinae
;
symbiosis
;
two new typifications
Repository-Name:
National Museum of Natural History, Netherlands
Materialart:
info:eu-repo/semantics/article
Format:
application/pdf
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