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2015 ; 10
(9
): e0137689
Nephropedia Template TP
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English Wikipedia
New Fungus-Insect Symbiosis: Culturing, Molecular, and Histological Methods
Determine Saprophytic Polyporales Mutualists of Ambrosiodmus Ambrosia Beetles
#MMPMID26367271
Li Y
; Simmons DR
; Bateman CC
; Short DP
; Kasson MT
; Rabaglia RJ
; Hulcr J
PLoS One
2015[]; 10
(9
): e0137689
PMID26367271
show ga
Ambrosia symbiosis is an obligate, farming-like mutualism between wood-boring
beetles and fungi. It evolved at least 11 times and includes many notorious
invasive pests. All ambrosia beetles studied to date cultivate ascomycotan fungi:
early colonizers of recently killed trees with poor wood digestion. Beetles in
the widespread genus Ambrosiodmus, however, colonize decayed wood. We
characterized the mycosymbionts of three Ambrosiodmus species using quantitative
culturing, high-throughput metabarcoding, and histology. We determined the fungi
to be within the Polyporales, closely related to Flavodon flavus.
Culture-independent sequencing of Ambrosiodmus minor mycangia revealed a single
operational taxonomic unit identical to the sequences from the cultured Flavodon.
Histological sectioning confirmed that Ambrosiodmus possessed preoral mycangia
containing dimitic hyphae similar to cultured F. cf. flavus. The
Ambrosiodmus-Flavodon symbiosis is unique in several aspects: it is the first
reported association between an ambrosia beetle and a basidiomycotan fungus; the
mycosymbiont grows as hyphae in the mycangia, not as budding pseudo-mycelium; and
the mycosymbiont is a white-rot saprophyte rather than an early colonizer: a
previously undocumented wood borer niche. Few fungi are capable of turning rotten
wood into complete animal nutrition. Several thousand beetle-fungus symbioses
remain unstudied and promise unknown and unexpected mycological diversity and
enzymatic innovations.