Bacterial Endosymbionts: Master Modulators of Fungal Phenotypes

Araldi-Brondolo, Sarah J.; Spraker, Joseph E.; Shaffer, Justin P.; Woytenko, Emma H.; Baltrus, David A.; Gallery, Rachel E.; Arnold, A. Elizabeth

doi:10.1128/9781555819583.ch49

Cited by 11 publications

(10 citation statements)

References 142 publications

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“…We estimate that the genome size of MRE to be c . 0.9 Mb, within the range of typical MRE genome sizes (Araldi‐Brondolo et al ., ; Naito et al ., ). In line with Desirò et al .…”

Section: Discussionmentioning

confidence: 98%

Phylogenomics of Endogonaceae and evolution of mycorrhizas within Mucoromycota

Chang

Desirò

et al. 2019

New Phytologist

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Endogonales (Mucoromycotina), composed of Endogonaceae and Densosporaceae, is the only known non-Dikarya order with ectomycorrhizal members. They also form mycorrhizallike association with some nonspermatophyte plants. It has been recently proposed that Endogonales were among the earliest mycorrhizal partners with land plants. It remains unknown whether Endogonales possess genomes with mycorrhizal-lifestyle signatures and whether Endogonales originated around the same time as land plants did.We sampled sporocarp tissue from four Endogonaceae collections and performed shotgun genome sequencing. After binning the metagenome data, we assembled and annotated the Endogonaceae genomes. We performed comparative analysis on plant-cell-wall-degrading enzymes (PCWDEs) and small secreted proteins (SSPs). We inferred phylogenetic placement of Endogonaceae and estimated the ages of Endogonaceae and Endogonales with expanded taxon sampling.Endogonaceae have large genomes with high repeat content, low diversity of PCWDEs, but without elevated SSP/secretome ratios. Dating analysis estimated that Endogonaceae originated in the Permian-Triassic boundary and Endogonales originated in the mid-late Silurian. Mycoplasma-related endobacterium sequences were identified in three Endogonaceae genomes.Endogonaceae genomes possess typical signatures of mycorrhizal lifestyle. The early origin of Endogonales suggests that the mycorrhizal association between Endogonales and plants might have played an important role during the colonization of land by plants.

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“…We estimate that the genome size of MRE to be c . 0.9 Mb, within the range of typical MRE genome sizes (Araldi‐Brondolo et al ., ; Naito et al ., ). In line with Desirò et al .…”

Section: Discussionmentioning

confidence: 98%

Phylogenomics of Endogonaceae and evolution of mycorrhizas within Mucoromycota

Chang

Desirò

et al. 2019

New Phytologist

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“…There is a growing body of research on bacterial endosymbionts in fungi, and it is proposed that the symbiosis is a major factor in fungal ecology and evolution (Araldi-Brondolo et al, 2017). These endosymbionts are mainly known from plant-associated fungi, but also appear to be frequent in Mucoromycota (Araldi-Brondolo et al, 2017). However, at this time, there are no reports of endosymbionts in predacious fungi.…”

Section: Discussionmentioning

confidence: 99%

Genome-scale phylogenetics reveals a monophyletic Zoopagales (Zoopagomycota, Fungi)

Davis

Amses

Benny

et al. 2019

Molecular Phylogenetics and Evolution

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Previous genome-scale phylogenetic analyses of Fungi have under sampled taxa from Zoopagales; this order contains many predacious or parasitic genera, and most have never been grown in pure culture. We sequenced the genomes of 4 zoopagalean taxa that are predators of amoebae, nematodes, or rotifers and the genome of one taxon that is a parasite of amoebae using single cell sequencing methods with whole genome amplification. Each genome was a metagenome, which was assembled and binned using multiple techniques to identify the target genomes. We inferred phylogenies with both super matrix and coalescent approaches using 192 conserved proteins mined from the target genomes and performed ancestral state reconstructions to determine the ancestral trophic lifestyle of the clade. Our results indicate that Zoopagales is monophyletic. Ancestral state reconstructions provide moderate support for mycoparasitism being the ancestral state of the clade.

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“…Second, a growing body of literature suggests that EHB in plant-associated Ascomycota generally are facultative symbionts with ecologically flexible life modes (Araldi-Brondolo et al 2017). Here, we extend that perspective by showing that, in some cases, the presence or absence of EHB in a fungal isolate can influence how that fungus interacts with seeds.…”

Section: Discussionmentioning

confidence: 99%

“…Functional roles of EHB are best known in the context of associations with diverse Mucoromycota and Basidiomycota that interact with roots and other tissues of plants after germination (reviewed by Araldi-Brondolo et al 2017). These EHB can influence virulence of fungi, the establishment and function of mutualistic associations, and other fungal traits (Partida-Martínez and Hertweck 2005, Lumini et al 2007, Salvioli et al 2010.…”

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confidence: 99%

“…The majority of seed-associated fungi are members of the Ascomycota, the most speciesrich phylum of fungi (Spatafora et al 2006, Schoch et al 2009, U'Ren et al 2009). Screening of diverse filamentous Ascomycota (Pezizomycotina) indicates that EHB are common among Pezizomycetes, Eurotiomycetes, Dothideomycetes, and Sordariomycetes that associate with plants (e.g., Hoffman and Arnold 2010, Hoffman et al 2013, Arendt et al 2016, Araldi-Brondolo et al 2017. They often form facultative associations, and many EHB can be removed by antibiotic treatments (Hoffman et al 2013, Arendt et al 2016.…”

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confidence: 99%

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Context-dependent and variable effects of endohyphal bacteria on interactions between fungi and seeds

et al. 2018

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Context-dependent and variable effects of endohyphal bacteria on interactions between fungi and seeds, AbstractPlant-associated fungi often harbor endohyphal bacteria (EHB) that modulate fungal phenotypes.We quantified the effects of EHB on interactions between fungi and seeds of neotropical pioneer trees, which fungi colonize naturally in forest soil. Seeds were exposed to six fungal isolates that harbored EHB, and to clones of those fungi from which EHB were removed by antibiotic treatment. Seed colonization by fungi was evaluated for five tree species, and germination and viability were evaluated for three tree species. EHB influenced seed colonization by fungi in 5 of 30 fungus-tree species combinations, but the magnitude of their effects was small and the direction of effects depended upon fungal isolate-tree species pairs. EHB had rare and contextdependent effects on seed germination and viability, but their effects were strong when observed.Rare but powerful effects of EHB on fungal interactions with seeds highlight important and context-dependent aspects of plant and fungal ecology.

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Bacterial Endosymbionts: Master Modulators of Fungal Phenotypes

Cited by 11 publications

References 142 publications

Phylogenomics of Endogonaceae and evolution of mycorrhizas within Mucoromycota

Phylogenomics of Endogonaceae and evolution of mycorrhizas within Mucoromycota

Genome-scale phylogenetics reveals a monophyletic Zoopagales (Zoopagomycota, Fungi)

Context-dependent and variable effects of endohyphal bacteria on interactions between fungi and seeds

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