The Arbuscular Mycorrhizal Fungus Funneliformis mosseae Alters Bacterial Communities in Subtropical Forest Soils during Litter Decomposition

Gui, Heng; Purahong, Witoon; Hyde, Kevin D.; Xu, Jianchu; Mortimer, Peter E.

doi:10.3389/fmicb.2017.01120

Cited by 47 publications

(30 citation statements)

References 67 publications

(94 reference statements)

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“…3). These results were consistent with previous findings (Gui et al 2017;Xu et al 2020). Microbial taxa defined at high taxonomic ranks, such as the phylum, can display ecological coherence of microbial groups due to their responses to environmental changes are predictable (Philippot et al 2010;Guo et al 2018).…”

Section: Effect Of Litter Type and Species On The Relative Abundancessupporting

confidence: 93%

Leaf and Root Litter Species Identity Influences Bacterial Community Composition in Short-Term Litter Decomposition

et al. 2020

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Background: Microorganisms play a crucial role in litter decomposition in terrestrial ecosystems. However, it remains unclear, which effects of leaf litter and root species on bacterial community composition and diversity after one year's decomposition. Methods: The leaf and fine roots litters of Robinia pseudoacacia , Quercus acutissima , Pinus tabulaeformis and Pinus densiflora , which are the dominant afforestation species in Mount Tai, were analysed using the Nylon litterbag method and Illumina Miseq high-throughput sequencing for the amplification of bacterial 16S rRNA V4-V5. We measured the remaining litter mass and the bacterial community composition and assessed the effects of leaf and root litter species on the bacterial community after one-year decomposition periods.Results: (1) The remaining masses of leaf and fine roots litters of the four plant species were significantly influenced by organ type and species. The remaining mass of fine root litter was smaller than that of leaf litter for broad-leaved species, and the opposite result was found for coniferous species. (2) The observed species Chao1 and phylogenetic diversity values were significantly lower for leaf litters than for fine root litter. The community richness index was positively correlated with the C content, C:N and lignin content and negatively correlated with N:P, N content and P content. The bacterial community structure differed significantly among leaf and root litter decomposition for the four species ( p <0.05). The bacterial community structure in leaf litter was most highly correlated with the initial N content and N:P. The bacterial community structure in fine roots was most highly correlated with the lignin content. (3) The bacterial phyla Bacteroidetes , Acidobacteria and Gemmatimonadetes were significantly affected by litter and species type, and the relative abundances of Firmicutes and Chloroflexi were only affected by litter type. The relative abundances of Acidobacteria , Firmicutes and Chloroflexi in fine root litter were higher than those in leaf litter, while the opposite result was found for Bacteroidetes . The bacterial genera Burkholderia-Paraburkholderia , Sphingomonas and Mucilaginibacter were affected by litter type ( p <0.05). The relative abundance of Burkholderia-Paraburkholderia in fine root litter was higher than that in leaf litter, while the opposite result was found for Bradyrhizobium , Sphingomonas and Mucilaginibacter . Pearson correlation analysis showed that the average relative abundance of the dominant phyla and genera was affected by the initial litter properties, especially for Bacteroides , Acidobacteria , Burkholderia , and Sphingomonas . Conclusions: Litter type, interaction between litter type and species were important than species in shaping the bacterial diversity and community composition in decomposing litter. And this were affected by initial chemical properties of the litter.

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Section: Effect Of Litter Type and Species On The Relative Abundancessupporting

confidence: 93%

Leaf and Root Litter Species Identity Influences Bacterial Community Composition in Short-Term Litter Decomposition

et al. 2020

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“…Cultured representatives for two other highly auxotrophic 14 Xiphinematobacter. The former are algal parasites that encode a range of GHs [101] but lack endoglucanases, and the latter are endobionts of nematodes, and are commonly observed in forest litter, cellulose-degrading consortia or in associated with Basidiomycota [102][103][104][105].…”

Section: Mutualists Opportunists and Parasitesmentioning

confidence: 99%

Competitive exclusion and metabolic dependency among microorganisms structure the cellulose economy of agricultural soil

Wilhelm¹,

Pepe-Ranney

Weisenhorn

et al. 2020

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Many cellulolytic microorganisms degrade cellulose through extracellular processes that yield free intermediates which promote interactions with non-cellulolytic organisms. We hypothesize that these interactions determine the ecological and physiological traits that govern the fate of cellulosic carbon (C) in soil. We evaluated the genomic potential of soil microorganisms that access C from 13 C-labeled cellulose. We used metagenomic-SIP and metaproteomics to evaluate whether cellulolytic and non-cellulolytic microbes that access 13 C from cellulose encode traits indicative of metabolic dependency or competitive exclusion. The most highly 13 C-enriched taxa were cellulolytic Cellvibrio ( Gammaproteobacteria ) and Chaetomium ( Ascomycota ), which exhibited a strategy of self-sufficiency (prototrophy), rapid growth, and competitive exclusion via antibiotic production. These ruderal taxa were common indicators of soil disturbance in agroecosystems, such as tillage and fertilization. Auxotrophy was more prevalent in cellulolytic Actinobacteria than in cellulolytic Proteobacteria , demonstrating differences in dependency among cellulose degraders. Non-cellulolytic taxa that accessed 13 C from cellulose ( Planctomycetales , Verrucomicrobia and Vampirovibrionales ) were highly dependent, as indicated by patterns of auxotrophy and 13 C-labeling (i.e. partial labelling or labeling at later-stages). Major 13 C-labeled cellulolytic microbes ( e.g. Sorangium, Actinomycetales, Rhizobiales and Caulobacteraceae ) possessed adaptations for surface colonization ( e.g. gliding motility, hyphae, attachment structures) signifying the importance of surface ecology in decomposition. These results suggest that access to cellulose was accompanied by ecological trade-offs characterized by differing degrees of metabolic dependency and competitive exclusion. These trade-offs likely influence microbial growth dynamics on particulate organic carbon and reveal that the fate of carbon is governed by a complex economy within the microbial community.

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“…The cultured representatives for two other highly auxotrophic 13 C-enriched noncellulolytic phylobins are obligate symbionts, namely Vampirovibrio and Candidatus Xiphinematobacter. The former are algal parasites that encode a range of GHs [60] but lack endoglucanases, and the latter are endobionts of nematodes, and are commonly observed in forest litter, cellulose-degrading consortia or in associated with Basidiomycota [61][62][63][64]. Xiphinematobacter and Planctomyces have both been previously identi ed in SIP cellulose experiments in agricultural soil, with the former identi ed as a latestage and putatively mutualistic cellulosic-C consumer [10,15].…”

Section: Mutualists Opportunists and Parasitesmentioning

confidence: 99%

Competitive exclusion and metabolic dependency among microorganisms structure the cellulose economy of agricultural soil

Wilhelm

Pepe-Ranney

Weisenhorn

et al. 2020

Preprint

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Background Microorganisms that degrade cellulose utilize extracellular processes that yield free intermediates which promote interactions with non-cellulolytic organisms. We hypothesized that these interactions determine the ecological and physiological traits governing the fate of cellulosic carbon (C) in soil. We used data from a metagenomic-SIP experiment to perform comparative genomics and characterize the attributes of cellulolytic and non-cellulolytic taxa accessing 13C from cellulose. We hypothesized that cellulolytic taxa would exhibit competitive traits to limit access, while non-cellulolytic taxa would display metabolic dependency, such as signatures of adaptive gene loss. We tested our hypotheses by evaluating genomic traits indicative of competitive exclusion or metabolic dependency, such as antibiotic production, growth rate, surface attachment, biomass degrading potential and auxotrophy.Results The most 13C-enriched taxa were cellulolytic Cellvibrio (Gammaproteobacteria) and Chaetomium (Ascomycota), which exhibited a strategy of self-sufficiency (prototrophy), rapid growth, and competitive exclusion via antibiotic production. Auxotrophy was more prevalent in cellulolytic Actinobacteria than in cellulolytic Proteobacteria, demonstrating differences in dependency among cellulose degraders. Non-cellulolytic taxa that accessed 13C from cellulose (Planctomycetales, Verrucomicrobia and Vampirovibrionales) were highly dependent, as indicated by patterns of auxotrophy and 13C-labeling (i.e. partial labelling or labeling at later-stages). Major 13C-labeled cellulolytic microbes (e.g. Sorangium, Actinomycetales, Rhizobiales and Caulobacteraceae) possessed adaptations for surface colonization (e.g. gliding motility, hyphae, attachment structures) signifying the importance of surface ecology in decomposition. Conclusions Our results demonstrate that access to cellulose was accompanied by ecological trade-offs characterized by differing degrees of metabolic dependency and competitive exclusion. These trade-offs influence microbial growth dynamics on particulate organic carbon and reveal that the fate of carbon is governed by a complex economy within the microbial community. We propose three ecological groups to describe participants in this economy: (i) independent primary degraders, (ii) integrated primary degraders and (iii) mutualists, opportunists and parasites. The relative importance and taxonomic composition of these groups reported here should be considered context dependent, likely reflecting disturbance and management practices common to agricultural soils.

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The Arbuscular Mycorrhizal Fungus Funneliformis mosseae Alters Bacterial Communities in Subtropical Forest Soils during Litter Decomposition

Cited by 47 publications

References 67 publications

Leaf and Root Litter Species Identity Influences Bacterial Community Composition in Short-Term Litter Decomposition

Leaf and Root Litter Species Identity Influences Bacterial Community Composition in Short-Term Litter Decomposition

Competitive exclusion and metabolic dependency among microorganisms structure the cellulose economy of agricultural soil

Competitive exclusion and metabolic dependency among microorganisms structure the cellulose economy of agricultural soil

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