Acidobacterial Diversity and Ecology in Soil Systems

Acidobacteria constitute a ubiquitous and highly diverse phylum within soil microbiomes, commonly representing up to 20–50 % of bacterial communities in natural and managed ecosystems. Phylogenetic analyses have delineated at least 26 subdivisions, of which subdivisions 1, 3, 4, 6 and 8 are most frequently detected in soils across temperate, tropical and arctic regions. Members of these subdivisions display a remarkable range of physiological traits, from oligotrophic life strategies in nutrient-poor soils to copiotrophic growth in nutrient-amended environments. Many acidobacteria possess genetic potential for utilisation of complex carbohydrates, organic acids and nitrogenous substrates, contributing to biogeochemical cycling of carbon and nitrogen. Soil pH emerges as a primary driver of acidobacterial community structure, with acidophilic taxa dominating in low-pH soils and neutrophilic groups proliferating as acidity decreases. Rhizosphere-colonising acidobacteria have also been shown to influence plant–microbe interactions through exopolysaccharide production, nutrient mobilisation and potential biocontrol activities. Despite cultivation challenges, advances in metagenomics, single-cell genomics and enrichment cultures are progressively illuminating the ecological roles of this once enigmatic phylum, with implications for soil health, ecosystem resilience and sustainable land management worldwide.

Research from Nature Portfolio

Recent studies have emphasised the dominant influence of soil pH on acidobacterial diversity and community composition in agricultural landscapes. In arable soils subjected to gradients of acidity and organic pollutants, bacterial diversity peaked under neutral conditions, while acidophilic acidobacterial lineages were enriched in more acidic soils, underscoring their adaptive capacity to low-pH environments and signifying pH as a key ecological filter. In wetland soils undergoing conversion to cropland or reforestation, land-use changes modulated the relative abundances of acidobacterial subgroups, with arable soils exhibiting higher acidobacterial richness than pristine wetlands. These shifts were closely linked to alterations in soil carbon, nitrogen and phosphorus pools, indicating that nutrient availability and management practices shape acidobacterial community assembly and may hinder the restoration of original microbial assemblages once disturbed.

Acidobacterial Diversity and Ecology in Soil Systems publication trend

The graph below shows the total number of articles in acidobacterial diversity and ecology in soil systems across all publications each year (not limited to Nature Index journals).

Technical terms

Phylum: A high-rank taxonomic category grouping organisms with shared ancestry and major structural features.

Subdivision: A defined class-level unit within the Acidobacteria phylum reflecting phylogenetic lineage.

16S rRNA gene sequencing: A molecular method for profiling bacterial communities based on ribosomal RNA gene variability.

Rhizosphere: The soil region immediately surrounding plant roots, characterised by root exudates and microbial interactions.

Metagenomics: Analysis of genetic material recovered directly from environmental samples to study microbial diversity and function.

Oligotrophic: Referring to organisms adapted to low-nutrient environments.

Copiotrophic: Referring to organisms that thrive in high-nutrient conditions.

References

1. The Ecology of Acidobacteria: Moving beyond Genes and Genomes. Frontiers in Microbiology (2016).
2. Genomic insights into the Acidobacteria reveal strategies for their success in terrestrial environments. Environmental Microbiology (2018).
3. Recent Understanding of Soil Acidobacteria and Their Ecological Significance: A Critical Review. Frontiers in Microbiology (2020).
4. pH is the primary determinant of the bacterial community structure in agricultural soils impacted by polycyclic aromatic hydrocarbon pollution. Scientific Reports (2017).
5. Land use change effects on diversity of soil bacterial, Acidobacterial and fungal communities in wetlands of the Sanjiang Plain, northeastern China. Scientific Reports (2019).
6. Effects of marine sediment as agricultural substrate on soil microbial diversity: an amplicon sequencing study. Environmental Microbiome (2023).
7. Soil microbial community composition and diversity in the rhizosphere of Alsophila spinulosa growing in different habitats within the Chishui Alsophila National Nature Reserve in Guizhou Province, China. Frontiers in Microbiology (2024).