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Bacterial community structure and plant growth-promoting traits associated with cluster roots of Gevuina avellana (Proteaceae) in soils with contrasting aluminum availability
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DOI：10.1007/s11104-026-08973-y.png)
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Abstract
En 中文
This study aimed to characterize the rhizosphere bacterial community structure associated with the cluster roots (CR) of the aluminum (Al)-accumulating plant, Gevuina avellana Mol. (Proteaceae) growing in soils with contrasting Al availability and evaluated the plant growth-promoting (PGP) traits of bacterial isolates in vitro. Bulk soil and rhizosphere soil from CR and non-cluster roots (non-CR) of G. avellana were sampled at two natural sites with contrasting soil Al saturation: Oncol Park (75% Al saturation; + Al site) and Rucamanque Park (0.5% Al saturation; − Al site). Bacterial diversity and community structure were assessed through 16S rRNA gene metabarcoding, analyzed using QIIME2, LEfSe and FAPROTAX. Al-tolerant strains were additionally isolated and screened in vitro for PGP traits. Bacterial community structure was primarily shaped by site conditions rather than sample type (CR, non-CR or Bulk). Proteobacteria, Acidobacteriota and Planctomycetota were the dominant phyla in both sites. The + Al site was characterized by adapted taxa including Ktedonobacteraceae and Candidatus Xiphinematobacter but greater abundance of culturable Al-tolerant strains was found at -Al site. Isolates from both sites exhibited multiple PGP traits, including phosphate solubilization, siderophore production, ACC deaminase activity and phytohormone production. Site-specific soil properties were the main drivers of rhizosphere bacterial community structure, whereas CR selectively harbored Al-tolerant bacteria with multiple PGP traits. These findings indicate that G. avellana associates with a functionally specialized microbiota adapted to acidic, Al-rich soils, providing a basis for future studies on plant–microbe interactions and the development of bioinoculants for acid soils.
Keywords:
Gevuina avellana
Acidic soils
Aluminum
Cluster roots
Metabarcoding
Al tolerant bacteria
Plant growth-promoting bacteria
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