Fine scale sampling reveals early differentiation of rhizosphere microbiome from bulk soil in young Brachypodium plant roots

Acharya, Shwetha M.; Yee, Mon Oo; Diamond, Spencer; Andeer, Peter F.; Baig, Nameera F.; Aladesanmi, Omolara T.; Northen, Trent R.; Banfield, Jillian F.; Chakraborty, Romy

doi:10.1038/s43705-023-00265-1

Title: Fine scale sampling reveals early differentiation of rhizosphere microbiome from bulk soil in young Brachypodium plant roots

Journal Article · Tue Jun 06 00:00:00 EDT 2023 · ISME Communications

DOI:https://doi.org/10.1038/s43705-023-00265-1· OSTI ID:1983999

Acharya, Shwetha M.; Yee, Mon Oo;

; Andeer, Peter F.; Baig, Nameera F.; Aladesanmi, Omolara T.;

;

Abstract For a deeper and comprehensive understanding of the composition and function of rhizosphere microbiomes, we need to focus at the scale of individual roots in standardized growth containers. Root exudation patterns are known to vary along distinct parts of the root even in juvenile plants giving rise to spatially distinct microbial niches. To address this, we analyzed the microbial community from two spatially distinct zones of the developing primary root (tip and base) in young Brachypodium distachyon grown in natural soil using standardized fabricated ecosystems known as EcoFABs as well as in more conventional pot and tubes. 16S rRNA based community analysis showed a strong rhizosphere effect resulting in significant enrichment of several OTUs belonging to Actinobacteria, Bacteroidetes, Firmicutes and Proteobacteria. However, microbial community composition did not differ between root tips and root base or across different growth containers. Functional analysis of bulk metagenomics revealed significant differences between root tips and bulk soil. The genes associated with different metabolic pathways and root colonization were enriched in root tips. On the other hand, genes associated with nutrient-limitation and environmental stress were prominent in the bulk soil compared to root tips, implying the absence of easily available, labile carbon and nutrients in bulk soil relative to roots. Such insights into the relationships between developing root and microbial communities are critical for judicious understanding of plant-microbe interactions in early developmental stages of plants.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1983999

Journal Information:: ISME Communications, Journal Name: ISME Communications Vol. 3 Journal Issue: 1; ISSN 2730-6151

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United States

Language:: English

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