Environmental selection and evolutionary process jointly shape genomic and functional profiles of mangrove rhizosphere microbiomes

Xiaoli Yu ¹, Qichao Tu ², Jihua Liu ²

⁰State Key Laboratory for Biocontrol, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Environmental Science and Engineering, Environmental Microbiomics Research Center Sun Yat-sen University Guangzhou China.

Mlife +

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May 31, 2024

View abstract on PubMed

Summary

Introduced mangrove species alter rhizosphere microbiomes, impacting methane, nitrogen, and sulfur cycling. Environmental factors like salinity and ammonium drive these microbial functional changes, crucial for reforestation efforts.

Area Of Science

Environmental microbiology
Ecosystem restoration
Biogeochemical cycles

Background

Mangrove reforestation using introduced species is common but its impact on microbial functions is unclear.
Rhizosphere microbiomes drive crucial biogeochemical cycles like methane, nitrogen, and sulfur in mangroves.

Purpose Of The Study

To investigate how introduced mangrove species affect microbial biogeochemical cycling.
To understand the roles of environmental selection and evolution in shaping these microbial communities.

Main Methods

Metagenome sequencing of rhizosphere microbiomes from native (Kandelia obovata) and introduced (Sonneratia apetala) mangroves.
Analysis of genomic and functional profiles, including Average Genome Size (AGS) and gene abundances.
Identification of environmental drivers using statistical analysis.

Main Results

Introduced mangroves had larger Average Genome Size (AGS) and higher functional diversity but reduced potential for methane, nitrogen fixation, and sulfur cycling.
Proteobacteria showed distinct functional profiles and higher AGS in introduced mangrove rhizospheres.
Salinity and ammonium were key environmental factors influencing microbial functions via deterministic processes.

Conclusions

Introduced mangrove species significantly alter rhizosphere microbial communities and their biogeochemical functions.
Environmental selection, particularly salinity and ammonium, plays a critical role in shaping these functional shifts.
Findings offer insights for optimizing mangrove reforestation strategies to enhance ecosystem functioning.

Keywords:

average genome size functional potential mangrove rhizosphere metagenome metagenome‐assembled genome

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