Rhizosphere microbiomes and carbon dynamics in mangrove ecosystems are shaped by host species, patch age, and environmental drivers
Abstract
Mangrove rhizosphere bacterial communities play critical roles in organic matter remineralization and carbon dynamics. This study characterized the rhizosphere bacteriomes of 11 major mangrove species, from the estuarine regions of Mandovi and Zuari in Goa, India, using target-specific 16S rRNA amplicon sequencing. The dominant rhizosphere bacterial phyla included Proteobacteria, Planctomycetes, Bacteroidetes, Chloroflexi, and unclassified taxa. FAPROTAX-based functional analysis indicated that these microbial taxa were largely associated with chemoheterotrophy, sulfate reduction, fermentation, and nitrogen cycling. Canonical correspondence analysis showed that environmental parameters temperature, total organic carbon, active carbon pool and lability index was correlated with younger mangrove patches. However, the passive carbon pool showed a correlation with older mangrove patches which were about forty to eighty years. This study provides an understanding of the significant role of rhizosphere microbial communities and long-term carbon storage potential, which is of ecological importance that can greatly reduce the impacts of climate change.
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