The Invasive Brazilian Pepper Tree (Schinus terebinthifolius ) Is Colonized by a Root Microbiome Enriched With Alphaproteobacteria and Unclassified Spartobacteria

Frontiers in Microbiology
Karim Dawkins, Nwadiuto Esiobu

Abstract

Little is known about the rhizosphere microbiome of the Brazilian pepper tree (BP) - a noxious category 1 invasive plant inducing an enormous economic and ecological toll in Florida. Some invasive plants have been shown to drastically change the soil microbiome compared to other native plants. The rhizobacteria community structure of BP, two Florida native plants (Hamelia patens and Bidens alba) and bulk soils were characterized across six geographical sites. Although all 19 well-known and 10 poorly described phyla were observed in all plant rhizospheres, BP contained the least total bacterial abundance (OTUs) with a distinct bacteria community structure and clustering patterns differing significantly (pCOA and PERMANOVA) from the natives and bulk soil. The BP rhizosphere community contained the highest overall Proteobacteria diversity (Shannon's diversity 3.25) in spite of a twofold reduction in richness of the Gammaproteobacteria. Remarkably, the invasive BP rhizosphere was highly enriched with Alphaproteobacteria, dominated by Rhizobiales, including Rhodoplanes and Bradyrhizobiaceae. Also, the relative abundance of Spartobacteria under BP rhizosphere was more than twice that of native plants and bulk soil; featuring unique m...Continue Reading

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Datasets Mentioned

BETA
338194

Methods Mentioned

BETA
chemical treatment
PCR
electrophoresis
Illumina sequencing
amplicon sequencing

Software Mentioned

R
QIIME
UCLUST
vegan R package
R gplots
CosmosID

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