Characterization and comparison of the bacterial communities of rhizosphere and bulk soils from cadmium-polluted wheat fields

PeerJ
Li SongGuisheng Zhou

Abstract

Cadmium pollution is becoming a serious problem due to its nondegradability and substantial negative influence on the normal growth of crops, thereby harming human health through the food chain. Rhizospheric bacteria play important roles in crop tolerance. However, there is little experimental evidence which demonstrates how various cadmium concentrations affect the bacterial community in wheat fields including rhizosphere microorganisms and nonrhizosphere (bulk) microorganisms. In this study, 16S rRNA amplicon sequencing technology was used to investigate bacterial communities in rhizosphere and bulk soils under different levels of pollution in terms of cadmium concentration. Both the richness and diversity of the rhizosphere microorganism community were higher under nonpolluted soil and very mild and mild cadmium-contaminated soils than compared with bulk soil, with a shift in community profile observed under severe cadmium pollution. Moreover, cadmium at various concentrations had greater influence on bacterial composition than for the nonpolluted site. In addition, redundancy analysis (RDA) and Spearman's analysis elucidated the impact of exchangeable Cd and total Cd on bacterial community abundance and composition. This st...Continue Reading

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Citations

Apr 23, 2021·Environmental Science and Pollution Research International·Li SongGuisheng Zhou

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Datasets Mentioned

BETA
PRJNA661129

Methods Mentioned

BETA
PCR

Software Mentioned

ADONIS
Trimmomatic
PICRUSt
ggplot2
FLASH
ade4
pheatmap
Vsearch
OmicShare
QIIME

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