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To gain a better understanding of the effects of tobacco root secretions on the nifH gene community of rhizosphere soil, the diversity of the nifH gene in the rhizosphere and non-rhizosphere soil of tobacco was investigated using denaturing gradient gel electrophoresis (DGGE) and sequencing. Shannon diversity (H), richness (S) and evenness (EH) indices were used to analyze the DGGE results...
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