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(A) DGGE profiles of partial bacterial 16S rRNA gene sequences. (B) Principal component analysis (PCA) of bacterial community based on DGGE profiles. B and W represent soil sample before cucumber planting and control, respectively. T1, T2, T3 and T4 represent soil treated with 0.1, 0.25, 0.5, 1.0 µmol p-coumaric acid/g soil, respectively.
