DGGE of 16S rRNA genes of bacterial communities from agricultural soils. A. DGGE of bacterial communities from North Chagres (lanes N1-N3), South Chagres (lanes S1-S3), Ñilhue (lanes Ñ1-Ñ3) and La Vinilla (V1-V3). B. Dendrogram showing cluster analysis of 16S rRNA gene profiles of bacterial communities from the four agricultural soils. Gel image analysis was performed by using Phoretix 1D software package. Bands were automatically detected and manually corrected. A binary matrix was generated by presence or absence bands. The sample similarities were analyzed by MVSP.