Fig. 6. Number of bands detected by 16S rDNA denaturing gradient gel electrophoresis (DGGE) analysis of rhizosphere bacteria in white lupine at 27 days after transplanting (DAT) under ambient (A) and elevated (E) CO₂ concentrations. To equalize the band numbers detected among all gels, the relative numbers based on young cluster roots of the ambient CO₂ and +P treatment (=1.0) are shown.