Figure 9. Quantitative real time PCR analysis of the effects of carot-4-en-9,10-diol and quorum sensing inhibitors on plaI (A) and plaR (B) gene expression in B. plantarii.

B. plantarii was incubated in PDB containing 20 µM carot-4-en-9,10-diol, 50 µM 3-methyl-2(5H)-furanone, or 100 µM DMDS. Control as PDB containing solvent only. Values are means ± SD (shown as error bars) (n = 3). *P<0.01, **P<0.001 by Student’s-t test.