Figure 3.

VOC profile of ISR-inducing strains GB03 (black boxes) and IN937a (white boxes) compared with the noninducing strain DH5α (gray boxes). Compounds positively identified include 3-hydroxy-2-butanone, 2,3-butanediol, tetramethyl pyrazine, and the hydrocarbons decane, undecane, decanal, dodecane, 2-undecanone, 2-tridecanone, and 2-tridecanol. Different letters indicate significant differences between treatments according to lsd at P = 0.05. An asterisk indicates that emissions were below detection limits.