Supplementary Figure 1: Chromatographic profiles of volatiles released from B. subtilis PGPR strain GBO3 (A), and uninoculated media (B)

Compounds positively identified include acetoin (1), 2,3-butanediol (2), decanal (3), decane (4), tetramethyl pyrazine (5), and undecane (6). Highlighted in blue is the earlier elution region where most identified bioactive volatiles are eluted including 1, acetoin and 2, 2,3-butanediol. Peaks commonly released from media include some short chain hydrocarbons and tetramethylpyrazine (s).