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Growth of broccoli (A–D) and lettuce (E–H) seedlings in absence (A,B,E,F, respectively) and in presence (C,D,G,H, respectively) of volatile compounds produced by strain NCPPB2192 of Pseudomonas tolaasii in Petri dishes not sealed (A,C,E,G) and sealed (B,D,F,H) with parafilm.
