C. gloeosporioides accession 36326 was provided by the Agricultural Culture Collection of China. The pure culture isolate was grown on potato dextrose agar (PDA) at 28 C for up to 7 days prior to use.
Bacterial strains were obtained from the rhizosphere soil associated with the Shandong YingYangYuan Food Technology Co. Ltd., Jinan, China. For use in experiments, the strains were grown on nutrient agar (NA) incubated at 37 C for 1–2 days. A suspension was created by gently scraping the bacterial lawn from NA and diluting with water to approximately 106 cfu mL1, as assessed with McFarland Turbidity Standards.
Screening for bacteria producing volatile antimicrobials
All of the bacteria isolated from soil were tested for antagonistic activity in two-compartment plastic plates (Kai et al., 2007). For the fumigation assay against C. gloeosporioides, the PDA medium was poured into one side of the plates (92 16 mm; Sarstedt AG, Nürnbrecht, Germany) and the NA medium was poured into the opposing sector. Each isolated bacteria (50 lL; 1 106 cfu mL1)was innoculated on the NA medium side of the plate and incubatedfor 1 day at 37 C. Subsequently, an agar plug (U 5 mm) of C. gloeosporioides was pla ced on the PDA sector. Sterile distilled water was used as the control factor instead of the isolated bacterial. The plates were sealed with parafilm, incubated for 5 days at 28 C
and the diameter of C. gloeosporioides expansion was measured.
Each experiment was performed with three replications and the
experiment was repeated three times.