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Heterodera glycines  is one of the most destructive pathogens of soybean. Soybean seeds coated with  Bacillus simplex  Sneb545 have shown resistance to  H. glycines  as a result of induced systemic resistance (ISR) in the plants. In this study, we aimed to identify the resistance-inducing determinants from this  B. simplex  strain. Combining the ISR bioassay, six ISR-active compounds were isolated from a culture of  B. simplex  Sneb545 using organic solvent gradient extraction, silica gel column chromatography, Sephadex LH-20 column chromatography, and semi-preparative high-performance liquid chromatography (HPLC), and all systems were based on activity tracking. The compounds were determined as cyclic(Pro-Tyr), cyclic(Val-Pro), cyclic(Leu-Pro), uracil, phenylalanine, and tryptophan using  1 H NMR and  13 C NMR. In plants from seeds coated with  Bacillus simplex  Sneb545, these six ISR-active compounds delayed the development of  H. glycines  in soybean roots. Moreover, cyclic(Pro-Tyr), cyclic(Val-Pro), and tryptophan reduced the number of nematodes in soybean roots. The expression levels of defense-related genes with cyclic(Val-Pro), tryptophan and uracil treatment soybean analysed using Quantitative real-time PCR (qRT-PCR). The results indicate cyclic(Val-Pro), tryptophan and uracil induced the expression of defense-related genes involved in the SA- and JA-pathways to against  H. glycines . Our research results provide new agents for the control of  H. glycines .

Isolation and identification of induced systemic resistance determinants from Bacillus simplex Sneb545 against Heterodera glycines