Cyclic Dipeptides from BS07 Require Key Components of Plant Immunity to Induce Disease Resistance in Against Infection
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Cyclic dipeptides (CDPs) are one of the simplest compounds produced by living organisms. Plant-growth promoting rhizobacteria (PGPRs) also produce CDPs that can induce disease resistance. strain BS07 producing various CDPs has been evaluated as a potential biocontrol agent against multiple plant pathogens in chili pepper. However, plant signal pathway triggered by CDPs has not been fully elucidated yet. Here we introduce four CDPs, cyclo(Gly-L-Pro) previously identified from sp., and cyclo(L-Ala-L-Ile), cyclo(L-Ala-L-Leu), and cyclo(LLeu-L-Pro) identified from BS07, which induce disease resistance in against infection. The CDPs do not directly inhibit fungal and oomycete growth . These CDPs require , , and important for salicylic acid-dependent defense to induce resistance. On the other hand, regulators involved in jasmonate-dependent event, such as , , and , are necessary to the CDP-induced resistance. Furthermore, treatment of these CDPs primes plants to rapidly express at early infection phase. Taken together, we propose that these CDPs from PGPR strains accelerate activation of jasmonate-related signaling pathway during infection.
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