Preliminary Mechanism of Tobacco cis-Abienol in Inducing Resistance against Bacterial Wilt in Tomato

Bacterial wilt negatively impacts the yield and quality of tomatoes. cis-Abienol, a labdane diterpenoid abundantly produced in the trichome secretion of Nicotiana spp., could induce bac-terial wilt resistance in plants, yet study on its practical application and acting mechanism is much limited.cis-Abienol can enhance the antioxidant enzyme activity and stimulate the defensive signal transduction in tomato roots, leading to the upregulation of genes involved in the mito-gen-activated protein kinase cascade. It also up-regulated the expression of JAZ genes and in-creased the content of JA and SA, which control the expression of flavonoid biosynthetic genes and the content of phytoalexins in tomato roots. cis-Abienol-induced resistance mainly depends on the JA signaling pathway, and SA signaling pathway is also involved in this process. This study established the feasibility of applying the plant-derived terpenoid cis-abienol to induce plant bacterial wilt resistance, which is of great value in developing eco-friendly bactericide.