Direct and indirect resistance of sugarcane to Diatraea saccharalis induced by jasmonic acid.

摘要: Treating plants with synthetic jasmonic acid (JA) induces a defensive response similar to herbivore attack, and is potential strategy for integrated pest management. Despite the importance of sugarcane, its JA-induced defences have not yet been studied. We investigated effects JA treatment on direct indirect resistance sugarcane key-pest specialist Diatraea saccharalis generalist Spodoptera frugiperda. Indirect were examined by testing attraction Cotesia flavipes, sugarcane-borer parasitoid, volatile. The results showed that JA-treated did affect weight gain two larvae. However, in dual-choice assays, both species preferred feed mock rather than plants. Leaf colorimetric analyses visual cues are unlikely be involved larval preference, whereas from olfactometric assays revealed D. over plant volatiles. After 48 h treatment, emitted volatile blend attractive C. comprised mainly sesquiterpenes. parasitoid discriminate host-damaged When wasps given choice between + plants, they latter, which more complex blend, suggesting likely does hamper host-finding. concluded emission volatiles borer as well an antixenosis type against pests, although neither nor alone underlying mechanism.