Plant biology and physiology, Biologie et physiologie végétales, Sciences biologiques et medicales, Biological and medical sciences, Sciences biologiques fondamentales et appliquees. Psychologie, Fundamental and applied biological sciences. Psychology, Physiologie vegetale et developpement, Plant physiology and development, Angiospermae, Arthropoda, Delphacidae, Enzyme, Enzima, Fulgoromorpha, Gramineae, Homoptera, Insecta, Invertebrata, Monocotyledones, Spermatophyta, Bactérie, Bacteria, Hydroperoxyde, Hydroperoxide, Hidroperóxido, Lyases, Oryza sativa, Résistance induite, Induced resistance, Resistencia inducida, Sogatella furcifera, (2E,6Z)-nonadienal, (E)-2-hexenal, C6 volatiles, hydroperoxide lyase, and induced resistance
A pre-infestation of the white-backed planthopper (WBPH), Sogatella furcifera Horváth, conferred resistance to bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo) in rice (Oryza sativa L.) under both laboratory and field conditions. The infestation of another planthopper species, the brown planthopper (BPH) Nilaparvata lugens Stål, did not significantly reduce the incidence of bacterial blight symptoms. A large-scale screening using a rice DNA microarray and quantitative RT-PCR revealed that WBPH infestation caused the upregulation of more defence-related genes than did BPH infestation. Hydroperoxide lyase 2 (OsHPL2), an enzyme for producing C6 volatiles, was upregulated by WBPH infestation, but not by BPH infestation. One C6 volatile, (E)-2-hexenal, accumulated in rice after WBPH infestation, but not after BPH infestation. A direct application of (E)-2-hexenal to a liquid culture of Xoo inhibited the growth of the bacterium. Furthermore, a vapour treatment of rice plants with (E)-2-hexenal induced resistance to bacterial blight. OsHPL2-overexpressing transgenic rice plants exhibited increased resistance to bacterial blight. Based on these data, we conclude that OsHPL2and its derived (E)-2-hexenal play some role in WBPH-induced resistance in rice.