Mechanism of Oxidative Burst in Tobacco Leaves and Cells Induced by Palmin from Phytophthora palmi Screening and Identification of a Sponge-associated Fungus HMP-F66 Inducing Oxidative Burst in Tobacco Cell Suspensions Elicitation of the Hypersensitive Responses in Tabacco by a10.6 kD Proteinaceous Elicitor from Phytophthora palmi ACTIVE OXYGEN SPECIES GENERATING IN PLANT DEFENSE AGAINST PATHOGENS