Agricultural and Biological Chemistry · 1985 · 36 citations · 1 references
Life SciencesPlant BiologyPlant SciencesPlant BiochemistryPlant PhysiologyPlant-microbe InteractionsChemical Defense In PlantsFungal PathogenesisPlant Defense ResponsesPlant PathogenesisPlant-pathogen InteractionsDefense-related PhenylpropanoidsGerm Tube FormationPhytoalexin BiosynthesisPlant Defense CompoundsSpore Germination Physiology
Oryzalexins A, B and C were isolated as a group of novel phytoalexins from rice (Oryza sativa) blast leaves infected with Pyricularia oryzae. The basis of the structures of Oryzalexins A, B and C was laid by spectroscopic methods and their inhibitory activities against spore germination and germ tube growth of P. oryzae were assayed. Oryzalexins A, B and C, isolated from rice leaves infected with P. oryzae as a group of novel phytoalexins, were confirmed to be (+)-sandaracopimaradiene derivatives by chemical and spectroscopic studies, i.e. A: 3-oxy-7-oxo- (I); B: 3-oxo-7-oxy- (II) and C: 3,7-dioxo-(+)-sandaracopimaradiene (III).
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