Abstract
Antibacterial activity of 7 sesquiterpenoids (glutinosone, occidenol, occidentalol, phytuberin, phytuberol, solanascone, and solavetivone) elicited, by Pseudomonas solanacearum or tobacco mosaic virus in tobacco leaves was determined. The activity was assayed on a thin-layer chromatogram plate by coating agar medium seeded with Pseudomonas solanacearum or P. syringae pv. tabaci and 2, 3, 5, -triphenyltetrazoliumchloride solution. Glutinosone, solanascone, and solavetivone were highly antibacterial, occidenol and occidentalol were the next, and phytuberin and phytuberol were weakly antibacterial. When these compounds were examined by the paper-disk bioassay, none of them showed antibacterial activity to P. solanacearum or P. syringae pv. tabaci but glutinosone, occidenol, occidentalol, and solavetivone showed antibacterial activity to Bacillus subtilis and the inhibition zone by occidentalol was significantly smaller than ones by the others.
