| 摘要 |
<p>PURPOSE: To obtain a partially new antimicrobial terpene compound in high yield by producing an antimicrobial terpene compound by adding the microbial extract derived from plant pathogenic fungi to a rice callus culture fluid followed by isolating the compound. CONSTITUTION: A rice callus culture fluid is spiked with an microbial extract derived from plant pathogenic fungi such as rice neck rot or potato disease fungi as a phytocassane or momilactone-inducing substance to effect producing phytocassane or momilactone as a terpene compound presenting antimicrobial activity on rice neck rot fungi followed by isolating the compound, thus affording the objective new antimicrobial terpene compound, i.e., phytocassane A, B, C or D of formula I (R1 is H or OH; R2 is H, OH or O) or momilactone A of formula II or momilactone B of formula III. The phytocassane A, B, C or D is a naturally occurring substance, being effective on rice neck rot and rice sheath blight and useful as a low-toxic, pollution-free antimicrobial agent. The momilactone A or B, which suppresses rice seed germination, is effective on rice neck rot.</p> |
