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The ammonium sulfate-precipitated fraction from mycelia and culture-filtrates and the crude, cell-free culture filtrates from the growth medium of the fungiChrysosporium palmorum, Eurotium rubrum, Micromucor isabellina, andPythium aphanidermatum when aseptically added to cell suspensions ofCantharanthus roseus caused a rapid and dramatic increase in indole alkaloid biosynthesis. Up to 400 μg/L ajmalicine and 600 μg/L catharanthine were detected in C.roseus cell suspension grown in the presence of theM. isabellina fungal culture filtrate for 3 d. Untreated cells produced only trace levels of ajmalicine and catharanthine per liter of cell suspension after 15 d of culture.  相似文献   
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