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Callus cultures have been established from root explants of aseptically-grown Podophyllum hexandrum seedlings. A fully defined medium based on Gamborg's B5 salts supplemented with 2/4-dichlorophenoxyacetic acid, gibberellic acid and 6-benzylaminopurine was effective for both initiation and sustained growth of callus tissue. Cultures produced anticancer(More)
This review covers recently-published experimental information on the biosynthesis of terpenoids in the range C5-C25. In addition to sections on the mevalonate and mevalonate-independent (deoxyxylulose phosphate) pathways, the review considers in turn hemiterpenoids, polyprenyl diphosphate synthases, monoterpenoids, sesquiterpenoids, diterpenoids, and(More)
Several podophyllotoxin-related lignans have been shown to possess significant antifungal activity against a number of filamentous fungi. Initial structure-activity studies indicate this action is sensitive to change at the 4 and 4' positions of the podophyllotoxin skeleton. Good correlation has been observed between antifungal action and the ability to(More)
Fusarium sporotrichioides and Gibberella saubinetti O-demethylate 3,9-dimethoxypterocarpan to 3-methoxy-9-hydroxypterocarpan and then 3,9-dihydroxypterocarpan. F. anguioides Sherb., F. avenaceum and F. graminearum convert the same substrate to a mixture of 3-methoxy-9-hydroxypterocarpan and 3-hydroxy-9-methoxypterocarpan. Induction of pterocarpan(More)
The biosynthesis of gallic acid in a number of higher plants was investigated by using l-[U-(14)C]phenylalanine, (-)-[G-(14)C]shikimic acid, d-[1-(14)C]glucose and d-[6-(14)C]glucose as tracers. The results are compared with those obtained similarly for caffeic acid and are interpreted in terms of the dehydrogenation of 5-dehydroshikimic acid as a normal(More)
The trichothecene mycotoxin 3-acetyldeoxynivalenol was transformed by cultures of the diacetoxyscirpenol producer Fusarium sp. strain C37410-90 into four compounds, identified as deoxynivalenol, 15-acetyldeoxynivalenol, 3,15-diacetyldeoxynivalenol and fusarenon-X. The major transformations are the result of specific esterification and de-esterification(More)