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The root bark of Zanthoxylum dipetalum contained the alkaloids canthin-6-one, chelerythrine, nitidine and tembetarine, the pyranocoumarins avicennol and xanthoxyletin, the triterpene lupeol and the flavanoid hesperidin. The MS fragmentation pattern for avicennol is discussed and a tentative structure is proposed for a third coumarin, designated ZD/1. The root wood of the type species and the stem bark of the γ variety contained most of the above compounds plus sitosterol and, in the root wood only, magnoflorine. The chemotaxonomic implications of these findings are briefly discussed. 相似文献
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Iturbe-Ormaetxe I Haralampidis K Papadopoulou K Osbourn AE 《Plant molecular biology》2003,51(5):731-743
Cloning of OSCs required for triterpene synthesis from legume species that are amenable to molecular genetics will provide tools to address the importance of triterpenes and their derivatives during normal plant growth and development and also in interactions with symbionts and pathogens. Here we report the cloning and characterization of a total of three triterpene synthases from the legume species Medicago truncatula and Lotus japonicus. These include a -amyrin synthase from M. truncatula (MtAMYI) and a mixed function triterpene synthase from Lotus japonicus (LjAMY2). A partial cDNA predicted to encode a -amyrin synthase (LjAMY1) was also isolated from L. japonicus. The expression patterns of MtAMY1, LjAMY1 and LjAMY2 and of additional triterpene synthases previously characterised from M. truncatula and pea differ in different plant tissues and during nodulation, suggesting that these enzymes may have distinct roles in plant physiology and development. 相似文献
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L.B.de Silva W.H.M.W. Herath R.C. Jennings M. Mahendrant G.E. Wannigama 《Phytochemistry》1982,21(5):1173-1175
A methanolic extract of the plant Elephantopus scaber was found to contain lupeol, stigmasterol and a new germacranolide dilactone 11,13-dihydrodeoxyelephantopin. 相似文献
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Lupeol, lup-(20)29-ene-2α,3β-diol and a new triterpenic alcohol olean-(13)18-ene-2β,3β-diol were isolated from the petrol extract of air dried Salvia horminum and their structures were determined. 相似文献
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This study examined the effect of triterpenoid on the salt tolerance of lanosterol synthase deficient yeast mutant GIL77. The expression of the triterpenoid synthase gene under GAL1 promoter in GIL77 increased the triterpenoid concentration of both whole cell and plasma membrane fractions. Without the induction of the genes, the growth curve of BgbAS or RsM1 transformant depicted patterns similar to control cells in both the presence and absence of salt with growth inhibition at 500 mM NaCl. The induction of BgbAS and RsM1 gene expression slightly repressed growth compared with control cells in the absence of NaCl. The growth of GIL77 was significantly suppressed by the expression of BgbAS or RsM1 under salinity conditions. Of the triterpenoid synthase genes, BgbAS rather than RsM1 was found to strongly inhibit the growth of GIL77 cells under salt stressed conditions. The expression of the triterpenoid synthase gene in GIL77 also influenced their tolerance to other abiotic stresses. In contrast to the endogenous synthesis, the exogenous supply of triterpenoid in the culture medium appeared to occur in the plasma membrane fraction and enhanced the salt tolerance of GIL77. This study thus discussed the physiological significance of triterpenoid in relation to its possible role in modulating salt tolerance. 相似文献
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从苏门答腊金合欢(Acacia sum a Buch-Ham . ex Wall.)树皮干粉的热乙醇提取液中分离到6个化合物,其中4个通过光谱和理化方法鉴定为:正三十烷醇(1)、羽扇豆庚酸酯(2)、β-谷甾醇(3)和胡萝卜甙(5)。化合物2是新化合物,命名为羽扇豆庚酸酯。这些化合物均首次从苏门答腊金合欢中分离得到 相似文献
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