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首页> 外文期刊>Biochemical Systematics and Ecology >Leaf flavonoid glycosides as chemosystematic characters in Ocimum
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Leaf flavonoid glycosides as chemosystematic characters in Ocimum

机译：叶黄酮苷在罗汉果中的化学系统特征

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摘要

Thirty-one accessions of nine species belonging to three subgenera of Ocimum (basil, family Lamiaceae) were surveyed for flavonoid glycosides. Substantial infraspecific differences in flavonoid profiles of the leaves were found only in O. americanum, where var. pilosum accumulated the flavone C-glycoside, vicenin-2, which only occurred in trace amounts in var. americanum and was not detected in cv. Sacred. The major flavonoids in var. americanum and cv. Sacred, and also in all other species investigated for subgenus Ocimum, were flavonol 3-O-glucosides and 3-O-rutinosides. Many species in subgenus Ocimum also produced the more unusual compound, quercetin 3-O-(6"-O-malonyl)glucoside, and small amounts of flavone O-glycosides. The level of flavonol glycosides produced was reduced significantly in glasshouse-grown plants, but levels of flavone glycosides were unaffected. A single species investigated from subgenus Nautochilus, O. lamiifolium, had a different flavonoid glycoside profile, although the major compound was also a flavonol O-glycoside. This was identified as quercetin 3-O-xylosyl(l"'-->2")galactoside, using NMR spectroscopy. The species investigated from subgenus Gymnocimum, O. tenuiflorum (=O. sanctum), was characterised by the accumulation of flavone O-glycosides. These were isolated, and identified as the 7-O-glucuronides of luteolin and apigenin. Luteolin 5-O-glucoside was found in all nine species of Ocimum studied, and is considered to be a key character for the genus.
机译：调查了属于Ocimum（亚科）的三个亚属的9个物种的31个种质的黄酮苷。叶片中类黄酮的亚种差异很大，仅在美洲大麦中存在。毛绒球菌积累了黄酮C-糖苷，Vicenin-2，仅在痕量var中发生。 Americanum，在简历中未检测到。神圣。 var中的主要类黄酮。美洲和简历。黄酮醇3-O-葡萄糖苷和3-O-芸香糖苷是神圣的，也是在所有其他属于Ocimum属的其他物种中也是如此。 Ocimum亚属中的许多物种还产生了更不寻常的化合物槲皮素3-O-（6“ -O-丙二酰基）葡萄糖苷和少量的黄酮O-糖苷。在温室种植的植物中，黄酮醇苷的含量大大降低。但是，黄酮糖苷的水平没有受到影响，从Nautochilus亚种O. lamiifolium中调查的一个物种具有不同的类黄酮糖苷谱，尽管主要化合物也是黄酮醇O-糖苷，被鉴定为槲皮素3-O-木糖基（l“'-> 2”）半乳糖苷，使用核磁共振波谱法。从黄花木（O. tenuiflorum，= O。sanctum）亚属调查的物种，其特征在于黄酮O-糖苷的积累，并进行了分离和鉴定作为木犀草素和芹菜素的7-O-葡糖醛酸苷，在所有研究的9种Ocimum中都发现了木犀草素5-O-葡糖苷，被认为是该属的关键特征。

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