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农林复合系统滇龙胆茎叶化学计量特征研究

DOI: 10.11913/PSJ.2095-0837.2015.40472, PP. 472-481

Keywords: 滇龙胆,农林复合系统,茎叶,色谱指纹图谱,化学计量特征

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Abstract:

?以农林复合系统种植的滇龙胆(GentianarigescensFranch.exHemsl.)为材料,采用高效液相色谱法建立不同栽培系统滇龙胆茎、叶的色谱指纹图谱,并测定其主要活性成分马钱苷酸、獐牙菜苦苷、龙胆苦苷和当药苷含量,研究不同栽培系统滇龙胆茎、叶化学计量特征。采用相关性分析、指纹图谱相似度分析、偏最小二乘判别分析(PLS-DA)、变量投影重要性准则(VIP)等方法进行化学数据分析。结果显示,滇龙胆主要活性成分马钱苷酸含量为(1.85±0.92)mg/g~(7.43±7.64)mg/g,獐牙菜苦苷含量为(1.03±0.17)mg/g~(1.58±0.50)mg/g,龙胆苦苷含量为(15.28±11.34)mg/g~(24.59±7.84)mg/g,当药苷含量为(4.10±1.64)mg/g~(31.67±22.70)mg/g,且叶片中4种活性成分的总含量高于茎;不同栽培系统中,与尼泊尔桤木间作的滇龙胆茎、叶活性成分总含量最高,而与核桃间作的滇龙胆茎、叶活性成分总含量最低。相关性分析显示,植株相同部位和不同部位间的环烯醚萜和裂环烯醚萜含量呈显著(P<0.05)或极显著(P<0.01)正相关。指纹图谱相似度分析表明,不同栽培系统滇龙胆茎指纹图谱相似度介于0.989~0.992之间、叶指纹图谱相似度为0.988~0.996,相同部位样品化学成分种类相似。PLS-DA分析结果表明,茎和叶片整体化学计量特征具有明显差异;单作及林药间作的样品被区分为不同类群,不同间作模式下滇龙胆茎、叶化学成分具显著差异,叶片高效液相色谱指纹图谱可用于区分不同栽培系统滇龙胆样品。本研究结果可为农林复合系统滇龙胆有效成分含量研究及滇龙胆资源的合理开发利用提供科学依据。

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