Phytotoxic Terpenoids from Ligularia cymbulifera Roots.
Phytotoxic Terpenoids from Ligularia cymbulifera Roots.
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橐吾根中的植物毒性萜类化合物
DOI：
10.3389/fpls.2016.02033
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发表时间：
2016
影响因子：
5.6
通讯作者：
Hao XJ
中科院分区：
文献类型：
--
作者：
Chen J;Zheng G;Zhang Y;Aisa HA;Hao XJ
白花女贞子是横断山区的优势种之一，中国，导致该地区牧草数量的减少。然而，人们对其优势背后的机制知之甚少。在本研究中，从羊栖菜的根中分离得到两个新的木犀草素倍半萜，即木犀草素A和木犀草素B(1和2)，以及其他7个已知的萜类化合物(3-9)。1和2的结构经光谱分析和单晶X-射线衍射法确证。结果表明，每一种化合物对拟南芥均具有一定的植物毒性，并在根际土壤中进行了检测和鉴定。化合物3的毒性最强，对幼苗生长(EC_(50)=30.33±0.94μg/m L)和种子萌发(EC_(50)=155.13±0.52μg/m L)均表现出明显的抑制作用，根际土壤中的平均含量为3.44μg/g，表明紫草根中的萜类化合物可能以植物毒素的形式释放到根际土壤中干扰邻近植物。
Ligularia cymbulifera is one of the predominant species in the Hengduan Mountains, China, and has led to a decrease in the amount of forage grass in this area. However, little is known about the mechanism behind its predominance. In this study, two novel eremophilane sesquiterpenes, ligulacymirin A and B (1 and 2), together with seven other known terpenoids (3–9), were isolated from the roots of L. cymbulifera. The structures of 1 and 2 were determined by spectroscopic methods and single-crystal X-ray diffraction. Each compound showed phytotoxic activities against Arabidopsis thaliana, and each was detected and identified in rhizosphere soil by UHPLC-MS. Compound 3 was the most potent phytotoxin, showing remarkable inhibition against both seedling growth (EC50 = 30.33 ± 0.94 μg/mL) and seed germination (EC50 = 155.13 ± 0.52 μg/mL), with an average content in rhizosphere soil of 3.44 μg/g. These results indicate that terpenoids in L. cymbulifera roots might be released as phytotoxins in rhizosphere soil to interfere with neighboring plants.
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