The genus Teucrium includes perennial herbs or shrubs widespread all around the world. The wall germander (Teucrium chamaedrys L.) is widely used in traditional and modern medicine for various health disorders and recent research revealed that serpentine populations of this herb have increased antioxidant and respective medical potential compared with calcareous population. The present study aims to elucidate further the role of phenolic compounds for T. chamaedrys growth on serpentine soil. Methanol extracts from two serpentine and two non-serpentine (calcareous and siliceous) Bulgarian populations were obtained and analysed for total quantity of phenolics and flavonoids, and antioxidant activity. The serpentine soils acted as an elicitor of the antioxidant response in T. chamaedrys plants and the increased phenolics level correlated with enhanced antioxidant activity. The calcareous population had lower values but still higher than the siliceous population which had the lowest antioxidant values, although the flavonoid quantity that was equal to the serpentine populations. A gas chromatography-mass spectrometry (GC-MS) assay for identifying phenolic acids pointed to caffeic acid as a dominant compound, with additional cinnamic and benzoic acid derivatives with putative roles as antioxidants, in cell wall lignification for heavy metals chelation, and for interspecies interactions.

中文翻译：

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酚类物质在蛇纹石土壤中紫杉（唇形科）种群中的重要性

Teucrium 属包括遍布世界各地的多年生草本或灌木。壁姜 (Teucrium chamaedrys L.) 在传统和现代医学中广泛用于治疗各种健康障碍，最近的研究表明，与钙质群体相比，这种草药的蛇纹石群体具有更高的抗氧化能力和各自的医疗潜力。本研究旨在进一步阐明酚类化合物对蛇纹石土壤上金缕梅生长的作用。从两个蛇纹石和两个非蛇纹石（钙质和硅质）保加利亚种群中获得甲醇提取物，并分析了酚类和黄酮类化合物的总量以及抗氧化活性。蛇纹石土壤作为 T 抗氧化反应的诱导剂。chamaedrys 植物和增加的酚类物质水平与增强的抗氧化活性相关。钙质种群具有较低的值，但仍高于具有最低抗氧化值的硅质种群，尽管黄酮类化合物的数量与蛇纹石种群相同。用于鉴定酚酸的气相色谱-质谱 (GC-MS) 分析表明，咖啡酸是主要化合物，另外还有肉桂酸和苯甲酸衍生物具有抗氧化剂的作用，用于重金属螯合的细胞壁木质化和种间相互作用。