Lemon balm (Melissa officinalis L.) is one of the rare medicinal plants in Tunisia. It was found only in two sites in the north of Tunisia with a small number of plants. The study of germination under the NaCl and PEG effect showed that Tunisian lemon balm seeds were sensitive to saline and osmotic stress. Morphological and biochemical characterizations of Tunisian M. officinalis were performed. Results showed that the Tunisian populations presented plants with long, broad leaves and weak branching. The major constituent in leaf essential oil was germacrene-D with a percentage ranging from 29.17 to 24.6%, and the major fatty acids were polyunsaturated fatty acids, linoleic acid, ranging from 73.93 to 66.74%. The phenolic content of M. officinalis extract varied significantly among origins which could explain the high variation in antiradical scavenging activity. The evaluation of allelopathic activities showed that the extract of the lemon balm leaves presented an allelopathic effect with the majority of the tested seeds.

中文翻译：

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Melissa officinalis L. 的植物提取物价值通过其生化特性和生物活性用于农业工业用途

柠檬香脂（Melissa officinalis L.）是突尼斯稀有的药用植物之一。它仅在突尼斯北部的两个地点发现，植物数量很少。NaCl和PEG作用下的萌发研究表明，突尼斯香蜂草种子对盐分和渗透胁迫敏感。进行了突尼斯厚朴的形态学和生化表征。结果表明，突尼斯种群呈现长而宽的叶子和弱分枝的植物。叶精油的主要成分为锗烯-D，含量为29.17～24.6%，主要脂肪酸为多不饱和脂肪酸亚油酸，含量为73.93～66.74%。M的酚含量 不同来源的厚朴提取物差异很大，这可以解释抗自由基清除活性的高度变化。化感活性的评价表明，香蜂草叶提取物对大多数受试种子具有化感作用。