Essential oils represent novel alternatives to application of synthetic fungicides to control against seedborne pathogens. This study investigated seven essential oils for in vitro growth inhibition of the main seedborne pathogens of cucurbits. Cymbopogon citratus essential oil completely inhibited mycelial growth of Stagonosporopsis cucurbitacearum and Alternaria alternata at 0.6 and 0.9 mg/mL, respectively. At 1 mg/mL, Lavandula dentata, Lavandula hybrida, Melaleuca alternifolia, Laurus nobilis, and two Origanum majorana essential oils inhibited mycelia growth of A. alternata by 54%, 71%, 68%, 36%, 90%, and 74%, respectively. S. cucurbitacearum mycelia growth was more sensitive to Lavandula essential oils, with inhibition of ~74% at 1 mg/mL. To determine the main compounds in these essential oils that might be responsible for this antifungal activity, they were analyzed by gas chromatography–mass spectrometry (GC-MS). C. citratus essential oil showed cirtal as its main constituent, while L. dentata and L. nobilis essential oils showed eucalyptol. The M. alternifolia and two O. majorana essential oils had terpinen-4-ol as the major constituent, while for L. hybrida essential oil, this was linalool. Thus, in vitro, these essential oils can inhibit the main seedborne fungi of cucurbits, with future in vivo studies now needed to confirm these activities.

中文翻译：

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七种精油控制葫芦主要种子传播真菌的抗真菌活性和化学成分

精油代表了合成杀真菌剂控制种子传播病原体的新型替代品。这项研究调查了七种精油，用于体外抑制葫芦科的主要种子传播的病原体。Cymbopogon citratus精油分别以0.6 mg / mL和0.9 mg / mL的浓度完全抑制葫芦丝和链格孢的菌丝体生长。在1 mg / mL的条件下，齿叶薰衣草，杂交薰衣草，互花白千层，月桂叶和两种牛至牛至精油均能抑制链霉菌的菌丝体生长。分别减少了54％，71％，68％，36％，90％和74％。南瓜葡萄球菌的菌丝体生长对薰衣草精油更为敏感，在1 mg / mL时抑制率约为74％。为了确定这些精油中可能引起这种抗真菌活性的主要化合物，通过气相色谱-质谱法（GC-MS）对它们进行了分析。C. citratus精油表明cirtal作为其主要成分，而L.齿叶和L.甘菊精油显示桉叶油素。的M. alternifolia和两个O.马约拉纳精油有萜品烯-4-醇为主要成分，同时为L.矮牵牛精油，这是芳樟醇。因此，在体外，这些精油可以抑制葫芦科的主要种子传播真菌，现在需要进一步的体内研究来确认这些活性。