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Food Science and Technology International
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Fungitoxic Activity Against Phytopathogenic Fungi and the Chemical Composition of Thymus zygis Essential Oils

R. Pérez-Sánchez

Department of Botany, Ecology and Plan Physiology. University of Cordoba, Rabanales Campus 14071 Cordoba, Spain

F. Infante

Department of Botany, Ecology and Plan Physiology. University of Cordoba, Rabanales Campus 14071 Cordoba, Spain

C. Gálvez

Semillas Silvestres S.L., Aulaga 24, 14012 Cordoba, Spain

J.L. Ubera

Department of Botany, Ecology and Plan Physiology. University of Cordoba, Rabanales Campus 14071 Cordoba, Spain, ubera{at}uco.es

The yield, chemical composition, and antifungal properties of essential oils from six populations of Thymus zygis Loefl. ex L. were studied. Phytopathogenic fungi Pythium irregulare, Rhizoctonia solani, Colletotrichum acutatum, Fusarium oxysporum, and Sclerotinia sclerotiorum showed a clear inhibition in the poisoned food test. Inhibition is tested by EC50. This activity indicator ranges from 86 ppm in the most active oils to 577 ppm. Among the identified components of the oils, 3-octanol and {alpha}-terpinene had the highest correlation with the antifungal activity. Yield, antifungal activity, and plant morphology, led to the selection of the population T. zygis ssp. gracilis harvested at flowering stage as most suitable for potential agronomical use.

Key Words: Thymus zygis • Labiatae essential oils • antifungal activity • 3-octanol • {alpha}-terpinene

Food Science and Technology International, Vol. 13, No. 5, 341-347 (2007)
DOI: 10.1177/1082013207085687
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