Antimicrobial activity of the essential oils of Thymus vulgaris and Origanum vulgare on phytopatogenic strains isolated from soybean

OLIVA. MARIA DE LAS MERCEDES; CAREZZANO MARIA E,; GIULIANO, MILENA; DAGHERO, JORGE; ZYGADLO, J; BOGINO, P; GIORDANO, WALTER; DEMO, M

PLANT BIOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2015 p. 1 - 8

1435-8603

Pseudomonas syringae pv. glycinea is responsible for bacterial common blight of soybean (Glycine max (L.) Merr.); one of the most important crops of Argentina. Its control is a considerable problem due to the limited availability of antimicrobial substances without side effects. In the last years, studies to ascertain the growth inhibition of phytopathogenic bacteria by plant extracts have been intensified and the results strongly suggested the potential use of essential oils for the control of plant bacterial diseases. The aim of this work was to study the antimicrobial activity of essential oils obtained from Thymus vulgaris (thymus) and Origanum vulgare (origanum) on phytopatogenic Pseudomonas isolated from soybean. Strains with characteristics of P. syringae were isolated from leaves of soybean plants with blight symptoms. Ten of these could be identified in Group Ia of LOPAT as P. syringae. Six of them were confirmed as P. syringae by 16S rRNA, indicating the presence of these phytopathogenic bacteria in the east and central regions of Argentina. O. vulgare and T. vulgaris essential oils inhibited all P. syringae strains with better inhibitory activity than the antibiotic streptomicyne. Natural products obtained from aromatic plants represent potential sources of molecules with biological activities.