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Lettuce (Lactuca sativa L.) is considered one the most appreciated vegetables in cooking, due to its flavor, nutritional quality, high content vitamins and minerals. However, it has been facing several phytosanitary problems, which have been using alternative treatments from essential oils such as Thymus vulgaris L. in seeds, which is responsible for antimicrobial activity and positively influences the physiological processes plants. Therefore, objective the work was to evaluate the potential use the essential oil of T. vulgaris on the sanitary and physiological quality in seeds of L. sativa. The experiments were carried out at the Seed Laboratory of the Agricultural School of Jundiaí/UFRN/ Macaíba-RN. In order to obtain and extract the essential oil, 200 g of fresh leaves and branches of plants with 2 and 3 years old thyme were collected in the vegetable garden at UFRN, and through the method steam dragging and diluted in the following concentrations: 0, 2, 4, 6, 8 and 10%. Crepe lettuce seeds the curly type were purchased from organic producers in the municipality of ParazinhoRN, then transported to the Seed Laboratory, incubated for 15 minutes in the oil and carried out sanitary evaluation using the Blotter test method at temperature of 25 ± 2 °C, 12 h photoperiod. After 7 days, with the aid of an electron microscope, the fungal genera were identified. The following physiological analyzes were performed: germination (G), first germination count (FGC), the results were expressed as percentage (%) and the germination speed index (GSI). The length of the area (LA) and roots (LR) of the seedlings, results obtained in mm.plant, the dry mass of the aerial part (DMAP) and dry mass of root (DMR) were measured, mg.plant-. The experimental design was completely randomized with five treatments (concentrations of essential oils) and four replications of 50 seeds. The data were submitted to ANAVA by the F test, and when significant, the Scott-Knott test (P ≤ 0.05) was used, the means for physiological quality were compared by the Tukey test (P ≤ 0.05) and statistical analyzes carried out in Program R. The concentration of 8% essential oil of T. vulgaris provided the lowest percentages incidence of Aspergillus sp., Aspergillus niger, Penicillium sp. and Alternaria sp., Fusarium sp. and greater efficiency in the physiological potential in seeds and seedlings of Lactuca sativa.

brazilian journal of development

ÓLEO ESSENCIAL DE TIMMUS VULGARIS: UMA ALTERNATIVA PARA O TRATAMENTO DA SANIDADE E DA QUALIDADE FISIOLÓGICA EM SEMENTES DE LACTUCA SATIVA / ESSENTIAL OIL TIMMUS VULGARIS: AN ALTERNATIVE FOR TREATMENT HEALTH AND PHYSIOLOGICAL QUALITY IN SEEDS LACTUCA SATIVA