GerminaÃÃo de sementes, crescimento da planta e composiÃÃo quÃmica do Ãleo essencial de Hyptis marrubioides Epl., Lamiaceae / Seeds germination, plant growth and chemical composition of essential oil of Hyptis marrubioides Epl. Lamiaceae

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Four experiments had been carried out. The first was in order to evaluated different physiological stade of harvesting, temperature and times of storage in the germination of H. marrubioides seeds. The second aimed evaluate the influence of the light in the growth and chemical composition of the essential oil of Hyptis marrubioides. The third, was in order to evaluate sources and doses of fertilization in the growth and chemical composition of the essential oil. The last one evaluate the chemical variability of the essential oil of âhortelÃ-do-campoâ. In the experiment of seeds, it was verified that lightness did not have influence on germination. On the other hand, the temperature of 20 ÂC retarded germination, although it did not have affected the percentage of germination. The storage and different stages of harvesting influenced the GVI (germination velocity index) and percentage of germination. Seeds colleted in a more mature stage demonstrated to be more appropriated to storage for up to 18 months. Was evidenced that in full sun the plants had presented minor height, comparative to the treatments shadings. The relation stems /leaf was bigger in lesser level of irradiance. The number of branches and the accumulation of biomass had been bigger in the highest level of irradiance. The essential oil text demonstrated to be insensitive the irradiance. In relation to the essential oil income, this was maximized in 100% of irradiance. The chemical composition of the essential oil of H. marrubioides demonstrated to be insensitive to the irradiance level, except for iso-3-tujanol and -cadineno. In the fertilization experiment was verified that to obtain a higher yield of the essential oil, the soil used in cultivation did not need the limestone application, and the organic fertilization was superior to the chemical one. With relation to the chemical variability of the oil, the results which allowed three groups of essential oils to be distinguished with respect to sampling site and post-harvested process: cluster I (fresh leaves and fresh or dried stems from Lavras county) with high percentage of caryophylla-4(14),8(15)-dien-5-ol (16.7%) and eudesma-4(15),7-dien-1-ol (12.8%); cluster II (dried leaves and stems from Tiradentes county) with epi-longipinanol (16.2%) rich oil, and cluster III (dried leaves from Lavras) containing a high content of (E)-caryophyllene (17.4%) and -copaene (10.1%).

ASSUNTO(S)

hortelÃ-do-campo hortelÃ-do-campo essential oil luz planta medicinal hyptis marrubioides terpen germinaÃÃo fertilization adubaÃÃo agronomia irradiation hyptis marrubioides terpenos medicinal plant Ãleos essenciais germination

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