Desenvolvimento da espinheira-santa sob diferentes intensidades luminosas e níveis de poda

Abstract

Development of holy-thorn under different light intensities and pruning levelsM. ilicifolia has antiulcerogenic and antigastric properties and a large pharmacological and cosmetic use not yet explored in a rational way. The development of plants submitted to various light and pruning managements was evaluated during a year. Two experiments were carried out, one in a shaded area under native species and another in a full sun light area. The experiment was conducted in a completely randomized design with six replicates and 2 plants in each experimental unit. Three pruning levels were used, plants without elimination of leaves/prune; plants with elimination of 30% of the leaves and branches; plants pruned at 20 cm above the soil. The treatments were evaluated during four periods (0; 100; 211; 331 days after pruning (DAP)). In the full sunshine area, plants submitted to the drastic prune did not develop leaves until 331 DAP. Under this light intensity the number of leaves per branch was different for each pruning level (varying from 11.2 to 15.7 without prune; and from 8.7 to 11.7 with 30% of prune), but kept constant during all evaluation periods. In the area under shade, plants submitted to drastic prune showed higher number of leaves per brunch (25.0 and 29.8 with 100 and 211 DAP, respectively) and the higher leaf area (18.0; 13.9 and 15.5 cm 2 with 100, 211 and 331 DAP). The shading proved to be a better condition for the development of plants and for biomass production than the full sunlight condition. This is a very important factor to be considered to establish the growth and to define the management strategies to produce holy thorn plants. The maximum daily temperatures were reduced until 2.9ºC in the shaded area in comparison to the full sunlight area. The relative air humidity varied between 63,3 and 79,4% under both conditions.

Análise de Horário de Colheitas e Partes da Planta para Extração de Óleo Essencial de Manjericão

“…O fato do menor teor de óleo essencial para todas as partes da planta ser obtido às 15h00 pode estar relacionado à maior temperatura do ar neste horário (Tabela 2). De acordo com Souza et al (2008) e Morais (2009), os óleos essenciais na maioria das vezes apresentam um aumento em seu teor quando as plantas produtoras se encontram em ambientes com temperatura elevada; porém, em dias muito quentes, pode-se observar perda excessiva dos mesmos. Miranda et al (2013) verificaram que a colheita das folhas de capim santo deve ser evitada no horário do meio-dia (12h00), pois proporcionou o menor teor de óleo essencial, podendo causar a volatilização do composto.…”

Seasonal variability of the antimicrobial activity of the essential oil of Lippia alba

“…As temperature and luminosity play important roles in photosynthesis, they influence the vegetative physiological process and, as a consequence, interfere with the content and composition of the EOs in the producing plants (SOUZA et al, 2008). Research evaluating the effect of seasonality associated with the time of harvesting on the production of biomass in L. alba, highlighted that the highest yields were obtained from collections made in the spring and summer, with the lowest obtained from that made in the winter (CASTRO, 2001).…”

“…However, the production of EOs in plants is not stable, nor homogeneously distributed. Many conditions influence their content and composition, such as temperature, luminosity, rain, wind and soil, in addition to such technical factors as the type of crop, cultivation, methods of propagation and post-harvest management (CASTRO, 2001;MORAIS, 2009;SOUZA et al, 2008).…”

Basalt rock dust incorporated to substrate favors Monteverdia ilicifolia seedlings initial growth

“…For adult plants of M. ilicifolia, shading condition affects biomass production, specific leaf area, leaf nutrient concentrations and polyphenols contents (Radomski et al, 2004;Radomski & Bull, 2010;Rocha et al, 2014;Borges et al, 2019); thus, shading seems to be an important factor for the species. Despite being classified as a late secondary species, tolerant to shade in the juvenile stage (Souza et al, 2008), there is little information on the effect of shading on young plants, especially for seedlings production.…”