Crescimento, produção de fitomassa e teor de óleo essencial de melissa (Melissa officinalis L.) sob diferentes níveis de sombreamento

Abstract

INTRODUÇÃOA melissa (Melissa officinalis L.), conhecida como erva-cidreira verdadeira pertence à família Lamiaceae, é de origem asiática e europeia e foi Recebido para publicação em 22/10/2010 Aceito para publicação em 17/08/2011 Palavras-chave: planta medicinal, metabólito secundário, produção, intensidade luminosaABSTRACT: Growth, biomass production and essential oil content of lemon balm (Melissa officinalis L.) under different shading levels. The aim of this study was to evaluate the variation in essential oil content, growth and biomass production of Melissa officinalis L. cultivated under different shading levels. Experimental design was completely randomized (CRD) with four levels of photosynthetically active radiation (PAR), full light (control) and progressive shading with shade net (shading of 75, 50 and 25%) and six replicates. The following parameters were assessed: stem diameter, plant height, fresh mass and dry mass of shoot, essential oil content, essential oil yield and leaf area. Data were subjected to analysis of variance and regression analysis at 1 and 5% error probability. The characteristics stem diameter and plant height did not show significant differences among treatments. Production of fresh weight, dry mass and essential oil content was similar among all treatments, except for full light, where (FW): 25%=50%, 91.33 g and 68.66 g; (DW): 25%=0%=50%, 11.35, 11.66, 10.66 g and 4.33 g and OC: 25%=50%, 0.48 and 0.40% respectively. The treatment that resulted in the lowest productivity was 75% shading. Thus, in the north of Minas Gerais State, Brazil, from February to June, lemon balm can be cultivated under conditions of up to 50% shading, favoring the production of dry mass, fresh mass and essential oil content; these variables are of commercial interest for producers of medicinal and aromatic plants.Key words: medicinal plant, secondary metabolite, production, light intensity introduzida no Brasil há mais de um século, sendo atualmente cultivada em todo o país. Toda a planta exala odor semelhante ao do limão, que se torna maisRev.

Changes in growth, oxidative metabolism and essential oil composition of lemon balm (Melissa officinalis L.) subjected to salt stress

“…Studies on different types of stress and on growth and development, metabolism, and composition of the essential oils of medicinal plants have gained high momentum. It has been reported that each type of stress differently influences plant metabolism and essential oil composition (Alvarenga et al, 2011;Meira et al, 2012;Kasrati et al, 2014). However, few studies have demonstrated the effect of salt stress on development, metabolism, and composition of essential oils of M. officinalis, in addition to physiological and biochemical responses (Ozturk et al, 2004;Khalid and Cail, 2011).…”

Photosynthetic behavior, growth and essential oil production of Melissa officinalis L. cultivated under colored shade nets

“…Increasing LA is a common strategy used by plants under lower levels of irradiance, as those produced by the blue net (lowest PPFD values, Table 2), to maximize the available area for capturing light energy. In addition, the increase of the photosynthetic surface can compensate the low photosynthesis rate per unit of LA, which is a characteristic of shade leaves (Souza et al, 2011;Meira et al, 2012).…”

Biomass and morphological parameters of lemon verbena (Aloysia triphylla) under different shading levels during different seasonal conditions

“…Martins et al (2008), studying Melissa officinalis, observed that plants grown in full sun had lower leaf area indices when compared to those cultivated in the shade. Meira et al (2012), working with Melissa officinalis, observed an increase in leaf area under 25% shading. It is interesting to note that often the increase in leaf area does not imply an increase in DLM, which was observed in this study.…”