Colored shade nets induced changes in growth, anatomy and essential oil of Pogostemon cablin

Abstract

The purpose of this investigation was to determine the influence of colored shade nets on the growth, anatomy and essential oil content, yield and chemical composition of Pogostemon cablin. The plants were cultivated under full sunlight, black, blue and red nets. The harvesting was performed 5 months after planting and it was followed by the analysis of plant growth parameters, leaf anatomy, essential oil content, yield and chemical composition. The plants grown under red net have produced more leaf, shoot, total dry weight and leaf area. Plants cultivated under colored nets showed differences in morphological features. Plants maintained under red net had a higher leaf blade thickness and polar and equatorial diameter of the stomata ratio. Additionally, higher yield of essential oil in the leaves was observed under red and blue colored shade net. The essential oil of the plants grown under red net showed the highest relative percentage of patchoulol (66.84%). Therefore, it is possible using colored shade nets to manipulate P. cablin growth, as well as its essential oil production with several chemical compositions. The analyses of principal components allowed observing that pogostol has negative correlation with α-guaiene and α-bulnesene. There was difference in total dry weight and patchoulol content when the patchouli is cultured under the red colored shade nets.

Impact of phosphorus and luminosity on the propagation, photochemical reactions and quality of Lippia alba (Mill.) N.E.Br. seedlings

“…These authors found that Melissa officinalis L. plants, at 120 d after transplanting, showed a greater SLM when cultivated under full sun. For LAR, Ribeiro et al (2018) found higher values in Pogostemon cablin cultivated under shaded conditions. The increase in SLA under this condition indicated the adaptive ability of leaf tissues in optimizing light capture (Guzmán et al, 2016;Liu et al, 2016) because it promotes CO 2 assimilation and stomatal control (Gommers et al, 2013).…”

Change in leaf anatomy, physiology, and essential oil of Varronia curassavica Jacq. accessions under two light conditions

“…This result reflects an increase in the volume of mesophyll per leaf area, which may favour the structural photosynthetic mechanism. This mechanism increases the diffusion of CO2 in the intercellular space, facilitates the CO2 diffusion by the rubisco enzyme (ribulose 1,5-bisphosphate carboxylase/oxygenase), and regulates light intensity, consequently protecting the photosynthetic apparatus and improving its efficiency (Terashima et al, 2006;Valladares et al, 2012;Ribeiro et al, 2018).…”

Efeito de níveis de irradiância na produção de biomassa, teor de óleo essencial e anatomia de Artemisia alba Turra

“…O conhecimento sobre os requerimentos de luz para espécies medicinais é importante para fatores determinantes da produtividade fotossintética da planta e tem grande influência sobre a estrutura geral e morfologia das folhas, caules e raízes. Como a intensidade luminosa afeta a produção de metabólicos secundários, será maior a possibilidade de prever a composição química e o desenvolvimento de plantações economicamente importantes (Ribeiro et al, 2022;Ribeiro et al, 2018).…”

“…O crescimento e o desenvolvimento de uma planta, podem ser influenciados pela duração e pelo comprimento de onda da luz, mas as diferenças na intensidade da irradiância são responsáveis pelas maiores variações nas formas anatômicas e morfológicas (Olivares-Soto & Bastías, 2018;Ribeiro et al, 2022;Ribeiro et al, 2018). Pesquisas de Ribeiro et al (2022), revelaram que a produção de biomassa em Pogostemon cablin (Blanco) Benth., apresentou efeito significativo sob intensidade luminosa.…”