Flavonoid index and dry matter yield and essential oil of Sphagneticola trilobata (l.) Pruski according to the nitrogen dose and soil type
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2017-01-01
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The species Sphagneticola trilobata (L) Pruski, a medicinal plant belonging to the Asteraceae family, native to Brazil, is popularly known as pseudo-arnica, margaridão, picão-da-praia or vedelia. Scientific studies have verified the contraceptive, anti-inflammatory, hypoglycemic, antifungal and antibacterial activity against Xanthomonas pelargonii known as bacterial blight, mainly due to the presence of flavonoids. There are reports of larvicidal action against Aedes aegypti that transmits dengue and yellow fever. Yield and essential oil content of flavonoids in plants correlate with stress factors such as low nitrogen availability. The present work aimed to study the influence of nitrogen fertilization on two soil types in which the content of flavonoids and essential oil yield were evaluated. The experimental design was completely randomized 2x5 factorial design, with two soil types, Red-Yellow Latosol and Cambisol, and five N rates (0, 50, 100, 150 and 200), with eight replications. Experimental unit consisted of a vessel containing four stakes with 30 cm of Sphagneticola trilobata. The experiment was conducted in a greenhouse, with the application of nitrogen doses. We concluded that the most appropriate dose of N for the production of dry matter of S. trilobata was 145 mg dm-3 for Cambisol and 136 mg dm-3 for the Red-Yellow Latosol. The absence of N promoted the highest rate of flavonoids in both soils. The most appropriate dose of N to the highest oil yield was 108 mg dm-3 for Cambisol.
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Revista Brasileira de Plantas Medicinais, v. 19, n. 1, p. 81-89, 2017.
