Since ancient times the medicinal plants helped the society's development in order to reach the present resources. The Lamiaceae family is one of the main, containing a large number of species with medicinal potential and Tetradenia riparia is among them. The harvest of T. riparia leaves occurred in the morning at the Universidade Paranaense's medicinal garden, in Umuarama-PR. The extraction of the essential oil (EO) was done by hydrodistillation, the yield was calculated based on the mass of fresh leaves and EO extracted, obtaining 0.4%. Chemical characterization was performed by gas chromatography attached to a mass spectrometer and found 16 components and the major components identified were: Stigmasta-5,22-dien-3-ol (34.80%); Shyobunol (22.50%); α-Terpinene (15.79%) and β-Cembrenediol (11.05%).

br (Alberton O.). AbstractCymbopogon citratus (DC) Stapf (lemongrass) has many industrial applications. Various factors affect the metabolism of this plant. Specifically, its association with arbuscular mycorrhizal fungi (AMF) increases water absorption and nutrient uptake, mainly phosphorous (P). This study aimed to assess the AMF symbiotic effects on nutrient uptake and growth in C. citratus inoculated with the Rhizophagus clarus and Claroideoglomus etunicatum AMF under different levels of P applied to the substrate. The treatments were prepared in a sterile substrate with high (200 mg kg −1 ) and low (20 mg kg −1 ) P levels, with and without AMF inoculation. The experiment was conducted in a greenhouse for six months. A 3 x 2 (3 mycorrhizal x 2 levels of P) factorial experiment in a completely randomized design (eight repetitions) was used in this study. The variables spore density and root AMF colonization, basal soil respiration, microbial biomass carbon, shoot, root and total dry mass, nitrogen (N) and P content in the plant were analyzed. No significant AMF symbiotic effects (p > 0.05) on lemongrass growth were observed for the P levels. P and N content in the shoots, and total P, increased in treatments with AMF and at the high P level, particularly in the inoculation with R. clarus. Spore density, root colonization, and microbial biomass carbon were higher with AMF inoculation. It was observed that AMF inoculation increased the content of P and N in C. citratus, but did not affect plant growth. AMF inoculation can improve soil quality and, combined with a higher P level, can increase P and N uptake by lemongrass plants, modifying the plant metabolism.

A demanda crescente da utilização dos solos exige soluções que permitam incentivar o desenvolvimento socioeconômico sem comprometer a sustentabilidade dos recursos naturais. Desse modo, o objetivo deste estudo foi avaliar os efeitos de diferentes culturas como café, pastagem e manejo integrado de pastagem e eucalipto na qualidade química e microbiológica do solo. Foram analisados da parte química o pH do solo, nitrogênio, carbono orgânico total e fósforo do solo e da parte microbiológica foram analisados a densidade de esporos de fungos micorrizicos arbusculares (FMAs), carbono da biomassa microbiana (CBM), respiração basal do solo e coeficiente metabólico do solo qCO2. O pH do solo variou de 5,38 no manejo de pasto e eucalipto para 4,70 nas áreas cultivadas com pasto. A densidades de esporos de FMAs e o CBM na área de integração de pasto e eucalipto foram aumentados em relação à área cultivada com café, e o qCO2 foi aumentado com o cultivo do café, indicando que o cultivo de café eleva a condição de estresse do solo nas condições avaliadas. Concluindo, portanto, que as diferentes formas de uso e manejo das três áreas estudadas apontaram variações do comportamento de suas propriedades químicas e microbiológicas, entretanto, o manejo que se destacou foi a de eucalipto com a integração de pastagens, sendo mais sustentável.