RESUMO O estudo teve como objetivo avaliar o enraizamento e alguns caracteres fisiológicos em estacas de Lantana camara L. (Verbenaceae) em diferentes concentrações de ácido indolbutírico (AIB) e sua associa- ção com os fungos micorrízicos arbusculares (FMA) Claroideoglomus etunicatum (W.N. Becker & Gerd.) C. Walker & A. Schüssler e Gigaspora albida N.C. Schenck & G.S. Sm. Utilizou-se o delineamento experimental inteiramente casualizado em esquema fatorial 3 × 3 com três repetições, sendo o primeiro fator composto pelos FMA e o segundo fator pelas doses de AIB (0; 1,0 e 1,5 mg.mL-1). Os resultados mostraram que a presença de FMA no substrato, assim como o AIB, isolados ou de forma interativa estimulam o enraizamento e alguns caracteres fisiológicos de estacas de L. camara.

ABSTRACT The objective of this study was to evaluate the rooting and some physiological characteristics of Lantana camara L. (Verbenaceae) stakes in different concentrations of indolebutyric acid (IBA) and its association with the arbuscular mycorrhizal fungi (AMF) Claroideoglomus etunicatum (W.N. Becker & Gerd.) C. Walker & A. Schüssler e Gigaspora albida N.C. Schenck & G.S. Sm. The experimental design was completely randomized in a 3x3 factorial scheme with three replicates, where the first factor was the AMF and the second factor by doses of IBA (0; 1.0 and 1.5 mg .mL-1). The results showed that the presence of AMF in the substrate, as well as the IBA, isolated or in association stimulates the rooting and some physiological characters of L. camara cuttings.

Alecrim da Chapada (Lippia gracilis Schauer) é considerada uma planta rica em óleo essencial e possui atividade antimicrobiana comprovada, devido aos monoterpenos fenólicos carvacrol e timol. O objetivo deste trabalho foi avaliar o efeito in vitro do óleo essencial e dos extratos etanólicos de raízes e folhas de L. gracilis no controle do fungo Monosporasccus cannonballus, causador do colapso do meloeiro. O extratos foram testados nas concentrações de 2500, 5000 e 7500 ppm e o óleo essencial de L. gracilis foi avaliado nas concentrações 255, 340 e 425 ppm tendo também um controle positivo com o fungicida comercial Captan(r) e um negativo apenas com meio BDA (batata, dextrose, ágar). Discos de micélio com 3 mm de diâmetro foram inoculados no centro de placas de Petri e as medições do crescimento micelial do fungo foram realizadas 48 horas após a montagem do experimento. Verificou-se que o óleo essencial de L. gracilis nas três concentrações testadas foi eficiente para o controle do fungo, com percentuais de inibição de 100%, em comparação ao tratamento com o controle negativo (0%) que não apresentou inibição. O extrato radicular, nas concentrações de 5000 e 7500 ppm e o extrato foliar na concentração de 7500 ppm também proporcionaram um percentual de inibição de 100%.

"Alecrim da Chapada" (Lippia gracilis Schauer) is a plant which is considered to be rich in essential oil and proven to have antimicrobial activity due to the phenolic monoterpenes carvacrol and thymol. The aim of this study was to evaluate the in vitro effect of essential oil and ethanol extracts from roots and leaves of L. gracilis on the control of the fungus Monosporasccus cannonballus, the causal agent of melon collapse. The extracts were tested at the concentrations 2500, 5000 and 7500 ppm and L. gracilis essential oil was evaluated at the concentrations 255, 340 and 425 ppm; there was also a positive control with the commercial fungicide Captan(r) and a negative control only with PDA medium (potato, dextrose, agar). Mycelium discs of 3mm diameter were inoculated in the center of Petri plates and measurements of mycelial growth were performed at 48 hours after the establishment of the experiment. L. gracilis essential oil, at the three tested concentrations, was effective in controlling the fungus, showing inhibition percentages of 100%, compared to the treatment with the negative control (0%), which showed no inhibition. The root extract, at concentrations 5000 ppm and 7500 ppm, and the leaf extract, at a concentration of 7500 ppm, also provided inhibition percentage of 100%.

This study evaluated the effect of salt stress on the growth of Lippia gracilis Schauer, a species native to the caatinga (shrublands) of Brazil and rich in essential oils, as well as on the quality of its oil. We exposed individuals of L. gracilis to NaCl, in the following concentrations, for a period of 40 days: 25 mM; 50 mM; 75 mM; and 100 mM. An additional group of plants was not exposed to NaCl (controls). Data were collected on days 20 and 40. We evaluated relative growth rate; shoot and root dry weight; relative water content; proline concentration in leaves; and chemical composition of the essential oil. At all concentrations, NaCl reduced the relative growth rate in comparison with that observed for the controls. No significant difference in relative water content was observed among treatments. In all treatments, the proline concentration in leaves was highest on day 40. Salt stress did not affect the yield or the concentrations of the constituents of the essential oil of L. gracilis, carvacrol and thymol showing the highest concentrations in all treatments.