Etnobotânica De Espécies Vegetais Medicinais No Tratamento De Transtornos Do Sistema Gastrointestinal

This study aimed to select the plants used to treat disorders of the gastrointestinal system, in the Rio Urubueua community of Fatima, Abaetetuba, and Pará for their particular context of use, combined with local knowledge. The survey was conducted with 35 informants between the ages of 28 and 93, selected using the snowball method.Data was obtained by participant observation, semi-structured interviews and by non-specific induction. To show the relative importance of plant species, we calculated the percentage of agreement on the main uses (CUP) and agreement with regards to the corrected main uses (cUPC).The interlocutors indicated various therapeutic recipes, and from these, those most used in the treatment of diarrhea were chosen, due to having recurrent cases of this disease in the community. The chemical potential of plants was investigated using scientific documents and databases. "Boldo" and "Anoerá" showed a maximum CUP value (100%), while the "Hortelã" obtained a higher cUPC (87.5%).Of the 79 plant species used in traditional medicine in this community, nine are used by the national healthcare service(SUS). The drugs are prepared only in the form of tea, with the leaves being the most widely used plant parts (65%).For the treatment of diarrhea, the 12 species used by the interlocutors have chemical compositions that are supported by specialized literature.The Rio Urubueua community of Fatima makes use of medicinal plants to cure diseases, from knowledge obtained, in most cases, from their ancestors. This traditional knowledge contributes to the cultural knowledge of the region and to the research and development of new drugs. © 2016, Instituto de Biociencias. All rights reserved.18254755

Photosynthesis, stomatal conductance and leaf water potential in crabwood (Carapa guianensis)

Leaf water potential is one of the most important factors affecting stomatal functioning. The aim of this study was to assess the effect of variation in diurnal irradiance and vapour pressure deficit on photosynthesis (A), stomatal conductance (g s) and leaf water potential (psi) in Carapa guianensis (Aubl.). Data were collected from 07:00 to 17:00 h. Photosynthetic rates reached a maximum (2.5 µmol m-2 s-1) at 10:00 h, thereafter declined to a minimum of 1 µmol m-2 s-1 at 16:00 h. Stomatal conductance oscillated during the day, from 0.04 mol m-2 s-1 (at midday) to 0.02.mol.m-2.s-1 at the end of the afternoon. Leaf water potential was higher early in the morning (-0.3 MPa) and lower (-0.75 MPa) at mid-afternoon (14:30 -15:00 h). After reaching a minimum, psi increased up to -0.64 MPa at sunset. Photosynthetic rates increased linearly as a function of g s (P < 0.01). Also there was a positive relationship between psi and g s (P< 0.01). Photosynthetic rates declined during the day after reaching a peak early in the morning, which makes clear that environmental factors that influence psi greatly affect carbon assimilation of C. guianensis.O potencial hídrico da folha é um dos fatores mais importantes que afetam o funcionamento dos estômatos. O objetivo deste trabalho foi avaliar o efeito da variação diurna na irradiância e déficit de pressão de vapor (DPV) na fotossíntese (A), condutância estomática (g s) e potencial hídrico da folha (psi) em Carapa guianensis (Aubl.). Os dados foram coletados de 07:00 às 17:00 h. A taxa fotossintética atingiu um valor máximo (2,5 µmol m-2 s-1) às 10:00 h, depois declinou até atingir um mínimo de 1 µmolm-2 s-1 às 16:00 h. A condutância estomática oscilou durante o dia, de 0,04 molm-2s-1 (ao meio dia) para 0,02 molm-2s- 1 no final da tarde. O potencial hídrico da folha foi máximo nas primeiras horas do dia (-0,3 MPa) e mínimo (-0,75 MPa) no meio da tarde (14:30 a 15:00 h). Após ter alcançado um mínimo, o psi aumentou até -0,64 MPa no fim da tarde. A taxa fotossintética aumentou linearmente em função do g s (P < 0,01). Também houve uma relação positiva entre psi e g s (P < 0,01). A taxa fotossintética declinou durante o dia após ter alcançado um pico no início da manhã, demonstrando que os fatores ambientais que afetam o psi têm efeito significativo na assimilação do carbono de C. guianensis