Actividades enzimáticas antioxidativas em Cistus ladanifer L. provenientes de á...

• Author(s): Santos, Erika ; Abreu, Maria Manuela ; Saraiva, Jorge ; Nabais, Cristina
• Date: 2011
• Persistent ID: http://hdl.handle.net/10400.5/5003
• Origin: Repositório da UTL
• Subject(s): Cistus ladanifer; antioxidative enzymes; climatic conditions; non-contaminated soils; trace elements
• Document Type: Article
• Language: Portuguese

Description

The aim of this study was to evaluate the antioxidant enzymes activity (catalase, per-oxidase and superoxide dismutase) and the concentrations of As, Cu, Pb and Zn in leaves from two populations of Cistus ladanifer growing on soils non-contaminated with trace elements (Caldeirão and Pomarão), but with different climatic conditions and in two different seasons (spring and summer). In both areas, total and available concentra-tions (DTPA extraction) of trace elements in soils were low. The distribution of elements for young and mature leaves was similar be-tween areas and seasons. The enzyme activi-ties varied with the plant population. Leaves collected in the two seasons, except young leaves from Pomarão collected in summer, showed enzymatic activity in the soluble and ionic fractions. Comparing the seasons and sampling areas, C. ladanifer enzymatic ac-tivities represent a tolerance mechanism to different stress factors (UV radiation, high air temperature in summer, drought, low-medium fertility in soils, trace element con-centrations in soil), giving it a high plasticity