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Are neighboring trees in tune? Wood formation in Pinus pinaster
Vieira, Joana; Rossi, Sergio; Campelo, Filipe; Nabais, CristinaNeighboring trees growing under identical environmental conditions can exhibit different dynamics and periods of growth. Despite the recent advances in cambial biology, the exogenous and endogenous factors generating asynchronous xylem growths still remain undetermined. This study investigated timings and duration of xylem formation in maritime pine (Pinus pinaster Ait.) from an even-aged plantation in Portugal...
Genetic Diversity and Differentiation of Juniperus thurifera in Spain and Moroc...
Teixeira, Helena; Rodríguez-Echeverría, Susana; Nabais, CristinaJuniperus thurifera L. is an important tree endemic to the western Mediterranean basin that it is able to grow in semi-arid climates. It nowadays exhibits a disjunct distribution pattern, occurring in North Africa, Spain, France and the Italian Alps. The Strait of Gibraltar has acted as an efficient barrier against gene flow between African and European populations, which are considered different subspecies by ...
Actividades enzimáticas antioxidativas em Cistus ladanifer L. provenientes de á...
Santos, Erika; Abreu, Maria Manuela; Saraiva, Jorge; Nabais, CristinaThe 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 availa...
Ecophysiological tolerance of duckweeds exposed to copper
Kanoun-Boulé, Myriam; Vicente, Joaquim A. F.; Nabais, Cristina; Prasad, M. N. V.; Freitas, Helenahttp://www.sciencedirect.com/science/article/B6T4G-4TGXP9V-1/2/0652ab94eb95eab94ea56a82c424997b
Trace elements and activity of antioxidative enzymes in Cistus ladanifer L. gro...
Abreu, Maria Manuela; Santos, Erika S.; Nabais, Cristina; Saraiva, Jorge A.Abstract The Mediterranean shrub Cistus ladanifer grows naturally in Sa˜o Domingos (Portugal), an abandoned copper mine. High levels of trace elements in plants can generate oxidative stress increasing the activity of antioxidant enzymes. The aim of this work was to evaluate and compare As, Cu, Pb and Zn concentrations and the activity of the soluble and cell wall ionically bounded forms of the enzymes catalase...
Belowground mutualists and the invasive ability of Acacia longifolia in coasta...
Rodríguez-Echeverría, Susana; Crisóstomo, João; Nabais, Cristina; Freitas, HelenaThe ability to form symbiotic associations with soil microorganisms and the consequences for plant growth were studied for three woody legumes grown in five different soils of a Portuguese coastal dune system. Seedlings of the invasive Acacia longifolia and the natives Ulex europaeus and Cytisus grandiflorus were planted in the five soil types in which at least one of these species appear in the studied coastal...
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltam...
Santos, Margarida Maria Correia dos; Alves, Sheila; Gonçalves, Maria de Lurdes Simões; Nabais, CristinaHolm oak (Quercus ilex) is the dominant tree growing on serpentine soils of northeast Portugal, characterized by elevated soil concentrations of Ni and Mg, combined with low Ca concentrations. Apparently Q. ilex does not suffer from excessive concentrations of Ni in the soil. In this work we report a complexation study of nickel by the relevant ligands present in xylem sap: histidine, aspartic acid, oxalic and ...
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