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Physiological responses of Zostera marina and Cymodocea nodosa to light-limitat...
Silva, João; Barrote, Isabel; Costa, Monya; Albano, Sílvia; Santos, RuiThe effects of light-limitation stress were investigated in natural stands of the seagrasses Zostera marina and Cymodocea nodosa in Ria Formosa coastal lagoon, southern Portugal. Three levels of light attenuation were imposed for 3 weeks in two adjacent meadows (2–3 m depth), each dominated by one species. The response of photosynthesis to light was determined with oxygen electrodes. Chlorophylls and carotenoid...
The effects of epiphytes on light harvesting and antioxidant responses in the s...
Costa, Monya; Silva, João; Olivé, Irene; Barrote, Isabel; Alexandre, Ana; Albano, Sílvia; Santos, RuiPosidonia oceanica (L.) Delile is a subtidal seagrass whose leaves are commonly colonized by epiphytes. Epiphytes pose physical barriers to light penetration within the leaves, with possible significant impacts on photosynthesis. Furthermore, epiphytes can indirectly be responsible for leaf chlorosis, necrosis and senescence which are known to be related with the increase of oxygen reactive species (ROS) levels...
Responses of zostera marina and cymodocea nodosa to light-limitation stress
Silva, João; Barrote, Isabel; Costa, Monya; Albano, Sílvia; Santos, RuiThe effects of light-limitation stress were investigated in natural stands of the seagrasses Zostera marina and Cymodocea nodosa in Ria Formosa coastal lagoon, southern Portugal. Three levels of light attenuation were imposed for 3 weeks in two adjacent meadows (2–3 m depth), each dominated by one species. The response of photosynthesis to light was determined with oxygen electrodes. Chlorophylls and carotenoid...
Antioxidant, Anti-5-lipoxygenase and Antiacetylcholinesterase Activities of Ess...
Albano, Sílvia; Lima, A. S.; Miguel, Maria Graça; Pedro, L. G.; Barroso, J. G.; Figueiredo, A. C.The scavenging of free radicals and superoxide anion, the inhibition of 5-lipoxygenase and the antiacetylcholinesterase activities of essential oils and decoction waters of eight aromatic plants (Dittrichia viscosa, Foeniculum vulgare, Origanum vulgare, Salvia officinalis, Thymbra capitata, Thymus camphoratus, Thymus carnosus and Thymus mastichina) were studied. The essential oils were dominated by 1,8-cineole ...
Biological activities of extracts of plants grown in Portugal
Albano, Sílvia; Miguel, Maria GraçaThe antioxidant properties of herbs and spices are important in the prevention of several diseases. Extracts from Foeniculum vulgare (Apiaceae), Dittrichia viscosa (Asteraceae), Origanum vulgare, Salvia officinalis, Thymbra capitata, Thymus camphoratus, Thymus carnosus and Thymus mastichina (Lamiaceae) were investigated for their antioxidant and anti-inflammatory activities. Some extracts were studied for the f...
Effects of in situ shading on the photophysiology of Zostera marina and Cymodoc...
Silva, João; Barrote, Isabel; Albano, Sílvia; Costa, Monya; Neves, Pedro; Graça, Gonçalo Nuno Santos Neto da; Sharon, Yoni; Beer, S.; Santos, RuiThe effects of light reduction were investigated in natural stands of the seagrasses Zostera marina and Cymodocea nodosa in Ria Formosa coastal lagoon, southern Portugal. Four shading plots and a control were set in each of two neighbouring meadows (2-3 m depth), each dominated by one species. The experiment lasted for 3 weeks, at the end of which the response of plant photosynthesis to light was determined via...
Pollination effectiveness of different strawberry floral visitors in Ribatejo, ...
Albano, Sílvia; Salvado, Eva; Duarte, Sónia; Mexia, António; Borges, Paulo A. V.This study was carried out in a strawberry (Fragaria × ananassa Duch.) field located in Ribatejo, Portugal, and aims to describe the qualitative component of the visits for three strawberry floral visitors, attaining the best results in a previous work. The main objectives were: (1) to assess the pollination rate (PR) resulting from a single visit of Apis mellifera L., Syrphidae and native bees, and (2) to char...
Floral visitors, their frequency, activity rate and Index of Visitation Rate in...
Albano, Sílvia; Salvado, Eva; Borges, Paulo A. V.; Mexia, AntónioThis study was carried out in one of the most important strawberry (Fragaria × ananassa Duch.) producing regions of Portugal, the Ribatejo, and aims to describe the quantitative component of visits by strawberry floral visitors under open field conditions. The main objectives were: (1) to assess the flower-visiting insects of the strawberry crop; (2) to evaluate the percentage of frequency (F) and activity rate...
Avaliação preliminar do efeito da polinização por abelhões na qualidade da prod...
Salvado, Eva; Albano, Sílvia; Borges, Paulo A. V.; Mexia, AntónioNeste trabalho apresentam-se os resultados relativos a um estudo da produção de tomate na época de Primavera-Verão, desenvolvido numa estufa na região Oeste de Portugal com o objectivo de avaliar a eficácia dos abelhões, comparando-a com outra técnica de polinização, a vibração mecânica das flores. Para o efeito foi analisada a produção de 3 modalidades de plantas (A- plantas com exposição à actividade dos abel...
Análise comparativa da importância dos vários agentes de polinização na cultura...
Albano, Sílvia; Salvado, Eva; Borges, Paulo A. V.; Mexia, AntónioA maioria das cultivares modernas de morangueiro possuem flores hermafroditas auto-férteis cuja polinização está dependente da acção combinada de vários agentes, nomeadamente o vento, a gravidade e os insectos polinizadores. A contribuição relativa de cada um destes agentes de polinização é variável consoante as cultivares envolvidas e o ambiente em que está inserida a cultura (estufai ar-livre). Com o objectiv...