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Structural analysis of Castanea sativa Mill. leaves from different regions in the tree top BABT
Pinto,Teresa Maria; Anjos,Maria do Rosário; Martins,Nuno Miguel; Gomes-Laranjo,José; Ferreira-Cardoso,Jorge; Peixoto,Francisco.
The aim of this work was to perform the histological characterization of the C. sativa leaves of three Portuguese cultivars to establish comparison among the leaves of the different quadrants in accord and with the cardinal points of the tree top and among different cultivars of this species, using light microscopy (OM) and scanning electron microscopy (SEM). Measurements were also carried out for the leaf tissue thickness, stomatal density, leaf area in the four tree top quadrants. The leaves turned to the North had lesser thickness of mesophyll mainly due to lower amount of palisade parenchyma. The stomatal density was significantly lower in these leaves, unlike the leaf area that has the highest expression.
Tipo: Info:eu-repo/semantics/article Palavras-chave: C. sativa; Leaf anatomy; Palisade parenchyma; Spongy parenchyma; Stomatal density; Scanning electron microscopy.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000100016
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Study of the effect of Aliette on the activity of spinach (Spinacea oleracea L.) chloroplasts Braz. J. Plant Physiol.
Almeida,Pedro; Coutinho,João P.; Rocha,João; Gomes-Laranjo,José.
Intensification of production in modern agriculture is frequently obtained thanks to the increase of pesticide applications and chemical fertilizers. However, the use of these products sometimes causes a reduction of crop productivity. We aimed to evaluate the impact of the fungicide Aliette on in vitro activity of chloroplasts of spinach (Spinacea oleracea L.). Transmembrane potential formation, PSII oxygen evolution and PSII photochemistry were analyzed. Our results showed that the recommended concentration (2.5 g L-1) of Aliette did not impair the photosynthetic apparatus. However, at higher concentrations (> 7.5 g L-1), reductions in thylakoid membrane potential and oxygen evolution were recorded, but with no evidence of photoinhibition.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioenergetics; Ecotoxicology; Pesticides; Photosynthesis; Xenobiotics.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000100009
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