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Publicação
Características morfo-anatómicas de cultivares tintas de videira (Vitis vinifera)
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Resumo(s)
The objectives of this work consisted in studying the anatomical leaf-biometric characteristics
of red grapevine cultivars, 'Aragonez', 'Cabernet Sauvignon', 'Syrah' and 'Touriga Nacional',
throughout the season, on field conditions. The studies were conducted using light and
scanning electron microscopy. Epidermal features, such as the thickness of the cuticle, the
stomatal index, the shape and dimensions of epidermal cells in the leaf surface and
distribution of trichomes are similar. The stomata are of two types, the actinocytic type,
already referred to the genus Vitis, and the staurocytic type. The stomata size is very
diverse: large and small stomata coexist side by side. The cvs. 'Cabernet Sauvignon' and
'Touriga Nacional' present spongy parenchyma with less air intercellular spaces, in
opposition to the cvs. 'Aragonez' and 'Syrah. It was also found that, in cross sections, the
lumen of the cells of 'Touriga Nacional' and 'Cabernet Sauvignon' is higher than in the other
cultivars. The main leaf of cv. 'Aragonez' stands out for its higher leaf area and the cv.
'Cabernet Sauvignon' by the lowest. In summary, in the four cultivars leaves were observed
similar anatomical features but with a different organization of the mesophyll and with
different thicknesses of epidermal cells, that might be responsible for the differences found in
the resistance to stress environmental conditions.
Descrição
Mestrado em Engenharia Agronómica - Protecção das Plantas - Instituto Superior de Agronomia
Palavras-chave
vitis vinifera anatomia foliar morfologia foliar cuticula estomas leaf anatomy leaf morphology cuticle stomata