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Leaf anatomy of varieties of Vitis vinifera from DO León (Spain) and its relationship to the susceptibility to Plasmopara viticola
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Abstract
- [EN] The microscopic morphology of the leaves of six varieties of Vitis vinifera taken in the León Denomination of Origin is studied: the varieties Albarín Blanco, Malvasía, Mencía, Prieto Picudo, Tempranillo and Verdejo Blanco. The morphology is studied in two leaf fragments (basal and distal) related to the midvein, and parameters such as the thickness of the mesophyll and the stomatal density are measured. There are no works on the microscopic characteristics of the Prieto Picudo variety. All the varieties have the structural characteristics typical of V. vinifera varieties used for commercial purposes. The leaf blades are dorsiventral and hypostomatic with anomocytic stomata. There are two types of trichomes in the abaxial epidermis: some prostrate with a woolly appearance and others upright on which the previous trichomes rest. There are no significant differences between the values for the basal and distal samples of the leaf blade. The Prieto Picudo variety has the thinnest leaf blade and with the lowest stomatal density. It is assumed that the thicker the spongy parennchyma – which implies more intercellular spaces – and the higher the stomatal density, the greater the vulnerability of these varieties to infection by Plasmopara viticola. There are no scientific studies on this subject in the DO León, and very few with the Prieto Picudo variety. One of these studies reports the Prieto Picudo variety as being highly susceptible to the fungus, in which case the starting hypothesis could be rejected and the opposite hypothesis proposed: the thinner the spongy parenchyma and the lower the stomatal density (which are the peculiarities of the Prieto Picudo variety), the greater the vulnerability to P. viticola. However, there are inconsistencies in the works on mildew in the bibliography, possibly because not all the possible variables involved on vulnerability to the fungus are considered
Details
- Database :
- OAIster
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1428016164
- Document Type :
- Electronic Resource