Bodor P., Baranyai L., Ladányi M., Bálo B., Strever A.E., Bisztray G.D., Hunter J.J.
Department of 'Viticulture, Institute of Viticulture and Oenology, Corvinus University of Budapest, 29-43 Villányi Street, H-1118 Budapest, Hungary; Department of Physics and Automatization, Faculty of Food Sciences, Corvinus University of Budapest, 14-16 Somlói Street, H-1118 Budapest, Hungary; Department of Mathematics, Faculty of Horticultural Sciences, Corvinus University of Budapest, 29-43 'Villányi Street, H-1118 Budapest, Hungary; Robert Károly College, Research Institute of Viticulture and Enology, Kölyuktetö Pf.: 83, Eger H-3300, Hungary; Department of Viticulture and Oenology, Stellenbosch University, Private Bag Xi, Matieland, 7602, Stellenbosch, South Africa; ARC Infruitec-Nietvoorbij 1, Private Bag X5026, 7599, Stellenbosch, South Africa
Bodor, P., Department of 'Viticulture, Institute of Viticulture and Oenology, Corvinus University of Budapest, 29-43 Villányi Street, H-1118 Budapest, Hungary; Baranyai, L., Department of Physics and Automatization, Faculty of Food Sciences, Corvinus University of Budapest, 14-16 Somlói Street, H-1118 Budapest, Hungary; Ladányi, M., Department of Mathematics, Faculty of Horticultural Sciences, Corvinus University of Budapest, 29-43 'Villányi Street, H-1118 Budapest, Hungary; Bálo, B., Robert Károly College, Research Institute of Viticulture and Enology, Kölyuktetö Pf.: 83, Eger H-3300, Hungary; Strever, A.E., Department of Viticulture and Oenology, Stellenbosch University, Private Bag Xi, Matieland, 7602, Stellenbosch, South Africa; Bisztray, G.D., Department of 'Viticulture, Institute of Viticulture and Oenology, Corvinus University of Budapest, 29-43 Villányi Street, H-1118 Budapest, Hungary; Hunter, J.J., Department of Viticulture and Oenology, Stellenbosch University, Private Bag Xi, Matieland, 7602, Stellenbosch, South Africa, ARC Infruitec-Nietvoorbij 1, Private Bag X5026, 7599, Stellenbosch, South Africa
Historically, grapevine (Vids vinifera L.) leaf characterisation has been a driving force in the identificationof cultivars. In this study, ampelometric (foliometric) analysis was done on leaf samples collected fromhand-pruned, mechanically pruned and minimally pruned 'Sauvignon blanc' and 'Syrah' vines to estimatethe impact of within-vineyard variabifity and a change in bud load on the stabifity of leaf properties.The results showed that within-vineyard variabifity of ampelometric characteristics was high within acultivar, irrespective of bud load. In terms of the O.I.V. coding system, zero to four class differences wereobserved between minimum and maximum values of each characteristic. The value of variabifity of eachcharacteristic was different between the three levels of bud load and the two cultivars. With respect to budload, the number of shoots per vine had a significant effect on the characteristics of the leaf laminae. Singleleaf area and lengths of veins changed significantly for both cultivars, irrespective of treatment, while anglebetween veins proved to be a stable characteristic. A large number of biometric data can be recorded on asingle leaf; the data measured on several leaves, however, are not necessarily unique for a specific cultivar.The leaf characteristics analysed in this study can be divided into two groups according to the response toa change in bud load, i.e. stable (angles between the veins, depths of sinuses) and variable (length of theveins, length of the petiole, single leaf area). The variable characteristics are not recommended to be usedin cultivar identification, unless the pruning method/bud load is known.
