Ampelographic analysis in grapevine. The fillometry as a tool of characterization and identification [Vitis vinifera]

anglais. The traditional ampelographical methods, studied by means of computer analysis, can provide a list of characters with a good discriminanting power. The main purpose of this study was to identify the ampelometrical features that can make procedures easier and results more effective. In fact, the criterion that showed to be the most effective in order to characterize and to identify some grapevine cases was named shape factor. To verify the discriminanting power of shape factor, it was tested on three cases: (a) the first study was about the ampelometrical measurements of some rootstocks subjected to different water regim; (b) the second work was about some Pinot noir clones; (c) the last study was about the characterization of 34 grapevine varieties. The shape factor showed itself very efficient about the purpose of this study and the obtained results were according to the literature

italien. Nel presente lavoro e' stata verificata l'applicabilita' di una nuova formula fillometrica denominata coefficiente forma che coniuga in una unica espressione tutte le componenti strutturali della foglia di vite. Per valutarne la validita' si sono considerati aspetti sperimentali differenti: (a) sono state testate le variabili utilizzate in letteratura e quella proposta dagli stessi AA su alcuni ibridi portinnesti, attraverso uno studio sull'effetto dell'influenza idrica sulle caratteristiche fogliari; (b) e' stata validata la variabile fillometrica per il riconoscimento delle differenze clonali nella cultivar Pinot nero; (c) e' stata applicata la variabile fillometrica proposta a 34 varieta' di diversa origine. Le osservazioni effettuate portano a concludere che il coefficiente forma proposto puo', per la sua semplicita' applicativa e per le informazioni che assomma, fornire una buona base di indagine per la caratterizzazione della espressione fogliare