Millerandage and flower abscission in 'Grillo', 'Frappato' and 'Nero d'Avola' grapevines: some probable causes
Some Sicilian cultivars, in particular vintage, showed a high percentage of flower abscissions and shot berries. In this paper, to understand these phenomena, some aspects of the flower morphology of three Sicilian cultivars (two black: Nero dAvola and Frappato; and one white: Grillo) was studied. The number of stamens, ovule adherence to the ovary wall and pollen germination were evaluated using standard light microscopy. At harvest, seed number was counted on 30 berries per cultivar. The percentage of six stamens was lowest in Frappato and highest in Grillo. The ovule adherence to the ovary wall was highest in Frappato and lowest in Nero dAvola. The percentage of pollen germination and seed number was high in Frappato while low in Grillo. Five or six stamens were found in all cultivars. These results could partially explain the different bunch density in Nero dAvola, Grillo and Frappato.
Barbagallo, M.G., Domina, G., Scafidi, F. and Pisciotta, A. (2018). Millerandage and flower abscission in 'Grillo', 'Frappato' and 'Nero d'Avola' grapevines: some probable causes. Acta Hortic. 1229, 195-200
pollen germination, stamen, ovule, coulure, shot berry