The influence of flower morphology on pollination and yield of grapevine (Vitis vinifera L. cv. 'Pikolit')

Abstract

Vitis vinifera L. cv. 'Pikolit' is a white grapevine variety, which production is generally very unstable and very poor. The vine express flower-shedding, which can be explained by several causes: physiological, pathological, genetic, ecological and nutritional. Flower-shedding has been studied at collection vineyard of Dobrovo in Goriška Brda. The variable studied was the impact of a different distance of cv. 'Pikolit' from a plantation of pollination vine cv. 'Rebula' on the quality and quantity of the crop. The grapevines have been devided into four groups; A (grapevines near pollinator), B (control grapevines), C (grapevines with isolation flowers) and pollinator group cv. 'Rebula'. The proximity of the pollination vine showed to be in direct correlation with the quality and quantity of cv. 'Pikolit' crop. The cause for this phenomena is a morfological one as cv. 'Pikolit' has functional female flower, which disable autofertilisation. Furthermore, the pollen itself is not fertile.