Palynological study of the pollen grain of i>Vitis vinifera L. cultivars. Some aspects of sculpturing and pollination

Scanning electron microscope analysis of pollen grains of 21 clones from 8 cultivars of Vitis vinifera L. has revealed no marked differences between them, except for some cultivars with heteropolar grains, and cultivars Jaen from Toledo and Tinto Fino from Madrid, which were small. Some details of pollen grain ornamentation and pollination are discussed