Investigations on anomalies of ovule development and on pollination in mutated grapevines, cv. Barbera

In order to point out the reasons for reduced fertility in tetraploid and 2n-4n periclinal chimera grapevines, ovule development and pollination shown by these plants were investigated. Anomalies in embryo sac formation and non-fertilization, mainly due to difficulties in pollination, were observed and related to fertility.