Inter-specific hybridization in grapes (Vitis species)

Inter-specific hybridizations in grapes involving six V. vinifera cultivars and nine Vitis species revealed highest pollen viability in tiliefolia (93 per cent) and maximum berry set in vinifera x champini. Berry drop was more in vinifera x labrusca. Seeds per berry were highestin vinifera x candicans. Relatively higher percentage of floater seeds was noted in combination of parviflora and tiliefolia. In combinations involving candicans and arizonica, seed germination and survival of hybrids were maximum. Both the species are known for resistance to mildews and anthracnose hence useful in developing promising hybrids. Maternal parents appeared to be mainly involved in seed formation, whereas pollen parent affected the seed viability. Extra chromosome of rotundifolia seemed to be devoid of genes responsible for the berry and seed characters.