Preliminary Study on Interspecific Incompatibility between Parthenocissus tricuspidata and P.quinquefolia Primary Report of Studies on Overcoming the Interspecific Incompatibility and Hybrid Abortion between Series A and B in the Section Batatas of Genus Ipomoea Study on Cross-compatibility between Prunus mume and P.davidiana Semi Vitro Culture of Pear Style and Identification of the Genotypes of Pea rSe rf-incompatibility Semi Vitro Culture of Pear Style and Identification of the Genotypes of Pea rSe rf-incompatibility