Compatibility of Interspecific Cross in Dendranthema Genus

The interspecific cross was attempted between different species/cultivars of different ploidy in Dendranthema genus.The compatible index was calculated in different interspecific crosses.In addition,pollen adhesion,pollen germination,pollen tube growth,fertilization and ovary development were observed under fluoroscope.The results showed that seed-set was easily obtained from interspecific cross between the species of same ploidy or those between the tetraploid and hexaploid.However,few seed-set was obtained from the interpecific cross between diploid and tetrapoliod or hexaploid species,incompatibility was observed.The incompatibility of interspecific cross was characterized by low pollen adhesion,low pollen germination rate,abnormal pollen tube hampered extension on the stigma,calloses deposit on the stigma and collapsed ovary.