2. Solutions to Cross incompatiblity (1) Chromosome doubling of the parents (2)Appropriate combination of the parents (3)Intermediator plant (4)Special methods for pollination Mixed pollens Repeated pollination Advanced or delayed pollination Irradiation treatment of pollens2. Solutions to Cross incompatiblity (1) Chromosome doubling of the parents (2) Appropriate combination of the parents (3) Internediator plant (4) Special methods for pollination: Mixed pollens Repeated pollination Advanced or delayed pollination Irradiation treatment of pollens