2. Solutions to the death and sterility of Distant Hybrids (Embryo Culture (2) Chromosome Doubling 3)Backcross: to the cultivated parent (4) Better careful cultivation (5)Elongation of growing period (6) Grafting2. Solutions to the death and Sterility of Distant Hybrids (1)Embryo Culture (2) Chromosome Doubling (3) Backcross: to the cultivated parent (4) Better careful cultivation (5) Elongation of growing period (6) Grafting