KẾT QUẢ TẠO GIỐNG CAM SÀNH KHÔNG HẠT BẰNG XỬ LÝ CHIẾU XẠ TIA GAMMA TRÊN MẦM NGỦ

Budwoods from free-disease king mandarin trees were treated by gamma rays at Dalat Nuclear Research Institute in dosage levels as 0, 3, 5, 7, 9 krad. The irradiated buds were grafted on Volkameriana rootstocks in the net house. At 4-5 months after grafting, the grafted trees were transplanted to field for observation and evaluation. Results showed that survival ratio of irradiated budwoods with 3 krad and 5 krad in dosage were 81.8% and 54,5%, and no king mandarin budwoods receiving more than 5 krad survived to growing field. LD50 of treated king mandarin budwoods was near with 5 krad in dosage. Number of seeds per fruit and fruit quality were analysed, commercial seedless individuals were primarily selected for trials. Seven mutant king mandarin individuals were chosen for trials. After 3 years of trials, one individual of them was selected with the name “seedless king mandarin LĐ6”. Fruits of LĐ6 has 0-2 seeds per fruit, average weight: 200-237g, green peel and less rough, juice is orange colour and juicy, sweet and light sour in taste.