Search for proper dose of ~(60)Co-γ ray in Actinidia chinensis radiation breeding

In this experiment red flesh Actinidia chinensis ‘ HongYang ’, yellow flesh A.chinensis ‘ GuiHai No. 4 ’ and green flesh A.chinensis ‘ ChangGuo ’ branches were treated with 60 Coγray in dose of 25Gy , 50Gy , 100 Gy and 150Gy respectively and cutivated in randomized blocks design after treatment.The untreated branches used as control.Surivial rate and height of plant were examined.The result indicated that it was obviously that the inhibition of both the survival rate and the height of plant would be enhanced with increase of the radi- ation dose ranged in this experiment.Different varieties of A.chinensis quite different sensitivity to radiation. The medial lethal dose of 60 Co-γradiation for these three varieties of A.chinensis branches were 50.6Gy ( Hong Yang )、 64.4Gy ( GuiHai NO.4 )、 71.7Gy ( Chang Guo ) .The results would provide an important experimental basis for the radiation breeding of other varieties of A.chinensis.