Mutagenic Effect of ~(60)Co-γ Ray Irradiation on M2 Population of Potato Tubers

LI Pei-hua et al(Sichuan Xichang College,Xichang,Sichuan 615013)

Potato M2 generation;60Co-γ ray;Agronomic characters

[Objective] The aim was to study the mutagenic effects of 60Co-γ ray with different radiation doses on M2 population of potato tubers.[Method] With Yunshu 2 and E potato 5 as tested materials,the dormant tubers of 2 potato varieties were radiated with 60Co-γ ray at four doses(5,10,15,20 GY).Some agronomic characters such as the leaf chlorophyll content,dry matter content,starch content,yield were determined to study the mutagenic effects of 60Co-γ ray with different radiation dose on M2 population of potato.[Result]The variation extent of main agronomic characters of the same potato variety treated with different radiations was different;the variation extent of main agronomic characters of different potato varieties treated with the same radiation dose was different.It was efficient to improve individual traits such as early maturity,disease resistance,high yield,chlorophyll content induced by 60Co-γ ray.The appropriate radiation doses of 60Co-γ ray were 10-20 GY,and 41 excellent lines were selected from M2 population of 2 potato varieties.[Conclusion] Radiation mutation was an effective breeding technique in potato,but most mutations were recessive and the irradiation breeding was difficult.