【摘要】 [目的]研究紫色甘薯块根适宜的60Co-γ射线辐射剂量。[方法]以徐紫L-7和越南紫两个紫色甘薯品种块根为材料,用不同剂量60Co-γ射线(0、25、50、75、100、125和150Gy)辐射甘薯块根,调查块根的出苗率、出苗数和单苗鲜重。[结果]不同剂量辐照处理均推迟了两品种块根的出苗期,降低了两品种块根的出苗率、单个块根出苗数和单苗鲜重,品种间、辐照剂量间差异均达到显著水平。25Gy以上辐照导致两品种块根出苗期与对照相比分别推迟了2、3、5、6和12d。[结论]徐紫L-7半致死剂量(LD50)为66.73Gy,越南紫半致死剂量(LD50)为74.96Gy。更多还原

【Abstract】 [Objective] This study aimed to investigate the appropriate dose of 60Co-γ irradiation for tubers of purple sweet potato.[Methods] The tubers of two purple sweet potato varieties Xuzi L-7 and Yuenanzi were used as experimental materials,and treated with 60Co-γ irradiation at different doses(0,25,50,75,100,125 and 150 Gy) to determine the emergence rate,number of emerged seedlings per tuber and fresh weight per seedling.[Results] After the 60Co-γ irradiation at different doses,the emergence period of tubers was postponed while the emergence rate,number of emerged seedlings per tuber and fresh weight per plant were decreased,and the differences between different varieties and different irradiation doses reached significance level.Compared with the control,the emergence period of tubers at irradiation doses above 25 Gy were postponed by 2,3,5,6 and 12 d,respectively.[Conclusion] The half lethal dose(LD50) of Xuzi L-7 was 66.73 Gy,and that of Yuenanzi was 74.96 Gy.更多还原