Abstract: In order to study the physiologic changes of Camellia drupifera seedlings after ⁶⁰Co-γ irradiation, the authors did a ⁶⁰Co-γ by 0 Gy, 40 Gy, 50 Gy, 60 Gy and 70 Gy irradiation of seeds from two excellent materials C. drupifera ‘Fanlong 3’ and ‘Fanlong 5’ and measured chlorophyll content, soluble sugar content, soluble protein content, peroxidase (POD), superoxide dismutase (SOD) in leaves. The result showed that the influence on physiologic index of C. drupifera of ⁶⁰Co-γ irradiation by various kinds dose was different. The chlorophyll content of 50 Gy group of ‘Fanlong 3’ and ‘Fanlong 5’ were significantly lower than those of other groups (P<0.05). The change tends of soluble sugar content on ‘Fanlong 3’ and ‘Fanlong 5’ were different which showed that the 60 Gy of ‘Fanlong 3’ was relatively low and the 70 Gy of ‘Fanlong 5’ was relatively low. The change tends of soluble protein content on ‘Fanlong 3’ and ‘Fanlong 5’ were the same which showed that the soluble protein contents of 60 Gy treatment were relatively low. The change tends of antioxidant enzyme activity on ‘Fanlong 3’ and ‘Fanlong 5’ were different. The SOD activity of high dose group (60 Gy, 70 Gy) was relatively low and the POD activity of 40 Gy treatment was relatively high in ‘Fanlong 3’. The SOD activity of control group was relatively low and that of 70 Gy treatment was relatively high in ‘Fanlong 5’. The POD activity of 60 Gy treatment was relatively low and that of 50 Gy treatment was relatively high in ‘Fanlong 5’.

Key words: ⁶⁰Co-γ irradiation, Camellia drupifera, physiologic index

摘要： 为了研究⁶⁰Co-γ辐照对越南油茶Camellia drupifera幼苗生理指标的影响，选取越南油茶璠龙3号C. drupifera ‘Fanlong 3’和璠龙5号C. drupifera ‘Fanlong 5’种子进行不同剂量⁶⁰Co-γ辐照(0 Gy、40 Gy、50 Gy、60 Gy、70 Gy)，并测定播种后幼苗叶片叶绿素含量、可溶性糖含量、可溶性蛋白含量及过氧化物酶(POD)、超氧化物歧化酶(SOD)活性。结果表明，不同剂量⁶⁰Co-γ辐照对越南油茶幼苗各项生理指标的影响结果不一致；璠龙3号与5号均表现为50 Gy剂量组叶绿素含量最低，与其他组呈显著性差异(P<0.05)；两种的可溶性糖含量变化趋势不一致，璠龙3号以60 Gy剂量组最低，璠龙5号以70 Gy剂量组含量最低；两种的可溶性蛋白含量变化趋势一致，均以60 Gy剂量组可溶性蛋白含量最低；两种的抗氧化酶活性变化规律不一致，璠龙3号高剂量组(60 Gy、70 Gy) SOD活性较低，40 Gy剂量组POD活性最低，而璠龙5号SOD活性对照组最低，70 Gy剂量组最高，POD活性则以60 Gy剂量组为低，50 Gy剂量组最高。

关键词: ⁶⁰Co-γ辐照, 越南油茶, 生理指标