材料期刊网

利用辐射能量为80 MeV/u的12C6＋重离子束辐照番茄种子,辐照剂量分别为30,60,90,120和160 Gy研究其对番茄M1代的生物学效应。结果表明,随着辐照剂量的增大,番茄的发芽率和成苗率降低,且成苗率明显低于发芽率,发现辐照损伤主要抑制了根的生长;MDA和脯氨酸含量变化的总体趋势为随着辐照剂量的增大先升后降再升高,说明高剂量C离子辐照对生物膜造成更严重的损伤;APX活性随着辐照剂量的增大呈先升后降再升高的趋势,表明APX在清除活性氧中起主要作用;POD和SOD活性的总体趋势是随着辐照剂量的增大而降低,且明显低于对照组。综合分析表明,12C6＋重离子束辐照番茄种子,对M1代具有明显的损伤效应,高剂量辐照对番茄种子造成的损伤更大,使酶的活性降低,抑制植株生长。

To investigate the M1 biological effects of heavy ions irradiation on Lycopersicon esculentum Mill.,its seeds were irradiated by 12C6＋ heavy ions（80 MeV/u） with the dosages of 30,60,90,120 and 160 Gy respectively.The results showed that with doses increased gradually,germination rate and seedling rate of Lycopersicon esculentum Mill.were decreased,and the latter was lower than the former,mainly due to the inhibition of root growth.The irradiation increased the content of MDA and proline evidently,showing irradiation could damage biomembrane,and also decreased the activities of POD and SOD with distinct inhibition pattern.However,the low dose and high dose irradiation promoted APX activity,illustrating APX was induced to protect irradiation injury.In brief,exposure to 12C6＋ heavy ions had obvious injury effects on the seeds of Lycopersicon esculentum Mill..Heavy ions irradiation damaged biomembrane,inhibited activities of enzymes,and finally inhibited the growth of the first generation of these seeds.