60Co-γ射线辐照处理对4种药用植物种子萌发的影响

用不同剂量60Co-γ射线对益母草、蒲公英、车前、紫苏种子进行辐照处理,测定这4种药用植物种子的发芽率、发芽势、发芽指数等指标,了解60Co-γ射线辐照对其种子萌发的影响,为这4种药用植物的新品种选育提供参考。结果表明,60Co-γ射线对4种药用植物种子具有较强的诱发突变能力,辐照剂量与种子发芽率、发芽势、发芽指数、活力指数、苗高、苗鲜重均呈负相关,其中与苗高的相关性达极显著水平。益母草和蒲公英种子的半致死剂量大于400 Gy,车前种子的半致死剂量在300~400 Gy之间,紫苏种子的半致死剂量在50~100 Gy之间。

Effects of 60Co-γIrradiation on Seed Germination of Four Medicinal Plants

In this study,different doses of 60Co-γrays were used to radiate the seeds of Leonurus heterophyllus,Taraxacum mongolicum,Asiatic plantain and Perilla frutescens and the germination rate,germination potential,germination index and other indicators were also determined.The above results for further investigating the effects of 60Co-γirradiation on seed germination provided reference for the breeding of new varieties of these four medicinal plants.The effects of 60Co-γrays on the seed germination were studied,and the new varieties of the four medicinal plants were selected for reference.The results showed that 60Co-γradiation had a strong ability to induce mutation in the seeds of four medicinal plants,and the radiation dose was negatively correlated with the germination rate,germination potential,germination index,vigor index,seedling height and fresh weight of seeds.Among them,the negative correlation with seedling height was extremely significant(p<0.01).The semi-lethal dose for L.heterophyllus and T.mongolicum seeds was greater than 400 Gy,while the semi-lethal dose for A.plantain seeds was between 300—400 Gy and the semi-lethal dose for P.frutescens seeds was between 50—100 Gy.