Co60-γ射线辐照对马蔺种子萌发的影响

为了在西北干旱半干旱地区大面积繁育推广马蔺这一耐盐碱、耐干旱的植物品种,对马蔺(Iris)种子进行了物理和化学处理以促进其萌发.物理处理主要使用不同强度的Co60-γ射线辐照种子,而化学处理则是用500mg/kg细胞分裂素溶液浸泡种子.通过对发芽率及各种田间试验数据的分析,证明打破马蔺种子休眠、促进其萌发的最适处理方法是Co60-γ射线辐射+热水浸泡;Co60-γ射线辐射的基本剂量范围确认在0.2580～0.9030C/kg,计量率为2.58×10-4C/(kg*s),浸泡热水温度以65℃为宜.该项研究工作对于西北地区开发新的饲料、药用植物资源、恢复改善当地生态环境、繁荣地方经济均具有一定的理论和实际意义.

A Study on the Germination of Iris lactea Pall.var chinensis Koid Z.Seeds under Co60-γ Radiation

In order to regenerate and popularize the drought- and salt-tolerance economical plant Iris in northwest China,the physical and chemical treatment methods that can stimulate germination of the Iris seeds have been studied.The physical treatment is Co60-γ radiation with different radioactive intensity and the chemical treatment is to soak the seed into the 500mg/kg solution of cytokinin(gibberellin)for 36h.Based on both laboratory and field experiment,the most effective way to disturb the seed dormancy and accelerate the germination is hot water soaking plus Co60-γ radiation.The suggested radiation intensity is 0.2580～0.9030C/kg and the corresponding radioactive density is 2.58×10-4 C/(kg*s).The proper water temperature to soak the seeds is 65℃.The present study is of significance in developing new fodder and medicine-use plants;it is also helpful to restore the deteriorated eco-environment in northwest China and to flourish the local economy.