不同地理种源小桐子种子对~(60)Co γ射线照射的敏感性研究

研究了10个不同地理种源的小桐子种子对60Coγ射线照射的敏感性。结果表明,辐射剂量与出苗率呈负相关,且不同剂量处理间的相对出苗率差异达显著或极显著水平,线性回归方程的相关系数为-0.89～-0.96,其半致死剂量为127～184Gy。根据半致死剂量可将10个不同地理种源的小桐子划分为辐射敏感型、辐射中间型和辐射迟钝型,其中贵州贞丰鲁容种源(141Gy)和海南乐东莺歌海种源(127Gy)为辐射迟钝型;云南元江种源(184 Gy)为辐射敏感型;其余7个种源为辐射中间型。本研究可为创制小桐子新种质提供重要试验基础。

IRRADIATION SENSIBILITY OF DIFFERENT PROVENANCES OF Jatropha curcas L.Seeds

The irradiation sensibility of 10 provenances of Jatropha curcas L.seeds to ~(60)Co γ-rays was studied.The results showed that the relationship between relative germination rate of the seeds and the doses of irradiation was negative correlation,and the difference of relative germination rate among different doses treatment was significant at 5% probability level or highly significant at 1% probability level.For seeds of different provenances,the correlation coefficient of linear regression was from-0.89～-0.96,and the medial lethal doses(LD 50) of 10 provinces was from 127Gy to 184Gy.According to the LD 50,we could divided 10 provinces of J.curcas L.into sensitive provenance,transitional provenances and obtuse provenances.The provenances of Yuanjiang,Yunan(184Gy) belonged to sensitive provenance;the provenances of Zhenfeng,Guizhou(127Gy) and the provenances of Yuedong,Hainan(141Gy) belonged to obtuse provenance;other 7 provenances belonged to transitional provenances.The results provided important experiment basis for germ plasm resources innovation of J.curcas L.