60Coγ辐射悬铃木种子及其苗期生物学性状调查.pdfVIP

60Co γ辐射悬铃木种子及其苗期生物学性状调查 * 包满珠 李志能 刘国锋 (园艺植物生物学教育部重点实验室，华中农业大学园艺林学学院，湖北 武汉 430070) 摘 要 60 ： 以不同剂量的 Co γ射线辐射悬铃木干种子，测定了不同剂量对悬铃木M 代的影 1 响。结果表明，在50～400Gy范围内，随着剂量的增加，悬铃木种子的萌发率、出苗率、成 苗率降低，株高、鲜重、根长也明显下降。辐射对幼苗生长的抑制作用极显著，50～250Gy 处理各组出真叶期比对照组依次推后2 、5、9、14d。300～400Gy处理组虽有发芽，但幼芽 严重扭曲，15d后逐渐死亡。通过对悬铃木辐射组与对照组成苗率和根长进行比较， 初步推 测悬铃木辐射的半致死剂量为50Gy 。 60 关键词： Co γ射线；辐射育种；萌发率；出苗率；成苗率 EFFECTS OF 60Co γ-RAYS RADIATION ON BIOLOGICAL CHARACTERS OF PLATANUS ACERIFOLIA SEED AND SEEDLINGS * BAO Man-zhu LI Zhi-neng LIU Guo-feng （Key Laboratory of Horticulture Plant Biology, Ministry of Education, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, Hubei, 430070 ） 60 Abstract :The dry seeds of Platanus acerifolia Willd. were radiated with different doses of Co γ-rays and the effect of the radiation on M1 were investigated, which indicated that with increasing of doses within 50～400Gy, the germinating rate, emerged seedling rate and survival seedling rate of Platanus acerifolia Willd. decreased, as well as the plant height, fresh weight and length of root reduced. The radiation inhibited the seeding growth significantly. Comparing with CK, the true leaf emerging time of radiation treatment was late for 2, 5, 9 and 14d respectively, but the young seedings were severely twisted and abnormal, and gradually died after 15 days by 300～400Gy. Comparing the treatment with CK in seeding rate and root growth, we concluded that the semilethal radiation dose of Platanus acerifolia W