60Co-γ射线辐射对番茄种子萌发及早期幼苗生长的影响  

Effect of ^(60)Co-γ Irradiation on Germination of Tomato Seeds and Early Seedling Growth

作　　者：朱宗文[1,2] 查丁石[1] 朱为民[1] 郭世荣[2] 朱龙英[1] 

机构地区：[1]上海市农业科学院园艺研究所,上海市设施园艺技术重点实验室,上海201106 [2]南京农业大学园艺学院,江苏南京210095

出　　处：《种子》2010年第8期15-18,22,共5页Seed

基　　金：国家863计划(2007AA100104);果菜类蔬菜航天工程种质创新与新品种选育(2007AA100104);“十一五”国家科技支撑计划(2008BAD97B06);茄果类蔬菜作物空间环境诱变育种关键技术研究与示范

摘　　要：用0～800 Gy剂量范围的60Co-γ射线对2个品种的番茄干种子和引发种(30%PEG-6000引发)进行辐射处理,采用发芽盒发芽法研究60Co-γ射线对番茄种子的萌发效应。结果表明,不同品种间对60Co-γ射线敏感性差异显著。黄盆栽抗辐射能力强于1479,主要表现在种子发芽率、萌发速度上。不同萌动状态番茄种子对辐射的敏感性也不同,经过30%PEG引发的引发种对辐射较干种子敏感。大剂量辐射后种子虽能萌发,但其幼苗生长受到明显的抑制,主要表现在胚根的分化和生长上。根据半致死剂量(LD 50)可以确定番茄种子适宜的辐射剂量,黄盆栽500～600 Gy,1479为400～500 Gy。Two different germination status of tomato cultivar 1479 and yellow pot-cultivate were irradiated by 60 Co-γ rays from 0 Gy to 800 Gy.The effects of the radiation on seed germination and early seedling growth characters were investigated by the method of germination box testing.Different varieties showed significant differences to sensitivity of 60Co-γ rays.The results indicated that the inhibitory effect of 60Co-γ rays on germi-nation of 1479 was much larger than that of yellow pot-cultivate,which mainly manifested in the germination rate and germination velocity.Different germination status of seeds showed different sensitivity to irradiation.30% PEG priming seeds had a stronger sensitivity compared with dry seeds.Although high-dose radiation could not inhibit seeds germination completely,inhibited the growth of the seedlings significantly,mainly demonstrated by the differentiation and growth of radicle.Semi-lethal dose（LD50） could be used to determine the appropriate dose of 60Co-γ irradiation,and yellow pot was 500 Gy to 600 Gy,1479 was 400 Gy to 500 Gy.

关 键 词：60CO-Γ辐射 番茄 干种子 引发种 萌发 

分 类 号：S641.2[农业科学—蔬菜学]