论文
LIU Lu-xiang~1 HAN Wei-bo~(1,2) GUO Hui-jun~1 ZHAO Lin-shu~1ZHAO Shi-rong~1 LI Jia-cai~3 WANG Jing~1 ZHENG Qi-cheng~1(1.Institute of Crop Science, Chinese Academy of Agricultural Sciences/ Key Lab of Agricultural Nuclear Technology &Aerospace Breeding, Ministry of Agriculture, Beijing, 100081;2.North-west Sci-tech University of Agriculture and Forestry, Yangling, Shaanxi, 712100; 3. Institute of High Energy Physics, Chinese Academy of Science, Beijing, 100093)
Dry seeds of two genotypes of winter wheat ZY9 and ZH7 were irradiated by mixed high-energy particle field with different doses of 0, 109, 145, 195, 284 and 560Gy, which was generated from E2 beam lines of LINAC of Beijing Electron Positron Collider. The cytological effects on root tip cell of wheat seeds were studied with the same dosage of γ-rays irradiation as a control. The results showed that the irradiation of mixed high-energy particle field inhibited mitoses and produced various chromosomal aberrations such as micronucleus, chromosome bridges, circular chromosomes and dissociative chromosomes in root tip cells of wheat with significant dose-effects. Higher rate of cytological damages and percentage of chromosome circles and fragments were found in the mixed particle field irradiation than in γ-rays irradiation, indicating in the relative higher biological effects of irradiation of mixed high-energy particle field than those of γ-rays in the M_1 generation of wheat.