SSR ANALYSIS ON M_1 VARIATION OF WHEAT IRRADIATED BY MIXED HIGH ENERGY PARTICLE FIELD

Dry seeds of two winter wheat genotypes,ZY9 and ZH7,were irradiated by simulative cosmic rays of mixed high-energy particle field(shorted as CR) with different dosages of 0,109,145,195,284 and 560Gy,which was generated from E2 of LINAC of Beijing Electron Positron Collider,()~(60)Co γ-rays irradiation of the same dosage as the control.The results indicated that there were dose-effects on seedling height and root length of CR irradiation.The total rate of polymorphic loci in genome B was 46%,which was the highest in the three wheat genomes,implying B genome might be the hotspot mutation genome in wheat.The microsatellite DNA damage caused by CR was more serious than those of γ-rays in the M_1 generation of wheat.