Preliminary research into site-chosen mutation with heavy ion beams for crop breeding

Penetration and site-chosen implantation of spring wheat seeds at HIRFL with 75 MeV/u 16O8+ ions were carried out. The seeds, of which the different sites were implanted by the ions were germinated in room. The frequency of micronuclei and chromosome aberration in their root tip cells was observed. The results of their cultivation in the field were different. Through selection of three year-five generations (adding a generation in southern-China each year), nine stable new strains with high-output, short-straw, disease-resistant, hot dry wind-resistant and early-maturing such as 97852-15-1, 97832-15-3 and 965-15-7 have been obtained and took part in the appraisal test in 1999. Some of them were placed on the regional test in Gansu province in 2001 and there will be hopeful of providing application to production and breeding with them