重离子束对牧草的改良

Improvement of herbage by heavy ion beams

采用 80MeV/u Ne10+ 离子束贯穿处理豆科与禾本科牧草种子,大田和根尖细胞观测的结果表明,随着 20贯穿剂量的增加,幼苗生长明显减弱,呈负相关性。而染色体畸变率和微核率随剂量的增加而显著增加,呈正相关性。同时,从大田长势来看,禾本科牧草比豆科牧草对重离子辐射敏感性强,禾本科牧草适宜剂量为20—30Gy,豆科牧草为 150Gy。

Herbage seeds of legume and grass were irradiated in penetration by 80 MeV/u Ne10+ ions. The re- 20 sults of field tests and observations of the root?tip cells showed that growth of the seedlings was obviously weakened with increasing doses. Frequencies of chromosomal aberration and micronucleus increased significantly with in- creasing doses. According to the field growth tests, radiation sensitivity of grass herbage to the heavy ion beams was much higher than leguminous herbage, and suitable dose of the heavy ion irradiation for the grass and leguminous herbages is 20—30Gy and 150Gy, respectively.