氮离子束注入与贯穿小麦种子的生物效应初步研究

Abstract

采用４７．９ＭｅＶ／ｕ和２０．４ＭｅＶ／ｕ１４Ｎ（７＋）离子束对小麦种子进行生物学效应研究。结果表明：１）重离子的贯穿和注入对小麦种子的生长势均有明显的抑制作用，剂量越大，抑制作用越强，而且注入作用高于贯穿；２）在种子的根尖细胞中出现的染色体畸变具有多种类型，畸变频率高于对照组１９８～５９２倍，而且注入比贯穿作用强；３）注入和贯穿处理两者同样有明显的诱变作用，可引起ＤＮＡ的损伤和修复The biological effects of wheat seeds irradiated by 47.9 MeV/u and 20. 4 MeV/u 14N+7 ion beams were studied respectively .The results showed: (1 )The heavy ions of both penetration and implantation can all significantly inhibit growing power of wheat seeds. The greater dose is, the greater growing power is inhibited, and implantation influence on growing power is stronger than penetration.(2) In root tip cells of irradiated seeds, a great variety of chromosomal aberrations were observed, the aberration国家自然科学基金,“八五”重点课