零磁空间处理水稻干种子诱变效应研究

利用零磁空间对水稻干种子进行诱变处理 ,研究其细胞学和生物学效应。结果表明 :零磁空间处理水稻干种子后 ,当代细胞染色体畸变频率提高 ,畸变类型以染色体桥和微核高于其他畸变类型 ;从生物学效应来看 ,零磁空间处理对当代发芽率、成苗率、苗高和分蘖有促进生长作用 ;M2 变异类型丰富 ,早熟类型突变频率相对较高 ,而育性分离较大 ,各类分离程度大小依次为 :早熟 >育性 >株高 >穗型 >粒型 ;当选变异类型单株后代稳定快 ,说明零磁空间诱变处理在水稻品种改良方面很有前途

STUDY ON MUTAGENIC EFFECTS OF MAGNETIC FIELD-FREE SPACE ON DRY RICE SEED

Cytological and biological effects of magnetic free space on dry rice seed were studied.The results showed that the chromosomal aberration rate was higher than that of controls,and the rates of chromosomal bridges and the micronucleus were greater than that of other types of aberration.The seed germination rate,seedling survival rate,seedling height and tilling were promoted in M 1 generation.More segregation of characters such as early heading and fertility were appeared in M 2 generation.In the all variations in M 2,the highest rate of mutant type was early heading stage and the greatest segregation degree was fertility.The M 2 segregation degree was in order of early heading>fertility>plant height >ear type>grain type.All mutant characters were generated steadily.It is concluded that there is a practical value in rice variety improvement by using the method of magnetic free space treatment.