Abstract: Gene mutation ratio could be improvedby irradiation.To study the rote of irradiation techniques in the rela -tionship between irradiation dosage and generation after irradiation is important?3 cultivars of soybean were irradiated by 6 irradiation dosages of ⁶⁰ Co -rays, 50, 100, 150, 200, 250, 300 Gy and 0 Gy( ck), respectively, and the ratio of irradiation dosage was 1.2Gy/ m in this paper.Based on the living plant ratio inM ₁ and the mutation effect inM ₂, the best irradiation dosage and the irradiation dosage in M₂were evaluated in the test.The results showed that the mean value of the agronomic characters which were control growth was in negative correlation with the irradiation dosage in the M₁ generation by ⁶⁰ Co -rays.The equation follows as y= 0.0001x² - 0?381x+ 102.9( R ² = 0962 7^**) ;The best irradiation dosage was different in cultivars andtheir mean value was 144.3 Gy; and the plant height, mainnode number, pod length, pod and grain number per plant and hundred -grain -weight were affected by different irradiation dosage in M₂, and the more irradiation dosage, the greater effect in a certain extent; gene mutation enabled the plants to exceed their parents in M-generation.

Key words: Soybean, Irradiation, Agronomic characters, Mutate effect

CLC Number: 

• S565.1