Abstract: Seeds of Brassica napus lines 761 and 532, were irradiated by ⁶⁰Coγ rays with doses of 800, 1000, 1200 Gy, respectively. Our objectives were to investigate ⁶⁰Coγ rays influence on rapeseed seed germination rate, seed quality and main agronomic characters. The results showed that germination rate of treated seeds were decreased with the increase of irradiation doses, 532 was more tolerant to ⁶⁰Coγ rays than line 761. It was observed that significant inhibition of plant height and biomass occurred in plants of M₁ generation. A number of quantitative traits were investigated to verify the effects of radiation and the responses to ⁶⁰Coγ rays treatment varied with traits considered. Of them primary branch height seemed most detectable in irradiation effects, plant height and primary branch height in M₂ individuals were observed decrease, but no significant change of 1000-seed weight and seed number per siliqua. Treatment of 800-1000 Gy ⁶⁰Coγ rays irradiation increased oil content in different degrees, the oleic acid and erucic acid content have distinctly changed.

Key words: Rapeseed (Brassica napus L.), ⁶⁰Co&gamma, rays, Induced mutation breeding, Agronomic characters

CLC Number: 

• S634.301