The ethyl methane sulfonate(EMS) was applied to treat the pure seeds of the ‘double low’cultivarZheshuang 72(Brassca napus L.).Mutants with abnormal appearance of leaf color,branch number,plant height,stem or flower color,floral fertility and life cycle were observed in M1 population,screened in the M2 population and partly verified in the M3 population.In general,the mutants accounts for 8.46% of the total population in the M2 generation.Correlation analysis among the fatty acids and between the fatty acid...