Drought Resistance and Identification Method and Evaluation Index in Brassica napusI.Imitation System of Drought Resistance Identification at Early Stage Growing

Twenty rapeseed cultivars(Brassica napus L.) were taken as experimental materials at germination stage.Different mass concentrations of PEG-6000 were chosen to produce different drought.The root length,shoot length,total length,root/shoot ratio,root fresh mass,shoot fresh mass,total fresh mass,root dry mass,shoot dry mass and total dry mass were measured in simulated drought stress.200 g/L PEG-6000 was the optimum concentration used to produce drought stress according to the ten morphological indexes at early growing stage.