Study the Vigour and Early Growth of Resistant and Susceptible Biotypes of Wild Mustard (Sinapis arvensis L.) to Acetolactate Synthase Inhibitors Under Different Environmental Conditions

In order to study the effect of drought stress and salt stress and temperature on Germination and Seedling vigour of resistant and susceptible biotypes of wild mustard (Sinapis arvensis L.) to Acetolactate Synthase Inhibitors from three provinces Golestan, Kermanshah and Khoozestan, three experiments were conducted as factorial based on completely randomized design in four replications. Different salt and drought stresses levels were 0, -3, -6, -9 and -12 bar that created by NaCl and PEG respectively. Examined temperatures were 0, 5, 10, 15, 20, 25, 30 and 35°C. In each three experiments second factors was Biotypes of Wild Mustard include three susceptible (Ker-1, Kh3 and G9) and three resistant biotypes (Ker-2, Kh5 and G3). Studied traits were germination percent and rate, seedling length and seedling vigor index. Result showed salt and drought stresses reduced vigor and early growth of all biotypes but this reduction was different in biotypes. Optimum temperature for all biotypes were observed in 15 and 20°C. In almost conditions, different of resistant and susceptible biotypes of Golestan were not significant but in Khuzestan province, vigour of resistant biotype was lower than susceptible biotype but about Kermanshah biotypes, resistant biotype in many conditions had higher vigour than susceptible biotype. Results showed that resistant biotype of Golestan and Kermanshah caused to high vigor, in competition with susceptible biotypes and crop had better and faster germination and have to find other herbicide or nonchemical methods to control these biotypes.