Effect of cycocel and micronutrients on antioxidants rates as indices of drought resistance of rapeseed

Effect of micronutrients and cycocel in drought tolerance of rapeseed was determined by using split factorial design on RCBD with 12 treatments and 4 replications. Experiment was done in research farm of Arak Islamic Azad University during 2007-2008. The treatments considened by irrigation as main factor in 2 levels (normal and drought), 3 levels of micronutrients (0, 1, 1.5 lit/ha) and 2 levels cycocel (0, 1.5lit/ha) as sub factors. 22 variables were determined which were included plant height, full and empty pod number per plant, pod weight per plant, pod number per stem and sub-branch, seed number per pod, stem diameter, seed weight per plant, 1000 seed weight, seed yield, total dry weight, harvest index, relative water content, ionic leakage, SOD, CAT, GPX, MDA, di-Tyro, 8-oh-dg. Result indicated high significant increase in antioxidant enzymes rate in drought condition which means the defensive mechanism of plant in drought condition. Micronutrients caused high significant difference in antioxidant enzymes rate between drought and normal condition so that caused drought tolerance in plant by decreasing the pressure of tension. In addition cycocel consuming resulted in high significant plant height decrease and stem diameter increase due to drought tolerance.