علیرضا یدوی

To evaluate the effect of plant growth regulator (cycocel) on proline, total soluble sugars, protein, oil and fatty acids profile under drought stress, a factorial pot experiment was conducted based on completely randomized design with four replications at Research Laboratory of Yasouj University in the spring of 2009. Treatments were three levels of drought stress including without, mild and severe stress and six concentration levels of cycocel including four foliar sprays 0, 500, 1000 and 1500 ppm during the rapid growth of plant and two seed soaking levels 10-5 and 10-6 mM for 24 hours before planting. Results showed that all levels of cycocel foliar spray increased proline and soluble sugars compared to the control under non-stressed conditions. Stress could significantly increase grain protein, and the 10-6 mM seed soaking treatment increased seed protein (20%) under stress conditions. Increased concentrations of foliar sprayed cycocel reduced oil percentage from 39.2% to 35.7% and stress also decreased this trait. In non-stressed treatment, the level of 10-6 mM cycocel seed soaking showed a positive significant effect on the amount of linolenic acid; while this amount was reduced (15%) by increasing the cycocel spraying concentration. Moreover, drought stress increased the content of saturated fatty acids Oleic, palmatic and stearic. Overall, cycocel could compensate the damages caused by drought stress to some extent.