In order to investigate the effects of water stress and plant growth regulators PGRs on yield and yield components in wheat, an experiment was conducted on the Demonstration Farm of the Faculty of Agriculture, University of Kassala at Halfa Elgadidah, Sudan. The experiment was arranged in split-plot design with three replications. The watering treatments in this study are designated as W1 and W2 where plants were irrigated every 10 and 20 days, respectively. The seven growth regulators levels are designated as G50, G75,G100 (corresponding to gebbraline hormone rates of 0,50,75 and 100ppm), NA50, NA75, NA100 (corresponding to Nephethaline acitic acid rates of 50,75 and 100ppm) and control (GON0)with zero level of PGRs. The results revealed that, W1and application of G100 or low level of NAA increased plant height, leaf area and yield attributes (grain filling rate, spike length, number and weight of grains per plant and grain yield per unit area).further, application of GA3at 100 ppm increased grain yield (kg/ha) by more than 69% relative to NAA at the same rate. It was concluded that plant growth regulator (GA100 or NAA50) with W1 may be better to achieve higher seed yield and yield components in wheat.

Keywords : Plant Growth Regulators, Water Stress, what, yield.