Effect of Drought Stress on Antioxidant System and Reactive Oxygen in Chorispora bungeana Plantlets in vitro Cloning and Prokaryotic Expression of Chorispora bungeana CbMAPK3 Gene Physiological responses of Chorispora bungeana seedings in vitro to drought stress simulated by PEG-6000 Method of Detecting Phospholipase D Activity and Analyses of Kinetic Parameters in Chorispora bungean Isolation and Expression of a Gene Encoding CBF/DREB1 Transcription Factor from Chorispora bungeana