Percentage of reduction (A) and increase (B) in biomass, chlorophyll contents, antioxidants and osmoprotectants in wheat varieties grown under control and drought condition. RL, root length; R/S ratio, root and shoot ratio; TSP, total soluble proteins; GB, glycine betaine; POD, peroxidase; SOD, superoxide dismutase; CAT, catalase; MDA, malondialdehyde.