Underlying regulatory network of drought stress response in cereal crop proteomes. Within the plant cell, upregulation of key responsive proteins under drought stress has been demonstrated which are important for plant stress tolerance or resistance. NUC, Nucleus; MIT, Mitochondria; CHL, Chloroplast; 2Cys-Prx, 2-cysteineperoxiredoxin; APX, ascorbate peroxidase; SOD, superoxide dismutase; GST, glutathione S-transferase; Trx-h, thioredoxin h; COMT, caffeoyl-coenzyme A O-methyl transferase; LEA, Late embryogenesis-abundant (protein); TPI, triose phosphate isomerase; V-ATPase, vacuolar ATPase; RubisCO LSU, RubisCO large subunit; GAPDH, glyceraldehyde-3-phosphatedehydrogenase; ABA, abscisic acid; SnRK, sucrose non-fermenting-related protein kinase; MDH, malate dehydrogenase; PP2C, Protein phosphatase 2C; OEE, oxygen evolving enhancer(protein); HSPs, heat shock proteins; ROS, Reactive oxygen species; CAT, catalase; NCED, 9-cis-epoxycarotenoid dioxygenase; SLAC 1, Slow anion channel-associated 1; GORK, Gated outwardly-rectifying K+ channel; KAT 1, Potassium channel; RS, ROS induced signaling; PYR/PYL/RCAR, PYRABACTIN RESISTANCE1 (PYR1)/PYR1-LIKE (PYL)/REGULATORY COMPONENTS OF ABA RECEPTORS.