Schematic representation of the NPQ enhancement and the metabolic machinery reconfiguration in K. veneficum under P deprivation inferred from the iTRAQ comparative proteomic analysis. Glycolysis (red arrows), tricarboxylic acid (TCA) cycle (orange arrows), lipid metabolism (purple arrows), pyrophosphate hydrolysis (gray arrows), NPQ and chloroplast avoidance movement were strengthened while photochemistry, genetic information flow (e.g., DNA replication, transcription, translation, and post-translation, blue arrows) and phosphonate metabolism (light blue arrows) were weakened under P deprivation in K. veneficum. Representative up-regulated or down-regulated proteins under P deprivation are indicated in white font with a green or blue background, respectively. LHCs, light harvesting protein complexes; LHCX, light-harvesting complex stress-related family proteins; PHOT2, Phototropin-2; ALDO, fructose-bisphosphate aldolase; TPI, triosephosphate isomerase; GAPDH, glyceraldehyde phosphate dehydrogenase; PGK, phosphoglycerate kinase, ENO: enolase; GPDH, Glycerol-3-phosphate dehydrogenase; snRNP, small nuclear ribonucleoprotein.