Transcripts encoding proteins associated with photorespiration, carbon fixation, and sucrose and starch synthesis that were differentially expressed 2 d and 4 d after transfer from growth at high CO₂ to air. Transcripts with P-values <0.05 and fold changes (log₂) of >0.5 and less than –0.5 are shown. Grey bars, 2 d after transfer; white bars, 4 d after transfer. A, carbon metabolism; B, nitrogen and sulphur metabolism.