Overview of differentially expressed genes encoding for structural subunits involved in photosynthesis, respiration, nitrogen fixation and transport, and measurements of corresponding metabolic activities.

<p>(A) Protein subunits encoded by genes with higher expression levels under 8% CO₂-enriched conditions are shown in <i>blue</i> color. <i>Red</i> color indicates proteins encoded by genes that are down-regulated under high CO₂. <i>Green</i> colored protein subunits represent genes that are not differentially expressed. Respiratory and photosynthetic electron transport chains are illustrated according to <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056887#pone.0056887-Vermaas1" target="_blank">[42]</a>, and the composition of the NDH1 complex according to <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056887#pone.0056887-Battchikova2" target="_blank">[43]</a>. The corresponding gene expression data are summarized in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056887#pone.0056887.s005" target="_blank">Table S2</a>. (B) The capacity of oxygen evolution at time point L6, (C) nitrogenase activity assayed as acetylene reduction at night and (D) respiration at time point D6. The graphs contain averaged values obtained from three biological replicates. Error bars represent the S.D. from the average.