On the cover: Photosynthetic acclimation to elevated CO2 can be intensified by low N availability. Vicente et al. (on pp. 2133-2146) performed an integrative transcript, biochemical and physiological analysis to assess the effects of elevated CO2 at two NO3− concentrations on durum wheat-grown hydroponically. They showed that photosynthetic acclimation to CO2 enrichment at low NO3- supply was associated with inhibition of leaf NO3− assimilation, while at high NO3− levels, up-regulation of root N metabolism attenuated the acclimatory response to elevated CO2.