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We review recent evidence for a clear association between accretion ontosupermassive black holes and star formation up to z~1 in the zCOSMOS survey.Star formation rates (SFRs) are determined from the [OII] emission-linestrength and a correction for the AGN contribution. We find that SFRs of X-rayselected AGN span a distribution of 1-100 solar masses per year and evolve in amanner that is indistinguishable from that of massive, star-forming galaxies.The close relationship between AGN activity and star formation is furthersupported by an increase in the AGN fraction with bluer rest-frame colors(U-V); we further illustrate how the location of AGNs in a color-magnitudediagram can be misleading in luminosity-limited samples due to the dependenceof AGN activity on the stellar mass and the low mass-to-light ratios of bluecloud galaxies. To conclude, our results support a co-evolutionary scenario upto z~1 based on the constancy with redshift of the ratio between mass accretionrate and SFR.

Star formation in galaxies hosting Active Galactic Nuclei up to z~1