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Table 2 Electron demands and supply in PCC6803 at the investigated sink–source ratios with ammonium or nitrate as N source

From: Electron balancing under different sink conditions reveals positive effects on photon efficiency and metabolic activity of Synechocystis sp. PCC 6803

  LLHC HLHC HLLC
NH4 NO3 NH4 NO3 NH4 NO3
r C 64 ± 10 71 ± 7 232 ± 37 342 ± 49 101 ± 18 111 ± 11
r nitrate 30 ± 4 141 ± 24 41 ± 6
r D 64 ± 10 101 ± 11 232 ± 37 483 ± 74 101 ± 18 153 ± 17
r O,gross 147 ± 6 190 ± 5 417 ± 13 668 ± 17 180 ± 6 203 ± 5
r AEF 179 ± 17 219 ± 12 626 ± 36 1209 ± 65 92 ± 13 231 ± 16
  1. All rates are given in µmol electrons mg CDW −1  day−1. Mean values and standard deviations were calculated for three different measurement days. See “Materials and methods” for details on the measurements. The cellular electron demand (rD) was calculated from the electron demand for carbon fixation (rC) and nitrogen assimilation (rnitrate). The electron supply rate (rO,gross) is derived from the sum of rO and rResp. The alternative electron flux (rAEF) is calculated by subtracting rO,gross from the fluorescence-based electron flux (derived from rF)