a (9Z,12Z)-octadecadienoyl-containing glycerolipid + 2 reduced [2Fe-2S]-[ferredoxin] + O2 + 2 H(+) <=> (9Z,12Z,15Z)-octadecatrienoyl-containing glycerolipid + 2 oxidized [2Fe-2S]-[ferredoxin] + 2 H2O
a (9z,12z)-octadecadienoyl-containing glycerolipid + 2 reduced [2fe-2s]-[ferredoxin] + o2 + 2 h(+) <=> (9z,12z,15z)-octadecatrienoyl-containing glycerolipid + 2 oxidized [2fe-2s]-[ferredoxin] + 2 h2o