Phosphorylates the second messenger diacylglycerol (DAG) to generate phosphatidic acid (PA), another important signaling molecule. PA is required for plant development and responses to abiotic stress and pathogen attack. May be involved in the accumulation of PA during cold stress xhibits high specificity for 1,2-dioleoyl-sn-glycerol (1,2-DOG), 1-palmitoyl, 2-oleoyl-sn-glycerol (1,2 POG), 1-stearoyl, 2-linoleoyl-sn-glycerol (1,2-SLG) and 1-oleoyl, 2-palmitoyl-sn-glycerol (1,2-OPG). a 1,2-diacyl-sn-glycerol + ATP = a 1,2-diacyl-sn-glycero-3-phosphate + ADP + H(+) Optimum pH is 6.8. Monomer. Highly expressed in flowers, and at low levels in roots, stems and leaves. Belongs to the eukaryotic diacylglycerol kinase family. Intron retention. Intron retention. Intron retention.