Involved in the plastidial phosphorylated pathway of serine biosynthesis (PPSB). (2R)-3-phosphoglycerate + NAD(+) = 3-phosphooxypyruvate + H(+) + NADH Partially inhibited by 1 mM serine. Amino-acid biosynthesis; L-serine biosynthesis; L-serine from 3-phospho-D-glycerate: step 1/3. Expressed in aerial parts. Not detected in roots and meristematic tissue. Expressed in cotyledons, adult leaves, stigma and anther filaments. Detected in the embryo. Up-regulated in the aerial parts by dark treatment. Not regulated by high CO(2) levels. No visible phenotype. Belongs to the D-isomer specific 2-hydroxyacid dehydrogenase family.