The Site of Synthesis of Sucrose in Green Plant Cells

Abstract
Glycollic acid-1-14C, glyoxylic acid-2-14C, glycine-1-14C, and glycine-2-14C were fed to illuminated excised leaves of Pisum sativum and the distribution of 14C determined in the glycine, serine, sucrose, and insoluble polyglucan formed. Carboxyl-labelled glycollic acid and glycine gave rise to randomly labelled polyglucan and sucrose although the serine formed was predominantly carboxyl labelled. By contrast glyoxylic acid and glycine labelled in the α-carbon did not give rise to randomly labelled serine, sucrose, or polyglucan.