Volemitol (D-Volemitol) is a seven-carbon sugar alcohol that fulfills several important physiological functions in certain species of the genus Primula. Volemitol is the major nonstructural carbohydrate in leaves of all stages of development. Volemitol functions as a photosynthetic product, phloem translocate (phloem-mobile), and storage carbohydrate.Volemitol biosynthesis proceeds by a novel, NADPH-dependent, ketose reductase (sedoheptulose reductase)[1].
[1]. Hafliger B, et al. Metabolism of D-glycero-D-manno-heptitol, volemitol, in polyanthus. Discovery Of a novel ketose reductase1. Plant Physiol. 1999 Jan;119(1):191-8.