The Movement of Sugars into the Sieve Elements of Bark Strips of Willow: I. METABOLISM DURING TRANSPORT

Publisher Website
Google Scholar
Abstract
14C-labelled sugars (sucrose, glucose, and fructose) were supplied to the cambial surface of bark strips of willow, and in conjunction with the aphid stylet technique (Weatherley, Peel, and Hill, 1959), the movement into and distribution of activity in the sieve tube sap was examined. As well as sucrose, free hexoses and sugar phosphates were found to contain the 14C-label, and rapid interconversions occurred between these compounds somewhere along the entry route. Sucrose entry into the sieve elements was accompanied by at least a partial breakdown into its component hexoses, and the involvement of a sugar phosphate pool was also demonstrated. Possible transformation sites on the entry route between the solution bathing the cambial surface and the sieve element vacuole are discussed.