Studies on phloem exudation from Yucca flaccida Haw. XI. Xylem feeding of 14C-sugars and some other compounds, their conversion and recovery from the phloem exudate

For a number of 14C-sugars and other compounds, it has been shown, that their introduction through the xylem system into detached tops of the inflorescence causes a subsequent exudation of 14C-sucrose from the phloem. D-glucose, D-fructose, D-galactose, maltose and lactose were converted exclusively to sucrose. The fed substance itself was absent in the exudate. Feeding D-sorbitol and K-glycerate led to exudation of these substances together with small amounts of sucrose, whereas L-sorbose, glycerol, glycolic acid and glutamine were not at all converted to sucrose and exuded as such. The results are briefly discussed.