The tissue accumulation of sucrose, glucose, and fructose has been studied in cultured cotton (Gossypium hirsutum L.) roots and leaf discs. Sucrose uptake by both tissues from high apoplastic concentrations was independent of pH but has a slightly acidic pH optimum from low concentrations. Like other higher plant tissues, cotton root cells accumulate sucrose via a ;saturable,' inhibitor-sensiti...

Conversion of [(14)C]galactose (Gal) 1-P, UDP-[(14)C]Gal, or UDP-[(14)C]glucose to [(14)C]sucrose was observed when cell-free homogenates of cucumber (Cucumis sativus L.) fruit peduncles were incubated with individual (14)C-labeled substrates, appropriate cofactors, and fructose. The sucrose product was labeled only in the glucose moiety. Conversion of [(14)C]Gal-1-P to [(14)C]sucrose was catal...

The involvement of apoplastic invertase (Ap Inv) and sucrose synthase (SuSy) in the somatic embryo development of black spruce (Picea mariana) was investigated under different maturation conditions. Replacing 6% sucrose with 3% or 1% sucrose in the maturation medium drastically decreased Ap Inv activity and amount in embryogenic tissues. This was accompanied by a decrease in the hexose pool tha...

Trees are generally assumed to be symplastic phloem loaders. A typical feature for most wooden species is an open minor vein structure with symplastic connections between mesophyll cells and phloem cells, which allow sucrose to move cell-to-cell through the plasmodesmata into the phloem. Fraxinus excelsior (Oleaceae) also translocates raffinose family oligosaccharides in addition to sucrose. Su...

BACKGROUND AND OBJECTIVE Increasing data suggest that neonatal pain has long-term consequences. Nonpharmacologic techniques (sucrose taste, pacifier suckling, breastfeeding) are effective and now widely used to combat minor neonatal pain. This study examined the analgesic effect of sucrose combined with radiant warmth compared with the taste of sucrose alone during a painful procedure in health...

Allium cepa L. is a widely cultivated and economically significant vegetable crop worldwide, with beneficial dietary and health-related properties, but its sucrose metabolism is still poorly understood. To analyze sucrose metabolism during bulb swelling, and the development of sweet taste in onion, a global transcriptome profile of onion bulbs was undertaken at three different developmental sta...

OBJECTIVE To evaluate the effect of sodium fluoride rinse on sucrose-induced decrease in plaque pH with interdental plaque pH telemetry. METHODS Six participants wearing partial lower prostheses incorporating a miniature glass pH electrode were included. The measurement of plaque pH was performed after 6 days of plaque accumulation. Three experiments were performed to test the effects of fluo...