Turgor-mediated transport of sugars

Conference · Tue Apr 01 04:00:00 EST 1986 · Plant Physiol., Suppl.; (United States)

OSTI ID:5017092

Daie, J

Membrane associated processes have been suggested to be modulated by cellular turgor. The nature of this regulation is not, however, clearly understood. Evidence is presented that active but not passive transport of sugars is turgor regulated. Isolated phloem tissue, vascular bundles or storage parenchyma of celery were incubated in buffered solutions adjusted to 100, 200 or 400 m osmolal that contained various concentrations of /sup 14/C-sugars. Cellular turgor was manipulated by using the non-permeating PEG (3350). Saturating carrier-mediated sucrose transport which is present only in phloem-containing tissue was enhanced under low turgor conditions. Sucrose diffusion, the predominant mode of uptake in non-phloem parenchyma tissue was not affected by cellular turgor. Furthermore, GA and IAA seem to interact with cellular turgor to bring about modified rates of sucrose uptake. The data are consistent with observations that sucrose loading is enhanced under mild water deficit conditions.

• Research Organization: Rutgers Univ., New Brunswick, NJ
• OSTI ID: 5017092
• Conference Information: Journal Name: Plant Physiol., Suppl.; (United States) Journal Volume: 80:4
• Country of Publication: United States
• Language: English

Related Subjects

551001* -- Physiological Systems-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL STRESS
BODY
CARBOHYDRATES
CARBON 14 COMPOUNDS
CELL CONSTITUENTS
CELL MEMBRANES
LABELLED COMPOUNDS
LABELLING
MEMBRANE TRANSPORT
MEMBRANES
ORGANIC COMPOUNDS
PLANT CELLS
PLANT TISSUES
SACCHARIDES
TISSUES
UPTAKE