Carbohydrate Translocation in Sugar Beet Petioles in Relation to Petiolar Respiration and Adenosine 5′-Triphosphate 1
AUTOR(ES)
Coulson, C. L.
RESUMO
Earlier studies have shown that the retarding effect of low petiolar temperatures on sucrose transport through sugar beet (Beta vulgaris L.) petioles is markedly time-dependent. Although the initial effect of chilling the petiole to near 0 C is severely inhibitory, translocation rates soon recover (usually within about 2 hours) to values at or near the control rate. In the present studies, selected metabolic parameters were measured simultaneously with translocation. No stoichiometric relationships among petiolar sucrose transport, petiolar respiration (CO2 production), and calculated petiolar ATP turnover rates were evident. It appears that the major sources of energy input energizing carbohydrate transport in sieve tubes function mainly at either loading or unloading sites and not at the level of individual sieve-tube elements.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=366080Documentos Relacionados
- Solute Distribution in Sugar Beet Leaves in Relation to Phloem Loading and Translocation 1
- Rapid Increase in Adenosine 5′-Triphosphate during Early Wheat Embryo Germination 1
- Reduction of Water Permeability in Potato Tuber Slices by Cyanide, Ammonia, 2,4-Dinitrophenol, and Oligomycin and Its Reverse by Adenosine 5′-Triphosphate and Cytidine 5′-Triphosphate 1
- Photophosphorylation Can Provide Sufficient Adenosine 5′-Triphosphate to Drive K+ Movements during Stomatal Opening 1
- Leaf Structure and Translocation in Sugar Beet 1