Warning: Undefined array key "mm" in /www/wwwroot/www.ai-bt.com/si.php on line 10 Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /www/wwwroot/www.ai-bt.com/si.php on line 10 Proton co-transport of sugars in phloem loading.

Literature DB >> 24420097

Proton co-transport of sugars in phloem loading.

Abstract

Loading of (14)C-labelled sugars from the hollow petiole of Ricinus communis L. was stimulated by potassium and by low pH in that both the (14)C-activity and the sugar concentration of phloem sap collected from a nearby incision increased. A pH drop was observed in the solution perfusing a hollow petiole. This pH drop was greater in the presence of potassium and less in the presence of sugars, while the uncoupler CCCP induced a pH rise in the perfusing solution. Sugars were detected in the perfusing solution when it was buffered at pH>9. A model is proposed for a proton co-transport of sugars from the free space driven by a linked proton efflux/potassium influx pump.

Entities: Chemical Species

Year: 1977 PMID： 24420097 DOI： 10.1007/BF00384903

Source DB: PubMed Journal: Planta ISSN： 0032-0935 Impact factor: 4.116

4 in total

1. The distribution of adenosine triphosphatase activity in differentiating and mature phloem cells of Nicotiana tabacum and its relationship to phloem transport.

Authors: J Gilder; J Cronshaw
Journal: J Ultrastruct Res Date: 1973-09

12 in total

1. Phloem loading in Vicia faba leaves: Effect of N-ethylmaleimide and parachloromercuribenzenesulfonic acid on H(+) extrusion, K (+) and sucrose uptake.

Authors: S Delrot; J P Despeghel; J L Bonnemain
Journal: Planta Date: 1980-07 Impact factor: 4.116

2. Mineral nutrition and water relations of hemiparasitic mistletoes: a question of partitioning. Experiments with Loranthus europaeus on Quercus petraea and Quercus robur.

Authors: G Glatzel
Journal: Oecologia Date: 1983-02 Impact factor: 3.225

3. Localized inhibition of translocation of (14)C-assimilates in the phloem by valinomycin and other metabolic inhibitors.

Authors: J Willenbrink; W B Schuster
Journal: Planta Date: 1978-01 Impact factor: 4.116

9. Symplastic isolation of the sieve element-companion cell complex in the phloem of Ricinus communis and Salix alba stems.

Authors: A J van Bel; R Kempers
Journal: Planta Date: 1991-12 Impact factor: 4.116

10. Sucrose uptake by cotyledons of Ricinus communis L.: Characteristics, mechanism, and regulation.

Authors: E Komor
Journal: Planta Date: 1977-01 Impact factor: 4.116

Proton co-transport of sugars in phloem loading.

1. The distribution of adenosine triphosphatase activity in differentiating and mature phloem cells of Nicotiana tabacum and its relationship to phloem transport.

2. Lactose transport coupled to proton movements in Escherichia coli.

3. Proton-coupled hexose transport in Chlorella vulgaris.

4. The chemical composition of Ricinus phloem exudate.

1. Phloem loading in Vicia faba leaves: Effect of N-ethylmaleimide and parachloromercuribenzenesulfonic acid on H(+) extrusion, K (+) and sucrose uptake.

2. Mineral nutrition and water relations of hemiparasitic mistletoes: a question of partitioning. Experiments with Loranthus europaeus on Quercus petraea and Quercus robur.

3. Localized inhibition of translocation of (14)C-assimilates in the phloem by valinomycin and other metabolic inhibitors.

4. Sucrose and proton cotransport in Ricinus cotyledons : II. H(+) efflux and associated K(+) uptake.

5. Inhibition of stomatal opening during uptake of carbohydrates by guard cells in isolated epidermal tissues.

6. Membrane potential changes during transport of hexoses in Lemna gibba G1.

7. Energetics of threonine uptake by pod wall tissues of Vicia faba L.

8. A model for proton and potassium co-transport during the uptake of glutamine and sucrose by tomato internode disks.

9. Symplastic isolation of the sieve element-companion cell complex in the phloem of Ricinus communis and Salix alba stems.

10. Sucrose uptake by cotyledons of Ricinus communis L.: Characteristics, mechanism, and regulation.