Evidence for a plasma membrane proton pump in phloem cells of higher plants.

@article{Dewitt1991EvidenceFA,
  title={Evidence for a plasma membrane proton pump in phloem cells of higher plants.},
  author={N D Dewitt and Jeffrey F. Harper and Michael R. Sussman},
  journal={The Plant journal : for cell and molecular biology},
  year={1991},
  volume={1 1},
  pages={121-8}
}
Metabolic energy is required for the loading of sucrose into the phloem and translocation of sugars throughout the plant. The proton electrochemical gradient generated by a plasma membrane proton pump (H(+)-ATPase) is thought to provide energy for these processes. The plasma membrane H(+)-ATPase is encoded by a multigene family in Arabidopsis thaliana. Here we characterize the expression of isoform AHA3 (Arabidopsis H(+)-ATPase isoform 3). The AHA3 mRNA start site was mapped and 464 bp of the… CONTINUE READING
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