Is sodium proton antiport ubiquitous in plant cells?
Journal of Plant PhysiologyPublished 1 December 1990
Hartwig Mennen, B. Jacoby, H. Marschner
Citations62
SJR quartileQ1
SJR score1.11
SNIP1.06
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TL;DR
It was concluded that the presence of a Na + /H + antiporter is not an ubiquitous characteristic of plant cells and its functioning at the plasma membrane and tonoplast of their cells was concluded.
Abstract
Excised roots or storage tissue slices from 16 crop plant species were screened for the presence of a Na+/H+ antiporter at the plasma membrane and tonoplast of their cells. The pH-gradient dependent decrease of Na+ uptake by ATP-depleted tissues served as an indication for such antiport at the plasma membrane. Metabolic-energy dependent uptake by the tissues, in the presence of excess K+, indicated the functioning of Na+/H+ antiport at the tonoplast. Evidence for Na+/H+ antiport was found in four species and for its absence in five species. In seven species the evidence was not unequivocal. It was concluded that the presence of a Na+/H+ antiporter is not an ubiquitous characteristic of plant cells.
Keywords
Agricultural and Biological Sciences
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