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•SOS1 is an Na+/H+ antiporter that plays a central role in Na+ tolerance in land plants. SOS1 mediation of Na+ efflux has been studied in plasma‐membrane vesicles and deduced from the SOS1 suppression of the Na+ sensitivity of yeast mutants defective in Na+‐efflux. However, SOS1‐mediated Na+ efflux has not been characterized in either plant or yeast cells. Here, we use Physcomitrella patens to investigate...
Potassium or Na+ efflux ATPases, ENA ATPases, are present in all fungi and play a central role in Na+ efflux and Na+ tolerance. Flowering plants lack ENA ATPases but two ENA ATPases have been identified in the moss Physcomitrella patens, PpENA1 and PpENA2. PpENA1 mediates Na+ efflux in Saccharomyces cerevisiae. To propose a general function of ENA ATPases in bryophytes it was necessary to demonstrate...
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