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Overview of the evolution of Na+ and H+ transporting P-type ATPases in Viridiplantae. Most likely, the ancestor of green plants had two types of Na+ pumps (P2C and P2D) in addition to a plasma membrane H+ pump (P3A). In present day plants, the terrestrial green algae C. reinhardtii still has all three types of pumps whereas Na+ pumps have been lost completely in vascular plants (here represented by Lycopodiophyta and Spermatophyta).
