Loss of two families of SPX domain-containing proteins required for vacuolar polyphosphate accumulation coincides with the transition to phosphate storage in green plants

Phosphorus is an essential nutrient for plants. It is stored as inorganic phosphate (Pi) in the vacuoles of land plants but as inorganic polyphosphate (polyP) in chlorophyte algae. Although it is recognized that the SPX-Major Facilitator Superfamily (MFS) and VPE proteins are responsible for Pi infl...

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