Sweet or Sour? Important Link between Nitrate Signaling and Malate Accumulation Identified in Apple.

The organic compound malate has a large impact on the taste of many of our most popular fruits, for example grapes ( Vitis vinifera ), tomatoes ( Solanum lycopersicum ), and in particular apples ( Malus domestica ). The amount of malate in apples determines how tart (sour) or how sweet we perceive