| Comments |
P.489 left column: "In opening the pore, guard cells accumulate solute, mainly K+ salts with Cl− and malate (Mal), as well as sugars. In closing the pore, guard cells reverse this process by metabolizing these solutes or releasing them to the apoplast. The changes in solute content between the open and closed states are substantial, often exceeding 300 to 400 mosmol/L (= 300–400 mosM) on a cell volume basis (Table II), and draw corresponding water fluxes, thereby driving the volume and turgor changes that open and close the pore." P.508 right column top paragraph: "As a case in point, during stomatal opening, the solute content of a typical V. faba or Arabidopsis guard cell rises by approximately 200 to 300 mm on a cell volume basis, roughly half of this K+ (Table II)." |