BAI GIANG AI LUC NUOC TRONG CAY (Water potential )

Water potential and water transport in plant Biological Science, 4th edition, pp 717-720 Content • Role of water in plant • Water potential • Calculate water potential • Aquaporin • Plant have big genome size • Plant are the most productivity • CO2 fixing by using water and light energy H2O • Dissolve and transport mineral from roots to H2O leaves or other parts • Moderate the plant surfaces: leaves, stems • Open stomata to up take CO2 for photosynthesis Osmosis system W = Ψs = − RTCi • • • • R: ideal gas constant T: absolute temperature (Kelvin): 273+t C: concentratrion in molarity of the solute i: Van’t Hoff factor (express the ionization level of solution: i= + α*(n-1) α: segregation coefficient n: number of ions that from electrolytic dissociation Pure water: Ψs = MPa Solution of 1M Sucrose, Proline: Ψs = -2.4 MPa Calculate water potential