K regulate the stoma open and close Radially Potassium K CI oriented cellulose K+ CI Phosphoru m0如 Note different scales for Potassium and for 二929058 Guard Guard cells ells Guard cells become go limp turgid Stoma closed Stoma open Stoma closed aN4 lon contents of guard cells with closed and open stomata(after HUMBLE and RASCHKE [197ID
K regulate the stoma open and close
Function of potassium in plants b)Cell turgor 1) The term "turgid" is used to describe plant cells that are full of water. This helps plants stand upright, even without the woody tissues that trees have (2) Special cells(called guard cells)in the leaf control the size of the stomatal opening that allows co to move into the leaf and water to move out (transpiration). The amount of K+ in these guard ells controls their opening and closing c) Water uptake by roots
Function of potassium in plants b) Cell turgor (1) The term “turgid” is used to describe plant cells that are full of water. This helps plants stand upright, even without the woody tissues that trees have. (2) Special cells (called guard cells) in the leaf control the size of the stomatal opening that allows CO2 to move into the leaf and water to move out (transpiration). The amount of K+ in these guard ells controls their opening and closing. c) Water uptake by roots
Function of potassium in plants 3. Meristematic growth a)Ht is pumped into the apoplast (outside the cell wall). The H+ weakens the cell wall allowing for expansion. In order for H+ to be pumped out of the cell, K+ must be pumped in
3. Meristematic growth a) H+ is pumped into the apoplast (outside the cell wall). The H+ weakens the cell wall allowing for expansion. In order for H+ to be pumped out of the cell, K+ must be pumped in. Function of potassium in plants
Function of potassium in plants 4, and stress resistance a)Drought tolerance (1) Through control of both water loss throughtranspiration and water absorption by roots b winter hardiness c) Fungal disease resistance(powdery mildew H 粉病, brown spot(褐斑病), brown rust褐锈病) d)Tolerance to insect feeding e)Reduced stalk rot and lodging Stronger stems
Function of potassium in plants 4. K and stress resistance a) Drought tolerance (1) Through control of both water loss throughtranspiration and water absorption by roots b) Winter hardiness c) Fungal disease resistance (powdery mildew白 粉病，brown spot（褐斑病）, brown rust褐锈病） d) Tolerance to insect feeding e) Reduced stalk rot and lodging Stronger stems
NPK +K N K