Abstract
Leaf dehydration decreases water potential and cell turgor pressure. Therefore, changes in cell turgor pressure may regulate water transport across plant cell membranes. Using a cell pressure probe, the hydraulic properties of parenchyma cells in the midrib of maize (Zea mays L.) leaves were measured (half time of water exchange in cells as a measure of hydraulic conductivity Lp). Using intact plants with root systems encased in a pressure chamber, the root systems were pressurized and the turgor pressure in leaf cells increased by increments up to 0.3 MPa. However, the increase in the cell turgor did not increase but stabilized values. Increased water potential in leaf cells seemed to have stabilizing effects on the probably due to enhanced water availability. When the cell turgor decreased by 0.1 MPa to 0.3 MPa with releasing the pressure in the pressure chamber, was temporarily increased to a large degree, a factor of up to 13 within 30 min.
Highlights
Plant leaves experience various ranges of water potential in response to the changes in transpiration rate or soil water content
When a certain level of pressure was applied to the root system, the cell turgor pressure increased with the ratio of 1:1 (Figures 1 and 2)
We observed that the pressurized root system increased the leaf cell turgor pressure and it rather stabilized leaf cell hydraulic conductivity (Lp)
Summary
Plant leaves experience various ranges of water potential in response to the changes in transpiration rate or soil water content. In response to such changes, plants need to adjust their ability to conduct water through leaves, the leaf hydraulic conductance [1]. One of the possible causes for the Kleaf decline with dehydration is the outside-xylem hydraulic conductance, which includes the cell hydraulic conductivity, Lp [5,6,7,8]. The cell Lp could decline in response to the decrease of the cell turgor pressure by leaf dehydration [3,9]. In a long-term response, the de novo
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