Pacific Northwest Research Station

Title: Hydraulic patterns and safety margins, from stem to stomata, in three eastern US tree species

Author: Johnson, D.M.; McCulloh, K.A.; Meinzer, F.C.; Woodruff, D.R.; Eissenstat, D.M.

Date: 2011

Source: Tree Physiology. 31: 659-668

Description: Adequate water transport is necessary to prevent stomatal closure and allow for photosynthesis. Dysfunction in the water transport pathway can result in stomatal closure, and can be deleterious to overall plant health and survival. Although much is known about small branch hydraulics, little is known about the coordination of leaf and stem hydraulic function. Additionally, the daily variations in leaf hydraulic conductance, stomatal conductance and water potential have only been measured for a few species. The objective of the current study was to characterize stem and leaf vulnerability to hydraulic dysfunction for three eastern US tree species (Acer rubrum, Liriodendron tulipifera and Pinus virginiana) and to measure in situ daily patterns of leaf hydraulic conductance and stem water potential, and stomatal conductance in the field.

Keywords: cavitation, embolism, photosynthesis, transpiration, xylem

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Citation

Johnson, D.M.; McCulloh, K.A.; Meinzer, F.C.; Woodruff, D.R.; Eissenstat, D.M.  2011.  Hydraulic patterns and safety margins, from stem to stomata, in three eastern US tree species.   Tree Physiology. 31: 659-668.