Outside-Xylem Vulnerability, Not Xylem Embolism, Controls Leaf Hydraulic Decline during Dehydration

2017/01/03 by Christine Scoffoni, Caetano Albuquerque, Craig R. Brodersen +6 · 11 citations
Environmental Science · Agricultural and Biological Sciences · Earth and Planetary Sciences · #Plant Water Relations and Carbon Dynamics #Plant responses to water stress #Tree-ring climate responses

paper · pdf · doi:10.1104/pp.16.01643

Abstract

decline across the range of dehydration from mild water stress to beyond turgor loss point. Spatially explicit modeling of leaf water transport pointed to a role for reduced membrane conductivity consistent with published data for cells and tissues. Plant-scale modeling suggested that outside-xylem hydraulic vulnerability can protect the xylem from tensions that would induce embolism and disruption of water transport under mild to moderate soil and atmospheric droughts. These findings pinpoint outside-xylem tissues as a central locus for the control of leaf and plant water transport during progressive drought.

Citations

• How Does Leaf Anatomy Influence Water Transport outside the Xylem?
• Xylem Cavitation in the Leaf of <i>Prunus laurocerasus</i>and Its Impact on Leaf Hydraulics
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