Journal
PLANT CELL AND ENVIRONMENT
Volume 37, Issue 1, Pages 153-161Publisher
WILEY-BLACKWELL
DOI: 10.1111/pce.12141
Keywords
cavitation; forest mortality; hydraulic conductance; non-structural carbohydrates; phloem; xylem
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Funding
- LANL-LDRD
- Office of Science (BER), US Department of Energy
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Despite decades of research on plant drought tolerance, the physiological mechanisms by which trees succumb to drought are still under debate. We report results from an experiment designed to separate and test the current leading hypotheses of tree mortality. We show that pinon pine (Pinus edulis) trees can die of both hydraulic failure and carbon starvation, and that during drought, the loss of conductivity and carbohydrate reserves can also co-occur. Hydraulic constraints on plant carbohydrate use determined survival time: turgor loss in the phloem limited access to carbohydrate reserves, but hydraulic control of respiration prolonged survival. Our data also demonstrate that hydraulic failure may be associated with loss of adequate tissue carbohydrate content required for osmoregulation, which then promotes failure to maintain hydraulic integrity.
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