期刊
PLANT CELL AND ENVIRONMENT
卷 37, 期 1, 页码 153-161出版社
WILEY-BLACKWELL
DOI: 10.1111/pce.12141
关键词
cavitation; forest mortality; hydraulic conductance; non-structural carbohydrates; phloem; xylem
资金
- LANL-LDRD
- Office of Science (BER), US Department of Energy
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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