How do trees die? A test of the hydraulic failure and carbon starvation hypotheses.
Plant Cell Environ
; 37(1): 153-61, 2014 Jan.
Article
em En
| MEDLINE
| ID: mdl-23730972
ABSTRACT
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 piñon 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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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Carbono
/
Transpiração Vegetal
/
Pinus
Idioma:
En
Revista:
Plant Cell Environ
Ano de publicação:
2014
Tipo de documento:
Article