Initial hydraulic failure followed by late-stage carbon starvation leads to drought-induced death in the tree
Journal
Communications biology
ISSN: 2399-3642
Titre abrégé: Commun Biol
Pays: England
ID NLM: 101719179
Informations de publication
Date de publication:
2019
2019
Historique:
received:
10
07
2018
accepted:
07
12
2018
entrez:
10
1
2019
pubmed:
10
1
2019
medline:
10
1
2019
Statut:
epublish
Résumé
Drought-induced tree death has become a serious problem in global forest ecosystems. Two nonexclusive hypotheses, hydraulic failure and carbon starvation, have been proposed to explain tree die-offs. To clarify the mechanisms, we investigated the physiological processes of drought-induced tree death in saplings with contrasting Huber values (sapwood area/total leaf area). First, hydraulic failure and reduced respiration were found in the initial process of tree decline, and in the last stage carbon starvation led to tree death. The carbohydrate reserves at the stem bases, low in healthy trees, accumulated at the beginning of the declining process due to phloem transport failure, and then decreased just before dying. The concentrations of non-structural carbohydrates at the stem bases are a good indicator of tree damage. The physiological processes and carbon sink-source dynamics that occur during lethal drought provide important insights into the adaptive measures underlying forest die-offs under global warming conditions.
Identifiants
pubmed: 30623104
doi: 10.1038/s42003-018-0256-7
pii: 256
pmc: PMC6323055
doi:
Substances chimiques
Water
059QF0KO0R
Carbon
7440-44-0
Banques de données
Dryad
['10.5061/dryad.8j60c45']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Pagination
8Déclaration de conflit d'intérêts
The authors declare no competing interests.
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