A new empirical framework to quantify the hydraulic effects of soil and atmospheric drivers on plant water status.
homoiohydry
isohydry
soil drought
vapour pressure deficit
water status regulation
Journal
Global change biology
ISSN: 1365-2486
Titre abrégé: Glob Chang Biol
Pays: England
ID NLM: 9888746
Informations de publication
Date de publication:
Mar 2024
Mar 2024
Historique:
revised:
12
02
2024
received:
06
12
2023
accepted:
12
02
2024
medline:
7
3
2024
pubmed:
7
3
2024
entrez:
7
3
2024
Statut:
ppublish
Résumé
Metrics to quantify regulation of plant water status at the daily as opposed to the seasonal scale do not presently exist. This gap is significant since plants are hypothesised to regulate their water potential not only with respect to slowly changing soil drought but also with respect to faster changes in air vapour pressure deficit (VPD), a variable whose importance for plant physiology is expected to grow because of higher temperatures in the coming decades. We present a metric, the stringency of water potential regulation, that can be employed at the daily scale and quantifies the effects exerted on plants by the separate and combined effect of soil and atmospheric drought. We test our theory using datasets from two experiments where air temperature and VPD were experimentally manipulated. In contrast to existing metrics based on soil drought that can only be applied at the seasonal scale, our metric successfully detects the impact of atmospheric warming on the regulation of plant water status. We show that the thermodynamic effect of VPD on plant water status can be isolated and compared against that exerted by soil drought and the covariation between VPD and soil drought. Furthermore, in three of three cases, VPD accounted for more than 5 MPa of potential effect on leaf water potential. We explore the significance of our findings in the context of potential future applications of this metric from plant to ecosystem scale.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e17222Subventions
Organisme : Spanish National Plan for Scientific and Technical Research and Innovation
ID : PID2022-137270NB-I00
Organisme : Spanish National Plan for Scientific and Technical Research and Innovation
ID : PRE2018-086096
Organisme : Horizon 2020 Framework Programme
ID : 862221
Organisme : Natural Sciences and Engineering Research Council of Canada
Organisme : Alfred P. Sloan Foundation
Informations de copyright
© 2024 John Wiley & Sons Ltd.
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