Dynamic soil hydraulic resistance regulates stomata.
drought
embolism
plant hydraulics
rhizosphere
roots
stomata
transpiration
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
02 Aug 2024
02 Aug 2024
Historique:
received:
06
06
2024
accepted:
05
07
2024
medline:
3
8
2024
pubmed:
3
8
2024
entrez:
3
8
2024
Statut:
aheadofprint
Résumé
The onset of stomatal closure reduces transpiration during drought. In seed plants, drought causes declines in plant water status which increases leaf endogenous abscisic acid (ABA) levels required for stomatal closure. There are multiple possible points of increased belowground resistance in the soil-plant atmospheric continuum that could decrease leaf water potential enough to trigger ABA production and the subsequent decreases in transpiration. We investigate the dynamic patterns of leaf ABA levels, plant hydraulic conductance and the point of failure in the soil-plant conductance in the highly embolism-resistant species Callitris tuberculata using continuous dendrometer measurements of leaf water potential during drought. We show that decreases in transpiration and ABA biosynthesis begin before any permanent decreases in predawn water potential, collapse in soil-plant hydraulic pathway and xylem embolism spread. We find that a dynamic but recoverable increases in hydraulic resistance in the soil in close proximity to the roots is the most likely driver of declines in midday leaf water potential needed for ABA biosynthesis and the onset of decreases in transpiration.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Division of Integrative Organismal Systems
ID : 2140119
Organisme : Ministerio de Ciencia e Innovación
ID : PRE2019-090354
Organisme : National Institute of Food and Agriculture
ID : 1014908
Informations de copyright
© 2024 The Author(s). New Phytologist © 2024 New Phytologist Foundation.
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