Unpacking the point of no return under drought in poplar insight from stem diameter variation

Unpacking the point of no return under drought in poplar : insight from stem diameter variation

© 2024 The Authors New Phytologist © 2024 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 242(2024), 2 vom: 20. März, Seite 466-478
1. Verfasser: Andriantelomanana, Tsiky (VerfasserIn)
Weitere Verfasser: Améglio, Thierry, Delzon, Sylvain, Cochard, Hervé, Herbette, Stephane
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article acclimation drought point of no return poplar stem diameter tree mortality Water 059QF0KO0R
Beschreibung
Zusammenfassung:© 2024 The Authors New Phytologist © 2024 New Phytologist Foundation.
A specific, robust threshold for drought-induced tree mortality is needed to improve the prediction of forest dieback. Here, we tested the relevance of continuous measurements of stem diameter variations for identifying such a threshold, their relationship with hydraulic and cellular damage mechanisms, and the influence of growth conditions on these relationships. Poplar saplings were grown under well-watered, water-limited, or light-limited conditions and then submitted to a drought followed by rewatering. Stem diameter was continuously measured to investigate two parameters: the percentage loss of diameter (PLD) and the percentage of diameter recovery (DR) following rewatering. Water potentials, stomatal conductance, embolism, and electrolyte leakage were also measured, and light microscopy allowed investigating cell collapse induced by drought. The water release observed through loss of diameter occurred throughout the drought, regardless of growth conditions. Poplars did not recover from drought when PLD reached a threshold and this differed according to growth conditions but remained linked to cell resistance to damage and collapse. Our findings shed new light on the mechanisms of drought-induced tree mortality and indicate that PLD could be a relevant indicator of drought-induced tree mortality, regardless of the growth conditions
Beschreibung:Date Completed 22.03.2024
Date Revised 22.03.2024
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.19615