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Beyond the extreme: recovery of carbon and water relations in woody plants following heat and drought stress

Ruehr, Nadine K.; Grote, Rüdiger; Mayr, Stefan; Arneth, Almut

Abstract (englisch):
Plant responses to drought and heat stress have been extensively studied, whereas post-stress recovery, which is fundamental to understanding stress resilience, has received much less attention. Here, we present a conceptual stress-recovery framework with respect to hydraulic and metabolic functioning in woody plants. We further synthesize results from controlled experimental studies following heat or drought events and highlight underlying mechanisms that drive post-stress recovery. We find that the pace of recovery differs among physiological processes. Leaf water potential and abscisic acid concentration typically recover within few days upon rewetting, while leaf gas exchange-related variables lag behind. Under increased drought severity as indicated by a loss in xylem hydraulic conductance, the time for stomatal conductance recovery increases markedly. Following heat stress release, a similar delay in leaf gas exchange recovery has been observed, but the reasons are most likely a slow reversal of photosynthetic impairment and other temperature-related leaf damages, which typically manifest at temperatures above 40 °C. Based thereon, we suggest that recovery of gas exchange is fast following mild stress, while recovery is slow and reliant on the efficiency of repair and regrowth when stress results in functional impairment and damage to critical plant processes. ... mehr

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Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1758-4469
KITopen-ID: 1000098199
Erschienen in Tree physiology
Band 39
Heft 8
Seiten 1285–1299
Vorab online veröffentlicht am 17.05.2019
Schlagworte carbon allocation, hydraulic conductance, non-structural carbohydrates, post-drought, post-heat, recovery, stress legacy, trees, xylem embolism
Nachgewiesen in Web of Science
Scopus
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