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Hot drought reduces the effects of elevated CO₂ on tree water use efficiency and carbon metabolism

Birami, Benjamin; Nägele, Thomas; Gattmann, Marielle; Preisler, Yakir; Gast, Andreas; Arneth, Almut; Ruehr, Nadine K.

Abstract:
- Trees are increasingly exposed to hot droughts due to CO2-induced climate change. However, the direct role of [CO2] in altering tree physiological responses to drought and heat stress remains ambiguous.
- Pinus halepensis (Aleppo pine) trees were grown from seed under ambient (421 ppm) or elevated (867 ppm) [CO2]. The 1.5-yr-old trees, either well watered or drought treated for 1 month, were transferred to separate gas-exchange chambers and the temperature gradually increased from 25°C to 40°C over a 10 d period. Continuous whole-tree shoot and root gasexchange measurements were supplemented by primary metabolite analysis.
- Elevated [CO2] reduced tree water loss, reflected in lower stomatal conductance, resulting in a higher water-use efficiency throughout amplifying heat stress. Net carbon uptake declined strongly, driven by increases in respiration peaking earlier in the well-watered (31– 32°C) than drought (33–34°C) treatments unaffected by growth [CO2]. Further, drought altered the primary metabolome, whereas the metabolic response to [CO2] was subtle and mainly reflected in enhanced root protein stability.
- The impact of elevated [CO2] on tree stress responses was modest and largely vanished with progressing heat and drought. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000105619
Veröffentlicht am 29.05.2020
Originalveröffentlichung
DOI: 10.1111/nph.16471
Scopus
Zitationen: 2
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0028-646X
KITopen-ID: 1000105619
HGF-Programm 12.02.02 (POF III, LK 01)
Vegetation climate- and land use system
Erschienen in The new phytologist
Band 226
Heft 6
Seiten 1607-1621
Projektinformation CLiFF (DFG, DFG EIN, SCHM 2736/2-1_II)
Vorab online veröffentlicht am 03.02.2020
Schlagwörter carbon balance, drought, elevated CO2, heat, photosynthesis, primary metabolites, protein, respiration
Nachgewiesen in Scopus
Web of Science
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