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Kruse, J.* ; Adams, M.* ; Winkler, J.B. ; Ghirardo, A. ; Alfarraj, S.* ; Kreuzwieser, J.* ; Hedrich, R.* ; Schnitzler, J.-P. ; Rennenberg, H.*

Optimization of photosynthesis and stomatal conductance in the date palm Phoenix dactylifera during acclimation to heat and drought.

New Phytol. 223, 1973-1988 (2019)
Publ. Version/Full Text Postprint DOI PMC
Open Access Green
We studied acclimation of leaf gas exchange to differing seasonal climate and soil water availability in slow-growing date palm (Phoenix dactylifera) seedlings. We used an extended Arrhenius equation to describe instantaneous temperature responses of leaf net photosynthesis (A) and stomatal conductance (G), and derived physiological parameters suitable for characterization of acclimation (T-opt, A(opt) and T-equ). Optimum temperature of A (T-opt) ranged between 20-33 degrees C in winter and 28-45 degrees C in summer. Growth temperature (T-growth) explained c. 50% of the variation in T-opt, which additionally depended on leaf water status at the time of measurement. During water stress, light-saturated rates of A at T-opt (i.e. A(opt)) were reduced to 30-80% of control levels, albeit not limited by CO2 supply per se. Equilibrium temperature (T-equ), around which A/G and substomatal [CO2] are constant, remained tightly coupled with T-opt. Our results suggest that acclimatory shifts in T-opt and A(opt) reflect a balance between maximization of photosynthesis and minimization of the risk of metabolic perturbations caused by imbalances in cellular [CO2]. This novel perspective on acclimation of leaf gas exchange is compatible with optimization theory, and might help to elucidate other acclimation and growth strategies in species adapted to differing climates.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Acclimation ; Adaptation ; Arrhenius Equation ; Flux Control ; Stomata ; Temperature Response ; Water Use Efficiency (wue); Carbon-isotope Discrimination; Vapor-pressure Deficit; Temperature Response; Electron-transport; Internal Conductance; Eucalyptus-globulus; Thermal-acclimation; Interspecific Variation; Growth Temperature; Co2 Assimilation
ISSN (print) / ISBN 0028-646X
e-ISSN 1469-8137
Journal New Phytologist
Quellenangaben Volume: 223, Issue: 4, Pages: 1973-1988 Article Number: , Supplement: ,
Publisher Wiley
Publishing Place 111 River St, Hoboken 07030-5774, Nj Usa
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Research Unit Environmental Simulation (BIOP-EUS)