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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1111/nph.16733
|2 doi
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|a pubmed24n1036.xml
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|a (DE-627)NLM311109330
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|a (NLM)32531796
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Drake, John E
|e verfasserin
|4 aut
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| 245 |
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|a No evidence of homeostatic regulation of leaf temperature in Eucalyptus parramattensis trees
|b integration of CO2 flux and oxygen isotope methodologies
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 26.04.2021
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|a Date Revised 26.04.2021
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|a published: Print-Electronic
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|a CommentIn: New Phytol. 2020 Dec;228(5):1455-1457. - PMID 33011978
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|a Citation Status MEDLINE
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|a © 2020 The Authors. New Phytologist © 2020 New Phytologist Foundation.
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|a Thermoregulation of leaf temperature (Tleaf ) may foster metabolic homeostasis in plants, but the degree to which Tleaf is moderated, and under what environmental contexts, is a topic of debate. Isotopic studies inferred the temperature of photosynthetic carbon assimilation to be a constant value of c. 20°C; by contrast, leaf biophysical theory suggests a strong dependence of Tleaf on environmental drivers. Can this apparent disparity be reconciled? We continuously measured Tleaf and whole-crown net CO2 uptake for Eucalyptus parramattensis trees growing in field conditions in whole-tree chambers under ambient and +3°C warming conditions, and calculated assimilation-weighted leaf temperature (TL-AW ) across 265 d, varying in air temperature (Tair ) from -1 to 45°C. We compared these data to TL-AW derived from wood cellulose δ18 O. Tleaf exhibited substantial variation driven by Tair , light intensity, and vapor pressure deficit, and Tleaf was strongly linearly correlated with Tair with a slope of c. 1.0. TL-AW values calculated from cellulose δ18 O vs crown fluxes were remarkably consistent; both varied seasonally and in response to the warming treatment, tracking variation in Tair . The leaves studied here were nearly poikilothermic, with no evidence of thermoregulation of Tleaf towards a homeostatic value. Importantly, this work supports the use of cellulose δ18 O to infer TL-AW , but does not support the concept of strong homeothermic regulation of Tleaf
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Eucalyptus parramattensis
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|a carbon cycle
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|a climate warming
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| 650 |
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|a endothermy
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| 650 |
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|a photosynthesis
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| 650 |
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|a temperature regulation
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| 650 |
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|a Oxygen Isotopes
|2 NLM
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| 650 |
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|a Carbon Dioxide
|2 NLM
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| 650 |
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|a 142M471B3J
|2 NLM
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| 700 |
1 |
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|a Harwood, Richard
|e verfasserin
|4 aut
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| 700 |
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|a Vårhammar, Angelica
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Barbour, Margaret M
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Reich, Peter B
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Barton, Craig V M
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tjoelker, Mark G
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 228(2020), 5 vom: 21. Dez., Seite 1511-1523
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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| 773 |
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|g volume:228
|g year:2020
|g number:5
|g day:21
|g month:12
|g pages:1511-1523
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|u http://dx.doi.org/10.1111/nph.16733
|3 Volltext
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