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|a 10.1093/jxb/eraf118
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|a eng
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|a Perkowski, Evan A
|e verfasserin
|4 aut
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| 245 |
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|a Nitrogen demand, availability, and acquisition strategy control plant responses to elevated CO2
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|c 2025
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Revised 17.03.2025
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|a published: Print-Electronic
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|a Citation Status Publisher
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|a © The Author(s) 2025. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For commercial re-use, please contact reprintsoup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.
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|a Plants respond to increasing atmospheric CO2 concentrations by reducing leaf nitrogen content and photosynthetic capacity - patterns that correspond with increased net photosynthesis and growth. Despite the longstanding notion that nitrogen availability regulates these responses, eco-evolutionary optimality theory posits that leaf-level responses to elevated CO2 are driven by leaf nitrogen demand for building and maintaining photosynthetic enzymes and are independent of nitrogen availability. In this study, we examined leaf and whole-plant responses of Glycine max L. (Merr) subjected to full-factorial combinations of two CO2, two inoculation, and nine nitrogen fertilization treatments. Nitrogen fertilization and inoculation did not alter leaf photosynthetic responses to elevated CO2. Instead, elevated CO2 decreased the maximum rate of Rubisco carboxylation more strongly than it decreased the maximum rate of electron transport for RuBP regeneration, increasing net photosynthesis by allowing rate-limiting steps to approach optimal coordination. Increasing fertilization enhanced positive whole-plant responses to elevated CO2 due to increased belowground carbon allocation and nitrogen uptake. Inoculation with nitrogen-fixing bacteria did not influence plant responses to elevated CO2. These results reconcile the role of nitrogen availability on plant responses to elevated CO2, showing that leaf photosynthetic responses are regulated by leaf nitrogen demand while whole-plant responses are constrained by nitrogen availability
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|a Journal Article
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|a acclimation
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| 650 |
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|a biomass
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| 650 |
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4 |
|a eco-evolutionary optimality
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| 650 |
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|a growth chamber
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| 650 |
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4 |
|a least-cost theory
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| 650 |
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|a optimal coordination
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| 650 |
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4 |
|a photosynthesis
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| 650 |
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4 |
|a plant functional ecology
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| 650 |
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4 |
|a resource optimization
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| 700 |
1 |
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|a Ezekannagha, Ezinwanne
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Smith, Nicholas G
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g (2025) vom: 17. März
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnas
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| 773 |
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|g year:2025
|g day:17
|g month:03
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|u http://dx.doi.org/10.1093/jxb/eraf118
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