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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1111/j.1469-8137.2012.04366.x
|2 doi
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|a eng
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|a Bloemen, Jasper
|e verfasserin
|4 aut
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|a Transport of root-respired CO₂ via the transpiration stream affects aboveground carbon assimilation and CO₂ efflux in trees
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|c 2013
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|a Text
|b txt
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 21.05.2013
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|a Date Revised 20.04.2021
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|a published: Print-Electronic
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|a CommentIn: New Phytol. 2013 Jan;197(2):353-5. - PMID 23253327
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|a Citation Status MEDLINE
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|a © 2012 The Authors. New Phytologist © 2012 New Phytologist Trust.
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|a Upward transport of CO₂ via the transpiration stream from belowground to aboveground tissues occurs in tree stems. Despite potentially important implications for our understanding of plant physiology, the fate of internally transported CO₂ derived from autotrophic respiratory processes remains unclear. We infused a ¹³CO₂-labeled aqueous solution into the base of 7-yr-old field-grown eastern cottonwood (Populus deltoides) trees to investigate the effect of xylem-transported CO₂ derived from the root system on aboveground carbon assimilation and CO₂ efflux. The ¹³C label was transported internally and detected throughout the tree. Up to 17% of the infused label was assimilated, while the remainder diffused to the atmosphere via stem and branch efflux. The largest amount of assimilated ¹³C was found in branch woody tissues, while only a small quantity was assimilated in the foliage. Petioles were more highly enriched in ¹³C than other leaf tissues. Our results confirm a recycling pathway for respired CO₂ and indicate that internal transport of CO₂ from the root system may confound the interpretation of efflux-based estimates of woody tissue respiration and patterns of carbohydrate allocation
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Carbon Isotopes
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|a McGuire, Mary Anne
|e verfasserin
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|a Aubrey, Doug P
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|a Teskey, Robert O
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|a Steppe, Kathy
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|i Enthalten in
|t The New phytologist
|d 1979
|g 197(2013), 2 vom: 11. Jan., Seite 555-565
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|x 1469-8137
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