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231225s2003 xx |||||o 00| ||eng c |
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|a 10.1046/j.1469-8137.2003.00650.x
|2 doi
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|a eng
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|a Viktor, A
|e verfasserin
|4 aut
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|a Variation in root-zone CO2 concentration modifies isotopic fractionation of carbon and nitrogen in tomato seedlings
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|c 2003
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 20.04.2021
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a • The contribution to the carbon budget and growth by root acquisition of inorganic carbon and the influence that this has on NO 3 - and NH 4 + uptake and assimilation has not been adequately quantified. • The influence of varying root-zone CO 2 concentrations on tissue δ 13 C and δ 15 N was used to estimate the contribution to the carbon budget of root-assimilated carbon in tomato ( Lycopersicon esculentum ) seedlings. • Biomass accumulation was greater at 0.5% and 1% (v/v) root-zone CO 2 in NO 3 - and NH 4 + -fed plants than with 0% root-zone CO 2 . The plant δ 13 C values were not altered by 1% CO 2 with δ 13 C = -29.00‰, but they were increased when supplied with 1% CO 2 with δ 13 C = -10.91‰. The δ 15 N values of NO 3 - -fed plants were unchanged by variation in root-zone CO 2 concentration. In NH 4 + -fed plants the δ 15 N values were c. 1.5‰ higher at 1% CO 2 . • Changes in δ 13 C values with increased CO 2 concentration (δ 13 C = -10.91‰) were ascribed to root incorporation of CO 2 . Less than 5% of carbon was derived from root dark fixation and thus cannot explain increases in growth on a mass basis. Reduced discrimination with NH 4 + nutrition at 1% CO 2 could be related to increased exudation of NH 4 + and organic nitrogen and also reduced uptake
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|a Journal Article
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|a Lycopersicon esculentum (tomato)
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|a anaplerotic
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|a discrimination
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|a isotope
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|a phosphoenolpyruvate carboxylase
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|a δ13C
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|a δ15N
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|a Cramer, M D
|e verfasserin
|4 aut
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|i Enthalten in
|t The New phytologist
|d 1979
|g 157(2003), 1 vom: 25. Jan., Seite 45-54
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnas
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| 773 |
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|g volume:157
|g year:2003
|g number:1
|g day:25
|g month:01
|g pages:45-54
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