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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/ert122
|2 doi
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|a pubmed25n0758.xml
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|a (DE-627)NLM227574389
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|a (NLM)23682114
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Sulieman, Saad
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Growth and nodulation of symbiotic Medicago truncatula at different levels of phosphorus availability
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| 264 |
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|c 2013
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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
|b cr
|2 rdacarrier
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|a Date Completed 21.01.2014
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|a Date Revised 22.03.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Medicago truncatula is an important model plant for characterization of P deficiency on leguminous plants at the physiological and molecular levels. Growth optimization of this plant with regard to P supply is the first essential step for elucidation of the role of P in regulation of nodulation. Hence, a study was carried out to address the growth pattern of M. truncatula hydroponically grown at different gradual increases in P levels. The findings revealed that M. truncatula had a narrow P regime, with an optimum P level (12 μM P) which is relatively close to the concentration that induces P toxicity. The accumulated P concentration (2.7 mg g(-1) dry matter), which is normal for other crops and legumes, adversely affected the growth of M. truncatula plants. Under P deficiency, M. truncatula showed a higher symbiotic efficiency with Sinorhizobium meliloti 2011 in comparison with S. meliloti 102F51, partially as a result of higher electron allocation to N2 versus H(+). The total composition of free amino acids in the phloem was significantly affected by P deprivation. This pattern was found to be almost exclusively the result of the increase in the asparagine level, suggesting that asparagine might be the shoot-derived signal that translocates to the nodules and exerts the down-regulation of nitrogenase activity. Additionally, P deprivation was found to have a strong influence on the contents of the nodule carbon metabolites. While levels of sucrose and succinate tended to decrease, a higher accumulation of malate was observed. These findings have provided evidence that N2 fixation of M. truncatula is mediated through an N feedback mechanism which is closely related to nodule carbon metabolism
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Asparagine
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|a Medicago truncatula
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|a carbon and nitrogen metabolites
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|a feedback
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|a nitrogen fixation
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|a nitrogenase activity
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|a nodulation
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|a phloem
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| 650 |
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|a phosphorus availability
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| 650 |
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4 |
|a plant growth
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| 650 |
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|a symbiosis capacity
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| 650 |
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|a translocation.
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| 650 |
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|a Phosphorus
|2 NLM
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| 650 |
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|a 27YLU75U4W
|2 NLM
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| 700 |
1 |
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|a Ha, Chien Van
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Schulze, Joachim
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tran, Lam-Son Phan
|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 64(2013), 10 vom: 15. Juli, Seite 2701-12
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnas
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| 773 |
1 |
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|g volume:64
|g year:2013
|g number:10
|g day:15
|g month:07
|g pages:2701-12
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|u http://dx.doi.org/10.1093/jxb/ert122
|3 Volltext
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