2003
DOI: 10.1104/pp.015156
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Exploring Symbiotic Nitrogen Fixation and Assimilation in Pea Root Nodules by in Vivo 15N Nuclear Magnetic Resonance Spectroscopy and Liquid Chromatography-Mass Spectrometry

Abstract: Nitrogen (N) fixation and assimilation in pea (Pisum sativum) root nodules were studied by in vivo 15 N nuclear magnetic resonance (NMR) by exposing detached nodules to 15 N 2 via a perfusion medium, while recording a time course of spectra. In vivo 31 P NMR spectroscopy was used to monitor the physiological state of the metabolically active nodules. The nodules were extracted after the NMR studies and analyzed for total soluble amino acid pools and 15 N labeling of individual amino acids by liquid chromatogra… Show more

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Cited by 37 publications
(34 citation statements)
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“…15 N nuclear magnetic resonance analysis on detached pea nodules showed GABA to be the second most abundant amino acid (37). This is consistent with an important role for GABA in bacteroid metabolism and a possible role in amino acid cycling.…”
supporting
confidence: 59%
See 1 more Smart Citation
“…15 N nuclear magnetic resonance analysis on detached pea nodules showed GABA to be the second most abundant amino acid (37). This is consistent with an important role for GABA in bacteroid metabolism and a possible role in amino acid cycling.…”
supporting
confidence: 59%
“…The cytosolic concentration of GABA from soybean nodules was measured as 71 g g Ϫ1 (fresh weight), while nuclear magnetic resonance analysis of pea nodules revealed a GABA concentration of 5.72 mol g Ϫ1 (fresh weight) (37,38). High GABA concentrations have also been reported in isolated bacteroids of S. meliloti (41 nmol mg of protein Ϫ1 ) (27), suggesting it has an important role in bacteroid metabolism.…”
Section: Discussionmentioning
confidence: 99%
“…viciae 3841 bacteroids was low, the high APE suggests that it turns over rapidly and therefore may play an important role in amino acid metabolism or amino acid cycling (26). It was also reported to be the most highly 15 N-labeled amino acid in pea nodules in a previous study (41), but in that study bacteroids and plant cytosol were not separated. GABA is most likely derived from the glutamate pool of the plant cytosol via ␣-decarboxylation by glutamate decarboxylase (Fig.…”
Section: Resultsmentioning
confidence: 77%
“…5,12,20 By the aid of 15 N nuclear magnetic resonance ( 15 N NMR), GABA was determined as the second most abundant amino acid of detached pea nodules. 29 High [GABA] have been reported in bacteroids isolated from different bacterial strains including Bradyrhizobium japonicum, 30 Sinorhizobium meliloti 31 and Rhizobium leguminosarum.…”
Section: Role Of Gaba In Nodule Functioningmentioning
confidence: 99%