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• W2120592213 startingPage "285" @default.
• W2120592213 abstract "Sucrose synthase (SS) activity has been suggested to be a key point of regulation in nodule metabolism since this enzyme is down‐regulated in response to different stresses which lead to decreased nitrogen fixation. In soybean, a dramatic decline of SS transcripts has been observed within 1 d from the onset of drought. Such a quick response suggests mediation by a signal transduction molecule. Abscisic acid (ABA) is a likely candidate to act as such a molecule as it mediates in a significant number of plant responses to environmental constraints. The hypothesis of ABA controlling nodule metabolism was approached in this work by assessing nodule responses to exogenous ABA supply in pea. Under the experimental conditions, ABA did not affect plant biomass, nodule numbers or dry weight. However, nitrogen fixation rate was reduced by 70% within 5 d and by 80% after 9 d leading to a reduced plant organic nitrogen content. Leghaemoglobin (Lb) content declined in parallel with that of nitrogen fixation. SS activity, however, was not affected by ABA treatment, and neither were the activities of the enzymes aspartate amino transferase, alkaline invertase, malate dehydrogenase, glutamate synthase, uridine diphosphoglucose pyrophosphorylase, isocitrate dehydrogenase, and glutamine synthetase. Nodule bacteroid‐soluble protein content was reduced in nodules only after 9 d of ABA treatment. These results do not support the hypothesis that ABA directly regulates SS activity. However, they do suggest the occurrence of at least two different control pathways in nodules under environmental constraints, which include ABA being involved in a Lb/oxygen‐related control of nitrogen fixation." @default.
• W2120592213 created "2016-06-24" @default.
• W2120592213 creator A5000841489 @default.
• W2120592213 creator A5002743160 @default.
• W2120592213 creator A5038366588 @default.
• W2120592213 date "2001-02-01" @default.
• W2120592213 modified "2023-10-18" @default.
• W2120592213 title "Abscisic acid induces a decline in nitrogen fixation that involves leghaemoglobin, but is independent of sucrose synthase activity" @default.
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• W2120592213 doi "https://doi.org/10.1093/jexbot/52.355.285" @default.
• W2120592213 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11283173" @default.
• W2120592213 hasPublicationYear "2001" @default.
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