| Metabolism of gamma-aminobutyric acid during cold acclimation and freezing and its relationship to frost tolerance in barley and wheat. | |
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MedLine Citation:
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PMID: 16997899 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Amino acid homeostasis was investigated in frost-resistant barley seedlings under either cold- or freezing-stress conditions. Total free amino acid content varied only slightly, but a substantial conversion of glutamate to gamma-aminobutyric acid (GABA) was found that was proportional to the severity of the stress. Cold acclimation caused a significant increase in amino acid pools, and induced the expression of the GABA-shunt genes. As a consequence, GABA accumulated to a higher extent during the subsequent exposure to lower temperature. A different picture was obtained with a frost-sensitive genotype, in which glutamate decarboxylation occurred during the stress as well, but the activation of the GABA shunt seemed not to take place, and free glutamate was almost depleted. Analogous results were found in frost-resistant and frost-sensitive wheat cultivars. Feeding non-hardened plants with exogenous glutamate resulted in increased GABA accumulation under low temperature. The possibility that glutamate decarboxylation and GABA metabolism would play a role in frost tolerance is discussed. |
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Authors:
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Elisabetta Mazzucotelli; Alfredo Tartari; Luigi Cattivelli; Giuseppe Forlani |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-09-22 |
Journal Detail:
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Title: Journal of experimental botany Volume: 57 ISSN: 0022-0957 ISO Abbreviation: J. Exp. Bot. Publication Date: 2006 |
Date Detail:
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Created Date: 2006-11-14 Completed Date: 2007-02-27 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 9882906 Medline TA: J Exp Bot Country: England |
Other Details:
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Languages: eng Pagination: 3755-66 Citation Subset: IM |
Affiliation:
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Dipartimento di Biologia, Università di Ferrara, via L. Borsari 46, 44100 Ferrara (FE), Italy. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acclimatization* Amino Acids / metabolism Cold Temperature* Decarboxylation Freezing Genotype Glutamic Acid / metabolism Homeostasis Hordeum / genetics, metabolism*, physiology Plant Proteins / genetics, metabolism Triticum / genetics, metabolism*, physiology gamma-Aminobutyric Acid / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Amino Acids; 0/Plant Proteins; 56-12-2/gamma-Aminobutyric Acid; 56-86-0/Glutamic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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