Linked Life Data

16659919

Source:http://linkedlifedata.com/resource/pubmed/id/16659919

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pubmed-article:16659919pubmed:dateCreated2010-6-29lld:pubmed
pubmed-article:16659919pubmed:abstractTextExperiments were undertaken to identify and characterize control mechanisms in tobacco leaf tissue which decrease the relative contribution of photorespiratory CO(2) release and thereby increase net photosynthetic CO(2) fixation. A number of metabolites were supplied to illuminated leaf discs and their effect on the inhibition of glycolate synthesis was measured. Glycolate accumulation, in the presence of alpha-hydroxy-2-pyridinemethanesulfonic acid, was inhibited in leaf discs previously floated on 30 mM solutions of either L-glutamate, L-aspartate, phospho-enolpyruvate, or glyoxylate. The effect of glutamate on glycolate synthesis, which was investigated in detail, was concentration- and time-dependent. Glycolate synthesis was inhibited about 40% by treating leaf discs with 30 mM glutamate, and the inhibition continued for more than 4 hours after the glutamate solution was removed.The glutamate inhibition of glycolate synthesis was accompanied by a marked decrease in the rate of photorespiratory CO(2) release and by maximal increases of about 25% in net photosynthetic CO(2) fixation. The products of (14)CO(2) fixation in leaf discs previously treated with glutamate showed a decrease in glycine (26%), serine (12%), and the stronger acids (18%), and an increase in the neutral compounds (26%) in comparison with discs floated only on water.Data are presented which question whether a catabolite of glutamate or the amino acid itself is responsible for the results observed. These experiments support the view that a genetic selection strategy based on the metabolic control of photorespiration would result in large increases in net photosynthetic CO(2) assimilation in species with high rates of photorespiration.lld:pubmed
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pubmed-article:16659919pubmed:authorpubmed-author:OliverD JDJlld:pubmed
pubmed-article:16659919pubmed:authorpubmed-author:ZelitchIIlld:pubmed
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pubmed-article:16659919pubmed:volume59lld:pubmed
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pubmed-article:16659919pubmed:pagination688-94lld:pubmed
pubmed-article:16659919pubmed:dateRevised2010-9-14lld:pubmed
pubmed-article:16659919pubmed:year1977lld:pubmed
pubmed-article:16659919pubmed:articleTitleMetabolic regulation of glycolate synthesis, photorespiration, and net photosynthesis in tobacco by L-glutamate.lld:pubmed
pubmed-article:16659919pubmed:affiliationDepartment of Biochemistry, The Connecticut Agricultural Experiment Station, NW Haven, Connecticut 06504.lld:pubmed
pubmed-article:16659919pubmed:publicationTypeJournal Articlelld:pubmed
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