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  Multilevel Analysis of Primary Metabolism Provides New Insights into the Role of Potassium Nutrition for Glycolysis and Nitrogen Assimilation in Arabidopsis Roots

Armengaud, P., Sulpice, R., Miller, A. J., Stitt, M., Amtmann, A., & Gibon, Y. (2009). Multilevel Analysis of Primary Metabolism Provides New Insights into the Role of Potassium Nutrition for Glycolysis and Nitrogen Assimilation in Arabidopsis Roots. Plant Physiology, 150(2), 772-785. doi:10.1104/pp.108.133629.

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 Creators:
Armengaud, P.1, Author
Sulpice, R.2, Author              
Miller, A. J.1, Author
Stitt, M.2, Author              
Amtmann, A.1, Author
Gibon, Y.2, Author              
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1External Organizations, ou_persistent22              
2System Regulation, Department Stitt, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753327              

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Free keywords: cytosolic pyruvate-kinase nicotiana-tabacum-l nad-malic enzyme univalent cations tobacco plants selective microelectrodes magnesium-deficiency ion transporters bean-plants amino-acids
 Abstract: Potassium (K) is required in large quantities by growing crops, but faced with high fertilizer prices, farmers often neglect K application in favor of nitrogen and phosphorus. As a result, large areas of farmland are now depleted of K. K deficiency affects the metabolite content of crops with negative consequences for nutritional quality, mechanical stability, and pathogen/pest resistance. Known functions of K in solute transport, protein synthesis, and enzyme activation point to a close relationship between K and metabolism, but it is unclear which of these are the most critical ones and should be targeted in biotechnological efforts to improve K usage efficiency. To identify metabolic targets and signaling components of K stress, we adopted a multilevel approach combining transcript profiles with enzyme activities and metabolite profiles of Arabidopsis (Arabidopsis thaliana) plants subjected to low K and K resupply. Roots and shoots were analyzed separately. Our results show that regulation of enzymes at the level of transcripts and proteins is likely to play an important role in plant adaptation to K deficiency by (1) maintaining carbon flux into amino acids and proteins, (2) decreasing negative metabolic charge, and (3) increasing the nitrogen-carbon ratio in amino acids. However, changes in transcripts and enzyme activities do not explain the strong and reversible depletion of pyruvate and accumulation of sugars observed in the roots of low-K plants. We propose that the primary cause of metabolic disorders in low-K plants resides in the direct inhibition of pyruvate kinase activity by low cytoplasmic K in root cells.

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Language(s): eng - English
 Dates: 2009-04-072009
 Publication Status: Published in print
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 Identifiers: ISI: ISI:000266663700021
DOI: 10.1104/pp.108.133629
ISSN: 0032-0889 (Print) 0032-0889 (Linking)
URI: ://000266663700021 http://www.jstor.org/stable/pdfplus/40538049.pdf
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Title: Plant Physiology
Source Genre: Journal
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Pages: - Volume / Issue: 150 (2) Sequence Number: - Start / End Page: 772 - 785 Identifier: -