Oil and Protein Accumulation in Developing Seeds Is Influenced by the Expression of a Cytosolic Pyrophosphatase in Arabidopsis

This study describes a dominant low-seed-oil mutant (lo15571) of Arabidopsis (Arabidopsis thaliana) generated by enhancer tagging. Compositional analysis of developing siliques and mature seeds indicated reduced conversion of photoassimilates to oil. Immunoblot analysis revealed increased levels of...

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Veröffentlicht in:Plant physiology (Bethesda) 2012-07, Vol.159 (3), p.1221-1234
Hauptverfasser: Meyer, Knut, Stecca, Kevin L., Ewell-Hicks, Kim, Allen, Stephen M., Everard, John D.
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Stecca, Kevin L.
Ewell-Hicks, Kim
Allen, Stephen M.
Everard, John D.
description This study describes a dominant low-seed-oil mutant (lo15571) of Arabidopsis (Arabidopsis thaliana) generated by enhancer tagging. Compositional analysis of developing siliques and mature seeds indicated reduced conversion of photoassimilates to oil. Immunoblot analysis revealed increased levels of At1g01050 protein in developing siliques of lo15571. At1g01050 encodes a soluble, cytosolic pyrophosphatase and is one of five closely related genes that share predicted cytosolic localization and at least 70% amino acid sequence identity. Expression of At1g01050 using a seed-preferred promoter recreated most features of the lo15571 seed phenotype, including low seed oil content and increased levels of transient starch and soluble sugars in developing siliques. Seed-preferred RNA interference-mediated silencing of Atlg01050 and At3g53620, a second cytosolic pyrophosphatase gene that shows expression during seed filling, led to a heritable oil increase of 1% to 4%, mostly at the expense of seed storage protein. These results are consistent with a scenario in which the rate of mobilization of sucrose, for precursor supply of seed storage lipid biosynthesis by cytosolic glycolysis, is strongly influenced by the expression of endogenous pyrophosphatase enzymes. This emphasizes the central role of pyrophosphate-dependent reactions supporting cytosolic glycolysis during seed maturation when ATP supply is low, presumably due to hypoxic conditions. This route is the major route providing precursors for seed oil biosynthesis. ATP-dependent reactions at the entry point of glycolysis in the cytosol or plastid cannot fully compensate for the loss of oil content observed in transgenic events with increased expression of cytosolic pyrophosphatase enzyme in the cytosol. These findings shed new light on the dynamic properties of cytosolic pyrophosphate pools in developing seed and their influence on carbon partitioning during seed filling. Finally, our work uniquely demonstrates that genes encoding cytosolic pyrophosphatase enzymes provide novel targets to improve seed composition for plant biotechnology applications.
doi_str_mv 10.1104/pp.112.198309
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Compositional analysis of developing siliques and mature seeds indicated reduced conversion of photoassimilates to oil. Immunoblot analysis revealed increased levels of At1g01050 protein in developing siliques of lo15571. At1g01050 encodes a soluble, cytosolic pyrophosphatase and is one of five closely related genes that share predicted cytosolic localization and at least 70% amino acid sequence identity. Expression of At1g01050 using a seed-preferred promoter recreated most features of the lo15571 seed phenotype, including low seed oil content and increased levels of transient starch and soluble sugars in developing siliques. Seed-preferred RNA interference-mediated silencing of Atlg01050 and At3g53620, a second cytosolic pyrophosphatase gene that shows expression during seed filling, led to a heritable oil increase of 1% to 4%, mostly at the expense of seed storage protein. These results are consistent with a scenario in which the rate of mobilization of sucrose, for precursor supply of seed storage lipid biosynthesis by cytosolic glycolysis, is strongly influenced by the expression of endogenous pyrophosphatase enzymes. This emphasizes the central role of pyrophosphate-dependent reactions supporting cytosolic glycolysis during seed maturation when ATP supply is low, presumably due to hypoxic conditions. This route is the major route providing precursors for seed oil biosynthesis. ATP-dependent reactions at the entry point of glycolysis in the cytosol or plastid cannot fully compensate for the loss of oil content observed in transgenic events with increased expression of cytosolic pyrophosphatase enzyme in the cytosol. These findings shed new light on the dynamic properties of cytosolic pyrophosphate pools in developing seed and their influence on carbon partitioning during seed filling. Finally, our work uniquely demonstrates that genes encoding cytosolic pyrophosphatase enzymes provide novel targets to improve seed composition for plant biotechnology applications.</description><identifier>ISSN: 0032-0889</identifier><identifier>ISSN: 1532-2548</identifier><identifier>EISSN: 1532-2548</identifier><identifier>DOI: 10.1104/pp.112.198309</identifier><identifier>PMID: 22566496</identifier><identifier>CODEN: PPHYA5</identifier><language>eng</language><publisher>Rockville, MD: American Society of Plant Biologists</publisher><subject>adenosine triphosphate ; amino acid sequences ; Amino acids ; anaerobic conditions ; Arabidopsis - enzymology ; Arabidopsis - genetics ; Arabidopsis - growth &amp; development ; Arabidopsis Proteins - genetics ; Arabidopsis Proteins - metabolism ; Arabidopsis thaliana ; ATP ; BIOCHEMICAL PROCESS AND MACROMOLECULAR STRUCTURES ; Biochemical Processes and Macromolecular Structures ; Biological and medical sciences ; Biosynthesis ; Biotechnology ; carbon ; Centrifugation, Density Gradient ; Crosses, Genetic ; cytosol ; Cytosol - enzymology ; Enzymes ; filling period ; fruits ; Fundamental and applied biological sciences. Psychology ; Gene Expression Regulation, Plant ; genes ; Genes, Dominant - genetics ; Genes, Plant - genetics ; Genetic Association Studies ; genetically modified organisms ; Glycolysis ; Hypoxia ; Immunoblotting ; lipid content ; lipids ; Models, Biological ; Mutagenesis, Insertional - genetics ; mutants ; Mutation - genetics ; Oils &amp; fats ; phenotype ; Phenotypes ; Phylogeny ; Plant Oils - metabolism ; Plant physiology and development ; Plants ; Plants, Genetically Modified ; Pyrophosphatases - genetics ; Pyrophosphatases - metabolism ; Reproducibility of Results ; RNA ; RNA Interference ; Seed maturation ; seed oils ; Seed storage ; Seeds ; Seeds - growth &amp; development ; Seeds - metabolism ; sequence analysis ; starch ; Starches ; sucrose ; Sugars</subject><ispartof>Plant physiology (Bethesda), 2012-07, Vol.159 (3), p.1221-1234</ispartof><rights>2012 American Society of Plant Biologists</rights><rights>2015 INIST-CNRS</rights><rights>Copyright American Society of Plant Biologists Jul 2012</rights><rights>2012 American Society of Plant Biologists. 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Compositional analysis of developing siliques and mature seeds indicated reduced conversion of photoassimilates to oil. Immunoblot analysis revealed increased levels of At1g01050 protein in developing siliques of lo15571. At1g01050 encodes a soluble, cytosolic pyrophosphatase and is one of five closely related genes that share predicted cytosolic localization and at least 70% amino acid sequence identity. Expression of At1g01050 using a seed-preferred promoter recreated most features of the lo15571 seed phenotype, including low seed oil content and increased levels of transient starch and soluble sugars in developing siliques. Seed-preferred RNA interference-mediated silencing of Atlg01050 and At3g53620, a second cytosolic pyrophosphatase gene that shows expression during seed filling, led to a heritable oil increase of 1% to 4%, mostly at the expense of seed storage protein. These results are consistent with a scenario in which the rate of mobilization of sucrose, for precursor supply of seed storage lipid biosynthesis by cytosolic glycolysis, is strongly influenced by the expression of endogenous pyrophosphatase enzymes. This emphasizes the central role of pyrophosphate-dependent reactions supporting cytosolic glycolysis during seed maturation when ATP supply is low, presumably due to hypoxic conditions. This route is the major route providing precursors for seed oil biosynthesis. ATP-dependent reactions at the entry point of glycolysis in the cytosol or plastid cannot fully compensate for the loss of oil content observed in transgenic events with increased expression of cytosolic pyrophosphatase enzyme in the cytosol. These findings shed new light on the dynamic properties of cytosolic pyrophosphate pools in developing seed and their influence on carbon partitioning during seed filling. Finally, our work uniquely demonstrates that genes encoding cytosolic pyrophosphatase enzymes provide novel targets to improve seed composition for plant biotechnology applications.</description><subject>adenosine triphosphate</subject><subject>amino acid sequences</subject><subject>Amino acids</subject><subject>anaerobic conditions</subject><subject>Arabidopsis - enzymology</subject><subject>Arabidopsis - genetics</subject><subject>Arabidopsis - growth &amp; development</subject><subject>Arabidopsis Proteins - genetics</subject><subject>Arabidopsis Proteins - metabolism</subject><subject>Arabidopsis thaliana</subject><subject>ATP</subject><subject>BIOCHEMICAL PROCESS AND MACROMOLECULAR STRUCTURES</subject><subject>Biochemical Processes and Macromolecular Structures</subject><subject>Biological and medical sciences</subject><subject>Biosynthesis</subject><subject>Biotechnology</subject><subject>carbon</subject><subject>Centrifugation, Density Gradient</subject><subject>Crosses, Genetic</subject><subject>cytosol</subject><subject>Cytosol - enzymology</subject><subject>Enzymes</subject><subject>filling period</subject><subject>fruits</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Gene Expression Regulation, Plant</subject><subject>genes</subject><subject>Genes, Dominant - genetics</subject><subject>Genes, Plant - genetics</subject><subject>Genetic Association Studies</subject><subject>genetically modified organisms</subject><subject>Glycolysis</subject><subject>Hypoxia</subject><subject>Immunoblotting</subject><subject>lipid content</subject><subject>lipids</subject><subject>Models, Biological</subject><subject>Mutagenesis, Insertional - genetics</subject><subject>mutants</subject><subject>Mutation - genetics</subject><subject>Oils &amp; fats</subject><subject>phenotype</subject><subject>Phenotypes</subject><subject>Phylogeny</subject><subject>Plant Oils - metabolism</subject><subject>Plant physiology and development</subject><subject>Plants</subject><subject>Plants, Genetically Modified</subject><subject>Pyrophosphatases - genetics</subject><subject>Pyrophosphatases - metabolism</subject><subject>Reproducibility of Results</subject><subject>RNA</subject><subject>RNA Interference</subject><subject>Seed maturation</subject><subject>seed oils</subject><subject>Seed storage</subject><subject>Seeds</subject><subject>Seeds - growth &amp; 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Compositional analysis of developing siliques and mature seeds indicated reduced conversion of photoassimilates to oil. Immunoblot analysis revealed increased levels of At1g01050 protein in developing siliques of lo15571. At1g01050 encodes a soluble, cytosolic pyrophosphatase and is one of five closely related genes that share predicted cytosolic localization and at least 70% amino acid sequence identity. Expression of At1g01050 using a seed-preferred promoter recreated most features of the lo15571 seed phenotype, including low seed oil content and increased levels of transient starch and soluble sugars in developing siliques. Seed-preferred RNA interference-mediated silencing of Atlg01050 and At3g53620, a second cytosolic pyrophosphatase gene that shows expression during seed filling, led to a heritable oil increase of 1% to 4%, mostly at the expense of seed storage protein. These results are consistent with a scenario in which the rate of mobilization of sucrose, for precursor supply of seed storage lipid biosynthesis by cytosolic glycolysis, is strongly influenced by the expression of endogenous pyrophosphatase enzymes. This emphasizes the central role of pyrophosphate-dependent reactions supporting cytosolic glycolysis during seed maturation when ATP supply is low, presumably due to hypoxic conditions. This route is the major route providing precursors for seed oil biosynthesis. ATP-dependent reactions at the entry point of glycolysis in the cytosol or plastid cannot fully compensate for the loss of oil content observed in transgenic events with increased expression of cytosolic pyrophosphatase enzyme in the cytosol. These findings shed new light on the dynamic properties of cytosolic pyrophosphate pools in developing seed and their influence on carbon partitioning during seed filling. Finally, our work uniquely demonstrates that genes encoding cytosolic pyrophosphatase enzymes provide novel targets to improve seed composition for plant biotechnology applications.</abstract><cop>Rockville, MD</cop><pub>American Society of Plant Biologists</pub><pmid>22566496</pmid><doi>10.1104/pp.112.198309</doi><tpages>14</tpages><oa>free_for_read</oa></addata></record>
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source Jstor Complete Legacy; Oxford University Press Journals All Titles (1996-Current); MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects adenosine triphosphate
amino acid sequences
Amino acids
anaerobic conditions
Arabidopsis - enzymology
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Arabidopsis thaliana
ATP
BIOCHEMICAL PROCESS AND MACROMOLECULAR STRUCTURES
Biochemical Processes and Macromolecular Structures
Biological and medical sciences
Biosynthesis
Biotechnology
carbon
Centrifugation, Density Gradient
Crosses, Genetic
cytosol
Cytosol - enzymology
Enzymes
filling period
fruits
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Plant
genes
Genes, Dominant - genetics
Genes, Plant - genetics
Genetic Association Studies
genetically modified organisms
Glycolysis
Hypoxia
Immunoblotting
lipid content
lipids
Models, Biological
Mutagenesis, Insertional - genetics
mutants
Mutation - genetics
Oils & fats
phenotype
Phenotypes
Phylogeny
Plant Oils - metabolism
Plant physiology and development
Plants
Plants, Genetically Modified
Pyrophosphatases - genetics
Pyrophosphatases - metabolism
Reproducibility of Results
RNA
RNA Interference
Seed maturation
seed oils
Seed storage
Seeds
Seeds - growth & development
Seeds - metabolism
sequence analysis
starch
Starches
sucrose
Sugars
title Oil and Protein Accumulation in Developing Seeds Is Influenced by the Expression of a Cytosolic Pyrophosphatase in Arabidopsis
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