Linked Life Data

20444205

Source:http://linkedlifedata.com/resource/pubmed/id/20444205

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pubmed-article:20444205pubmed:abstractTextNitrogen (N) metabolism was characterized in the developing ear of glutamine synthetase deficient mutants (gln1-3, gln1-4 and gln1-3/gln1-4) of maize exhibiting a reduction in kernel yield. During the grain-filling period, the metabolite contents, enzyme activities and steady-state levels of transcripts for marker genes of amino acid synthesis and interconversion were monitored in the cob and kernels. The ear of gln1-3 and gln1-3/gln1-4 had a higher free amino acid content and a lower C/N ratio, when compared to the wild type. The free ammonium concentrations were also much higher in gln1-3/gln1-4, and Asn accumulation was higher in gln1-3 and gln1-3/gln1-4. The level of transcripts of ZmAS3 and ZmAS4, two genes encoding asparagine synthetase, increased in the 'aborted kernels' of gln1-3 and gln1-3/gln1-4. The results show that N metabolism is clearly different in developing and 'aborted kernels'. The data support the hypothesis that N accumulated in 'aborted kernels' is remobilized via the cob to developing kernels using Asn as a transport molecule. The two genes ZmAS3 and ZmAS4 are likely to play an important role during this process.lld:pubmed
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pubmed-article:20444205pubmed:authorpubmed-author:LeaPeter JPJlld:pubmed
pubmed-article:20444205pubmed:authorpubmed-author:HirelBertrand...lld:pubmed
pubmed-article:20444205pubmed:authorpubmed-author:QuilleréIsabe...lld:pubmed
pubmed-article:20444205pubmed:authorpubmed-author:CañasRafael...lld:pubmed
pubmed-article:20444205pubmed:copyrightInfo© 2010 INRA. Plant Biotechnology Journal © 2010 Society for Experimental Biology and Blackwell Publishing Ltd.lld:pubmed
pubmed-article:20444205pubmed:issnTypeElectroniclld:pubmed
pubmed-article:20444205pubmed:volume8lld:pubmed
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pubmed-article:20444205pubmed:year2010lld:pubmed
pubmed-article:20444205pubmed:articleTitleAnalysis of amino acid metabolism in the ear of maize mutants deficient in two cytosolic glutamine synthetase isoenzymes highlights the importance of asparagine for nitrogen translocation within sink organs.lld:pubmed
pubmed-article:20444205pubmed:affiliationUnité de Nutrition Azotée des Plantes, Unité de Recherche 511, Institut Jean-Pierre Bourgin, Institut National de la Recherche Agronomique, Centre de Versailles-Grignon, Versailles Cedex, France.lld:pubmed
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