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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1111/nph.12307
|2 doi
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|a pubmed25n0757.xml
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|a (NLM)23647084
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Guiboileau, Anne
|e verfasserin
|4 aut
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| 245 |
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|a Physiological and metabolic consequences of autophagy deficiency for the management of nitrogen and protein resources in Arabidopsis leaves depending on nitrate availability
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|c 2013
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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| 500 |
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|a Date Completed 29.01.2014
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2013 INRA. New Phytologist © 2013 New Phytologist Trust.
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|a Autophagy is present at a basal level in all plant tissues and is induced during leaf ageing and in response to nitrogen (N) starvation. Nitrogen remobilization from the rosette to the seeds is impaired in autophagy mutants. This report focuses on the role of autophagy in leaf N management and proteolysis during plant ageing. Metabolites, enzyme activities and protein contents were monitored in several autophagy-defective (atg) Arabidopsis mutants grown under low and high nitrate conditions. Results showed that carbon (C) and N statuses were affected in atg mutants before any senescence symptoms appeared. atg mutants accumulated larger amounts of ammonium, amino acids and proteins than wild type, and were depleted in sugars. Over-accumulation of proteins in atg mutants was selective and occurred despite higher endopeptidase and carboxypeptidase activities. Specific over-accumulation of the ribosomal proteins S6 and L13 subunits, and of catalase and glutamate dehydrogenase proteins was observed. atg mutants also accumulated peptides putatively identified as degradation products of the Rubisco large subunit and glutamine synthetase 2 (GS2). Incomplete chloroplast protein degradation resulting from autophagy defects could explain the higher N concentrations measured in atg rosettes and defects in N remobilization. It is concluded that autophagy controls C : N status and protein content in leaves of Arabidopsis
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a aminopeptidase
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|a carboxypeptidase
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|a leaf senescence
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|a nitrate availability
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|a nitrogen remobilization
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|a selective autophagy
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|a Arabidopsis Proteins
|2 NLM
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|a Nitrates
|2 NLM
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|a Carbon
|2 NLM
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|a 7440-44-0
|2 NLM
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|a Peptide Hydrolases
|2 NLM
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| 650 |
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|a EC 3.4.-
|2 NLM
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|a Glutamate-Ammonia Ligase
|2 NLM
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| 650 |
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|a EC 6.3.1.2
|2 NLM
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| 650 |
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|a Nitrogen
|2 NLM
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| 650 |
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|a N762921K75
|2 NLM
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| 700 |
1 |
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|a Avila-Ospina, Liliana
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yoshimoto, Kohki
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Soulay, Fabienne
|e verfasserin
|4 aut
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| 700 |
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|a Azzopardi, Marianne
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Marmagne, Anne
|e verfasserin
|4 aut
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| 700 |
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|a Lothier, Jérémy
|e verfasserin
|4 aut
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| 700 |
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|a Masclaux-Daubresse, Céline
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1990
|g 199(2013), 3 vom: 04. Aug., Seite 683-94
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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| 773 |
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|g volume:199
|g year:2013
|g number:3
|g day:04
|g month:08
|g pages:683-94
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| 856 |
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|u http://dx.doi.org/10.1111/nph.12307
|3 Volltext
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