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Τίτλος: Polyamine oxidase 5 loss-of-function mutations in Arabidopsis thaliana trigger metabolic and transcriptional reprogramming and promote salt stress tolerance
Συγγραφείς: Zarza, Xavier 
Atanasov, Kostadin E. 
Marco, Francisco 
Arbona, Vicent 
Carrasco, Pedro 
Kopka, Joachim 
Fotopoulos, Vasileios 
Munnik, Teun 
Gómez-Cadenas, Aurelio 
Tiburcio, Antonio F. 
Alcázar, Rubén 
Major Field of Science: Agricultural Sciences
Field Category: Agriculture Forestry and Fisheries
Λέξεις-κλειδιά: Jasmonates;Polyamines;Metabolomics;Salt tolerance;Thermospermine
Ημερομηνία Έκδοσης: Απρ-2017
Πηγή: Plant, Cell and Environment, 2017, vol. 40, no. 4, pp. 527-542
Volume: 40
Issue: 4
Start page: 527
End page: 542
Περιοδικό: Plant, Cell and Environment 
Περίληψη: The family of polyamine oxidases (PAO) in Arabidopsis (AtPAO1-5) mediates polyamine (PA) back-conversion, which reverses the PA biosynthetic pathway from spermine and its structural isomer thermospermine (tSpm) into spermidine and then putrescine. Here, we have studied the involvement of PA back-conversion in Arabidopsis salinity tolerance. AtPAO5 is the Arabidopsis PAO gene member most transcriptionally induced by salt stress. Two independent loss-of-function mutants (atpao5-2 and atpao5-3) were found to exhibit constitutively higher tSpm levels, with associated increased salt tolerance. Using global transcriptional and metabolomic analyses, the underlying mechanisms were studied. Stimulation of abscisic acid and jasmonate (JA) biosynthesis and accumulation of important compatible solutes, such as sugars, polyols and proline, as well as TCA cycle intermediates were observed in atpao5 mutants under salt stress. Expression analyses indicate that tSpm modulates the transcript levels of several target genes, including many involved in the biosynthesis and signalling of JA, some of which are already known to promote salinity tolerance. Transcriptional modulation by tSpm is isomer-dependent, thus demonstrating the specificity of this response. Overall, we conclude that tSpm triggers metabolic and transcriptional reprogramming that promotes salt stress tolerance in Arabidopsis.
URI: https://hdl.handle.net/20.500.14279/9126
ISSN: 13653040
DOI: 10.1111/pce.12714
Rights: © Wiley
Type: Article
Affiliation: University of Barcelona 
University of Amsterdam 
Universidad de Valencia 
Universitat Jaume I 
Max Planck Institute 
Cyprus University of Technology 
Publication Type: Peer Reviewed
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