Silencing an N-Acyltransferase-Like involved in lignin biosynthesis in nicotiana attenuata dramatically alters herbivory-induced phenolamide metabolism

In a transcriptomic screen of Manduca sexta-induced N-acyltransferases in leaves of Nicotiana attenuata, we identified an N-acyltransferase gene sharing a high similarity with the tobacco lignin-biosynthetic hydroxycinnamoyl-CoA:shikimate/quinate hydroxycinnamoyl transferase (HCT) gene whose express...

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Hauptverfasser: Gaquerel, Emmanuel (VerfasserIn) , Kotkar, Hemlata M. (VerfasserIn) , Onkokesung, Nawaporn (VerfasserIn) , Galis, Ivan (VerfasserIn) , Baldwin, Ian T. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: May 21, 2013
In: PLOS ONE
Year: 2013, Jahrgang: 8, Heft: 5
ISSN:1932-6203
DOI:10.1371/journal.pone.0062336
Online-Zugang:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1371/journal.pone.0062336
Verlag, kostenfrei, Volltext: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0062336
Volltext
Verfasserangaben:Emmanuel Gaquerel, Hemlata Kotkar, Nawaporn Onkokesung, Ivan Galis, Ian T. Baldwin

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520 |a In a transcriptomic screen of Manduca sexta-induced N-acyltransferases in leaves of Nicotiana attenuata, we identified an N-acyltransferase gene sharing a high similarity with the tobacco lignin-biosynthetic hydroxycinnamoyl-CoA:shikimate/quinate hydroxycinnamoyl transferase (HCT) gene whose expression is controlled by MYB8, a transcription factor that regulates the production of phenylpropanoid polyamine conjugates (phenolamides, PAs). To evaluate the involvement of this HCT-like gene in lignin production as well as the resulting crosstalk with PA metabolism during insect herbivory, we transiently silenced (by VIGs) the expression of this gene and performed non-targeted (UHPLC-ESI/TOF-MS) metabolomics analyses. In agreement with a conserved function of N. attenuata HCT-like in lignin biogenesis, HCT-silenced plants developed weak, soft stems with greatly reduced lignin contents. Metabolic profiling demonstrated large shifts (up to 12% deregulation in total extracted ions in insect-attacked leaves) due to a large diversion of activated coumaric acid units into the production of developmentally and herbivory-induced coumaroyl-containing PAs (N′,N′′-dicoumaroylspermidine, N′,N′′-coumaroylputrescine, etc) and to minor increases in the most abundant free phenolics (chlorogenic and cryptochlorogenic acids), all without altering the production of well characterized herbivory-responsive caffeoyl- and feruloyl-based putrescine and spermidine PAs. These data are consistent with a strong metabolic tension, exacerbated during herbivory, over the allocation of coumaroyl-CoA units among lignin and unusual coumaroyl-containing PAs, and rule out a role for HCT-LIKE in tuning the herbivory-induced accumulation of other PAs. Additionally, these results are consistent with a role for lignification as an induced anti-herbivore defense. 
650 4 |a Biosynthesis 
650 4 |a Herbivory 
650 4 |a Insects 
650 4 |a Leaves 
650 4 |a Lignin 
650 4 |a Metabolites 
650 4 |a Nicotiana 
650 4 |a Plant-herbivore interactions 
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