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Expression of a poplar cDNA encoding a ferulate-5-hydroxylase/coniferaldehyde 5-hydroxylase increases S lignin deposition in Arabidopsis thaliana Inra
Sibout, R.; Baucher, M.; Gatineau, M.; Van Doorsselaere, J.; Mila, I.; Pollet, B.; Maba, B.; Pilate, G.; Lapierre, C.; Boerjan, W.; Jouanin, L..
Ferulate-5-hydroxylase or coniferaldehyde 5-hydroxylase (F5H or Cald5H; CYP84A1) is the enzyme responsible for the lasthydroxylation of the syringyl-type lignin precursors. A cDNA clone highly homologous to the Arabidopsis thaliana F5H/Cald5H cDNAwas identified during the random sequencing of a poplar (Populus trichocarpa) differentiating xylem cDNA library. Present as a multigenicfamily in poplar, this gene (PopF5H) was found to be highly expressed in lignified tissues supporting its role in lignin biosynthesis. Whenplaced under the control of the CaMV 35S promoter, the poplar F5H was able to complement the A. thaliana fah1-2 mutation.Overexpression in wild-type A. thaliana substantially increased the level of syringyl units in lignins. These transgenic...
Tipo: Journal Article Palavras-chave: BIOSYNTHESE DE LA LIGNINE; EXPRESSION DES GENES; ADNC FERULATE 5-HYDROXYLASE; POPULUS TRICHOCARPA; ARABIDOPSIS THALIANA.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007a66658c5&uri=/notices/prodinra1/2008/12/
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Identification of the structure and origin of thioacidolysis marker compounds for cinnamyl alcohol dehydrogenase deficiency in angiosperms Inra
Kim, H.; Ralph, J.; Lu, F.; Pilate, G.; Leplé, J.C.; Pollet, B.; Lapierre, C..
Molecular marker compounds, derived from lignin by the thioacidolysis degradative method, for cinnamyl alcohol dehydrogenase (CAD) deficiency in angiosperms have been structurally identified as indene derivatives. They are shown to derive from hydroxycinnamyl aldehydes that have undergone 8-O-4-cross-coupling during lignification. As such, they are valuable markers for ascertaining plant responses to various levels of CAD down-regulation. Their derivation illustrates that hydroxycinnamyl aldehydes incorporate into angiosperm lignins by endwise coupling reactions in much the same way as normal monolignols do, suggesting that the hydroxycinnamyl aldehydes should be considered authentic lignin precursors.
Tipo: Journal Article Palavras-chave: BIOSYNTHESE DE LA LIGNINE.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007f4cdd854&uri=/notices/prodinra1/2010/11/
Registros recuperados: 2
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