Impact of CCR1 silencing on the assembly of lignified secondary walls in Arabidopsis thaliana

A cinnamoyl-CoA reductase 1 knockout mutant in Arabidopsis thaliana was investigated for the consequences of lignin synthesis perturbation on the assembly of the cell walls. The mutant displayed a dwarf phenotype and a strong collapse of its xylem vessels corresponding to lower lignin content and a...

Ausführliche Beschreibung

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 184(2009), 1 vom: 01., Seite 99-113
1. Verfasser: Ruel, Katia (VerfasserIn)
Weitere Verfasser: Berrio-Sierra, Jimmy, Derikvand, Mohammad Mir, Pollet, Brigitte, Thévenin, Johanne, Lapierre, Catherine, Jouanin, Lise, Joseleau, Jean-Paul
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2009
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Plant Extracts Lignin 9005-53-2 Xylose A1TA934AKO Aldehyde Oxidoreductases EC 1.2.- cinnamoyl CoA reductase mehr... EC 1.2.1.44 Glucose IY9XDZ35W2
Beschreibung
Zusammenfassung:A cinnamoyl-CoA reductase 1 knockout mutant in Arabidopsis thaliana was investigated for the consequences of lignin synthesis perturbation on the assembly of the cell walls. The mutant displayed a dwarf phenotype and a strong collapse of its xylem vessels corresponding to lower lignin content and a loss of lignin units of the noncondensed type. Transmission electron microscopy revealed that the transformation considerably impaired the capacity of interfascicular fibers and vascular bundles to complete the assembly of cellulose microfibrils in the S(2) layer, the S(1) layer remaining unaltered. Such disorder in cellulose was correlated with X-ray diffraction showing altered organization. Semi-quantitative immunolabeling of lignins showed that the patterns of distribution were differentially affected in interfascicular fibers and vascular bundles, pointing to the importance of noncondensed lignin structures for the assembly of a coherent secondary wall. The use of laser capture microdissection combined with the microanalysis of lignins and polysaccharides allowed these polymers to be characterized into specific cell types. Wild-type A. thaliana displayed a two-fold higher syringyl to guaiacyl ratio in interfascicular fibers compared with vascular bundles, whereas this difference was less marked in the cinnamoyl-CoA reductase 1 knockout mutant
Beschreibung:Date Completed 12.11.2009
Date Revised 18.03.2022
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/j.1469-8137.2009.02951.x