Author
LAPIERRE, CAHTERINE - INRA-GRIGNON,FRANCE | |
KIM, HOON - UNIVERSITY OF WISCONSIN | |
LU, FACHUANG - UNIVERSITY OF WISCONSIN | |
MARITA, JANE - UNIVERSITY OF WISCONSIN | |
MILA, ISABELLE - INRA-GRIGNON,FRANCE | |
POLLET, BRIGITTE - INRA-GRIGNON,FRANCE | |
Ralph, John |
Submitted to: Meeting Abstract
Publication Type: Proceedings Publication Acceptance Date: 6/11/2001 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Down-regulating genes for enzymes late in the lignin biosynthetic pathway can lead to the incorporation of novel monomers into lignins resulting in new structures in the polymer. For example, coniferyl and sinapyl aldehydes incorporate intimately into lignins in CAD-deficient angiosperms; new hydroxycinnamyl aldehyde 8-O-4-structures result in the lignins. Following thioacidolysis, these structures release new units not found from normal lignins which are therefore valuable marker compounds for CAD-deficiency in angiosperms. Similarly, COMT-deficient plants incorporate 5-hydroxy-coniferyl alcohol into their lignins. A 5-hydroxy-guaiacyl thioacidolysis monomer is partially released and provides a convenient marker. More diagnostic are the benzodioxane dimers released by thioacidolysis or the DFRC method. |