Accession Number : AD0454812


Title :   THE PHENOLIC ACIDS IN WHEAT--III. INSOLUBLE DERIVATIVES OF PHENOLIC CINNAMIC ACIDS AS NATURAL INTERMEDIATES IN LIGNIN BIOSYNTHESIS,


Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA HALIFAX (NOVA SCOTIA) ATLANTIC REGIONAL LAB


Personal Author(s) : El-Basyouni,Said Z ; Neish,A C ; Towers,G H N


Report Date : 06 Apr 1964


Pagination or Media Count : 13


Abstract : C(14) Labeled compounds were administered to wheat shoots and their incorporation into lignin and into p-coumaric, ferulic and sinapic acids was measured. These phenolic cinnamic acids were not present as such but were obtained by alkaline hydrolysis of both the ethanol extract and the insoluble residue. Measurement of the incorporation into lignin was based on alkaline nitrobenzene oxidation of the residue to vanillin, syringaldehyde and p-hydroxybenzaldehyde. Labeled carbon dioxide, phenylalanine or tyrosine was incorporated more readily into the phenolic cinnamic acids bound to the insoluble residue than into ethanol soluble derivatives whereas the reverse was true for labeled precursors such as cinnamic, p-coumaric, caffeic, ferulic, and sinapic acids. Time course studies with labeled carbon dioxide duggested the sequence: carbon dioxide--aromatic amino acids--ethanol-insoluble derivatives of the phenolic cinnamic acids-lignin. Soluble derivatives of the phenolic cinnamic acids appear to exchange with the insoluble derivatives and to act as intermediates in lignification especially when the free acids are administered. A scheme is suggested to explain these complex relationships. (Author)


Descriptors :   *PHENOLS , *LIGNIN , WHEAT , BIOSYNTHESIS , CARBOXYLIC ACIDS , LABELED SUBSTANCES , TRACER STUDIES , MEASUREMENT , CARBON DIOXIDE , PHOTOSYNTHESIS , TABLES(DATA) , RADIOACTIVE ISOTOPES , AROMATIC COMPOUNDS


Distribution Statement : APPROVED FOR PUBLIC RELEASE