Abstract
Hydroxycinnamates are found associated with suberin in several forms: covalently linked to the aliphatic suberin; in the residue after suberin-removal; and in the non-polar extractives of suberized tissues in the form of alkyl ferulates. Suberin-associated hydroxycinnamates have been found mainly as ferulic acid-derivatives, sometimes as feruloylamides and in a lesser extent as caffeates. Ferulic acid esters of long-chain ω-hydroxyacids are prevalent in the partial depolymerisation products of suberin. Also, enzymes able to catalyze the feruloylation of ω-hydroxyacids were found timely-associated with the suberization process. It is proposed that ferulic acid, and its dimers, through esterification to ω-hydroxyacids, covalently link the suberin aliphatic polyester to suberin-associated polyaromatics. In this case, the known role of ferulates, and related hydroxycinnamates, as cross-linkers of structurally different polymers would be enlarged to suberized cell-walls.
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Graça, J. Hydroxycinnamates in suberin formation. Phytochem Rev 9, 85–91 (2010). https://doi.org/10.1007/s11101-009-9138-4
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DOI: https://doi.org/10.1007/s11101-009-9138-4