Hydroxycinnamates in suberin formation |
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Authors: | José Graça |
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Institution: | (1) Centro de Estudos Florestais, Instituto Superior de Agronomia, TULisbon, 1349-017 Lisbon, Portugal |
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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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