Abstract
Lignification of the cell wall of primary and secondary xylem vessels in lupin ( Lupinus albus cv Multolupa) hypocotyls is associated first with an increase in the level of cell wall peroxidase activity, due mainly to the specific expression of the isoenzyme A 1, followed by a decrease in the activity, caused by its disappearance. Since during the oxidation of coniferyl alcohol by cell wall acidic peroxidases from lupin hypocotyls a specific inactivation of peroxidase isoenzyme A 1 takes place, this process is apparently responsible for the loss of peroxidase activity in lignified lupin cell walls.
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