Abstract
The amount and composition of cell wall-bound polyphenol (lignin) in cultured Populus trichocarpa tissues which formed numerous xylem elements (xylogenic) or no xylem (non-xylogenic) were compared. Polyphenol accounted for ca 15% of the dry wt of the cell wall and did not differ significantly in amount in xylogenic and non-xylogenic tissues. The syringic acid derivatives, 3,4.5-trimethoxybenzoic acid, was identified as one of the oxidation products of methylated cell walls and was recovered in similar amounts irrespective of xylem formation. In contrast, lignin from xylogenic cultures contained more p-coumaryl alcohol derivatives and less coniferyl alcohol derivatives than lignin from non-xylogenic cultures. In this respect the lignin composition of xylogenic tissues closely resembled that from stems.
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