Increase of xylan synthetase activity during xylem differentiation of the vascular cambium of sycamore and poplar trees |
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Authors: | G. Dalessandro D. H. Northcote |
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Affiliation: | (1) Istituto di Botanica, Università di Bari, via Amendola 175, I-70126 Bari, Italy;(2) Department of Biochemistry, University of Cambridge, CB2 1QW Cambridge, U.K. |
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Abstract: | The activity of a -(1-4)-xylan synthetase, a membrane-bound enzymic system, was measured in particulate enzymic preparations (1,000 g and 1,000–100,000 g pellets) obtained from homogenates of cambial cells, differentiating xylem cells and differentiated xylem cells isolated from actively growing trees of sycamore (Acer pseudoplatamus) and poplar (Populus robusta). The specific activity (nmol of xylan formed min–1 mg–1 of protein) as well as the activity calculated on a per cell basis (nmol of xylan formed min–1 cell–1) of this enzymic system, markedly increased as cells differentiate from the vascular cambium to xylem. This increase is closely correlated with the enhanced deposition of xylan occurring during the formation of secondary thickening. The possible control of xylan synthesis during the biogenesis of plant cell wall is discussed. |
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Keywords: | Acer Cambial cells Differentiation Populus Xylan synthetase Xylem |
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