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Annals of Botany 72: 441-448, 1993
© 1993 Annals of Botany Company

The Structure and Composition of Bead-like Projections on Sitka Spruce Callus Cells Formed during Grafting and in Culture

Helen Miller and J. R. Barnett

Department of Agricultural Botany, School of Plant Sciences, University of Reading, Whiteknights, P.O Box 221, Reading, RG6 2AS, UK

Projections at the cell wall surface in callus formed at the graft interface and in vitro in Picea sitchensis (Bong.) Carr have been examined using light and electron microscopy. These structures range in size from 1 to 5 µm in diameter, and consist of a homogeneous matrix enclosing one or more fibrillar/vesicular cores. Histochemical and cytochemical studies have shown that the homogeneous matrix is made up of a mixture of pectins, carbohydrate, protein and fatty acids, while the fibrillar/vesicular component is mainly carbohydrate and pectins. The possible functions of these structures are discussed on the bases of their composition.Copyright 1993, 1999 Academic Press

Picea sitchensis, callus, cell-wall projections, histochemistry, cytochemistry


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