Hydrolysed walls in the water-conducting cells of Dendroligotrichum (bryophyta): Histochemistry and ultrastructure.
Histochemical techniques and electron microscopy have been used to investigate the nature of the oblique primary end-walls of the water-conducting cells (hydroids) of Dendroligotrichum dendroides. (Hedw.) Broth. The observed properties (weakly birefringent; IKI-H2SO4-positive; periodic acid/Schiff negative; toluidine blue O-negative) support the conclusion that these end-walls are the cellulose residue of a primary wall that has been hydrolysed during autolysis of the hydroids. The walls are now referred to as hydrolysed end-walls. The unhydrolysed lateral-walls appear to be protected from hydrolytic attack by lignin or a lignin-like compound within those walls. The similarities between the hydrolysed end-walls of the hydroids and the hydrolysed walls of vascular plant tracheary elements are discussed.
Department of Biology, Buckhout Laboratory, The Pennsylvania State University, 16802, University Park, Pennsylvania, USA.
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