Hydraulic and anatomical properties of light bands in Norway spruce compression wood

January 2006
Tree Physiology;Jan2006, Vol. 26 Issue 1, p17
Academic Journal
Compression wood (CW), which is formed on the underside of conifer branches, exhibits a lower specific hydraulic conductivity (ks) compared with normal wood. However, the first-formed tracheids of an annual ring on the underside of a conifer branch often share several properties with normal tracheids, e.g., thin cell walls and angular cross sections. These first-formed tracheids appear bright when observed by the naked eye and are therefore called light bands (LB). In this study, hydraulic and related anatomical properties of LBs were characterized and compared with typical CW and opposite wood (OW). Measurements were made on branches of Norway spruce (Picea abies (L.) Karst.). Specific hydraulic conductivity was measured with fine cannulas connected to microlitre syringes. Micro- and ultrastructural analysis were performed on transverse and radial longitudinal sections by light and scanning electron microscopy.


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