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How do resin canals function in conifer wood?
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conifer
A giant sequoia (Sequoiadendron giganteum) estimated to be between 1,900 and 2,400 years old, Grizzly Giant is the oldest tree in the Mariposa Grove, Yosemite National Park, California.
Resin canals, also known as resin ducts, are tubular intercellular spaces found within the wood of certain conifers, such as pine, spruce, larch, and Douglas fir.12
These structures function as specialized channels lined with epithelial cells—a type of living parenchyma—that secrete resin into the canal. While they are not cells themselves, they serve as a system for the production and transport of resin within the plant's stem. In a transverse section of wood, these canals appear as small dark or whitish dots. As the tree matures and sapwood is transformed into heartwood, these canals typically become plugged.3142