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How do parenchyma cells store and transport food in wood?
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wood
Temperate softwoods (left column) and hardwoods (right column), selected to highlight natural variations in colour and figure: (A) Douglas fir, (B) sugar pine, (C) redwood, (D) white oak, (E) American sycamore, and (F) black cherry. Each image shows (from left to right) transverse, radial, and tangential surfaces. Click on an individual image for an enlarged view.
In wood, parenchyma cells are specialized, brick-shaped living cells that play a vital role in the storage and transport of nutrients. Their functions are organized based on their orientation within the wood structure:1
- Storage: Parenchyma cells are primarily responsible for the storage of food, such as carbohydrates. These cells remain alive in the sapwood, where they maintain their metabolic activity even as other surrounding wood cells die.21
- Transport: Parenchyma cells facilitate the movement of substances, particularly in a horizontal direction. This is primarily the role of radial parenchyma, which forms the wood rays that transport carbohydrates from the inner bark into the wood. While axial parenchyma is also present in many species, the radial system is specifically noted for its role in this horizontal distribution.13
These cells are distinct from the water-conducting tracheids and vessel members, providing a necessary division of labor within the plant's vascular tissue.31