What is wood in plants?

Wood in plants is characterized by axial and radial structures. In conifers, the axial system consists of tracheids, which provide strength and water conduction. In hardwoods, the axial system is composed of fibers for mechanical function and vessel elements specialized for water conduction. The radial system primarily transports carbohydrates from the inner bark to the wood, with some food-storage cells. Wood is split more easily along the rays because ray cells interrupt the connections of tracheids or fibers. Sapwood is the youngest wood that carries water and nutrients. As a tree ages, the older inner sapwood converts to heartwood , infiltrated by oils, gums, resins, tannins, and other chemical compounds. Heartwood, though dead, provides structural strength and can serve as a water reservoir for the sapwood.

Where is wood found in a plant?

Wood, primarily made of xylem , is a vascular tissue in plants that transports water and minerals from the roots to the rest of the plant while also providing physical support. Xylem is located with pholem in all vascular plants. In woody plants, secondary xylem makes up most of the mature stem or root. Primary xylem cells die as new xylem rings develop, forming a strong, supportive skeleton. Only the outer secondary xylem (sapwood) conducts water, while the inner part (heartwood) consists of dead primary xylem.

What is the main function of wood in a tree?

Wood, a principal tissue in trees, serves to strengthen the plant and conduct nutrients. As xylem tissue, wood's primary function is to convey water and dissolved minerals from the roots to the rest of the tree while also providing physical support. The axial system of wood is composed of cells frequently designed to form tissues for strength and water conduction. The radial system functions primarily in the transport of carbohydrates from the inner bark to the wood. In addition to water and nutrients, wood also stores food.

What types of cells make up wood tissue?

Wood tissue is composed of cells that can be viewed under a microscope. An estimated 350 billion–500 billion cells exist in one cubic meter of spruce wood. The main types of cells are tracheids , vessel members, fibres , and parenchyma . Softwoods consist of tracheids and parenchyma, while hardwoods consist of vessel members, fibres, and parenchyma. Generally, wood cells are dead, with the exception of a few layers of young cells produced during growth and parenchyma cells located in sapwood. Cambium gives rise to wood and bark through division and differentiation of derivative cells.

How does wood help a plant transport water and nutrients?

Wood, specifically the xylem , is vital for transporting water and nutrients in plants. Xylem is a vascular tissue that moves water and dissolved minerals from the roots to the rest of the plant, while also providing physical support. Xylem is made up of specialized cells known as tracheids and vessel members. These cells form rigid tubes that enable water and mineral nutrients to travel from the soil to all parts of the plant. The radial system of the wood also helps move carbohydrates from the inner bark to the wood.

How do annual rings form in wood, and what can they tell us about a tree's age or environment?

Growth rings, commonly called annual rings, are the layers of wood added to a tree's stem during a single growth period. In temperate regions, this period is usually one year, but in tropical regions, rings may not be as clear or annual. These rings form due to differences in cell size and characteristics between early (spring) and late (summer) wood. Environmental factors like water availability also affect growth ring formation. Counting these rings at the base of the trunk can determine a tree's age. The width of the rings reflects past climates, with wider rings indicating favorable conditions and narrower rings suggesting harsh conditions. Dendrochronology, the study of tree rings, uses these rings to date events and analyze past climates. By analyzing ring patterns, scientists can gather information about ancient climates and date old wooden structures.

wood

Introduction
Production and consumption of wood
Harvesting of wood
- Management
- Marking, felling, and processing
Utilization of wood
- Primary products
  - Roundwood products
  - Sawn wood
    - Production at the sawmill
    - Yield and grading
  - Veneer
  - Plywood and laminated wood
    - Plywood
    - Laminated wood
  - Particleboard
  - Fibreboard
  - Pulp and paper
- Treatments
  - Drying
  - Preservation
- Chemical products
  - Products of chemical processing
  - Extractives
Wood as a material
- Structure and composition
  - Macrostructure
    - Earlywood, latewood, and pores
    - Heartwood and sapwood
    - Rays and resin canals
    - Radial and tangential sections
  - Microstructure
  - Ultrastructure and chemical composition
  - Variation of structure and defects
- Properties of wood
  - Sensory characteristics
  - Density and specific gravity
  - Hygroscopicity
  - Shrinkage and swelling
  - Mechanical properties
  - Thermal properties
  - Electric properties
  - Acoustic properties
  - Degradation
Bark and bark products

References & Edit History Related Topics

Images & Videos

temperate softwoods and hardwoods selected to show variations

tropical hardwoods selected to show variations

World map displaying the geographic distribution of forests by wood type, with tropical hardwood forests in light green mainly near the equator, temperate hardwood forests in teal in parts of North America, Europe, and Asia, softwood (coniferous) forests in purple across northern regions, and mixed forests in blue in select temperate zones. Examples of tree species for each category are listed at the bottom of the map.

The energy-saving potential of transparent wood

harvester on a tree plantation in Finland

Edge of a dense forest in Romania where clear cutting has removed most trees, leaving a bare, brown slope beside standing green trees.

band saw breaking a log down into lumber

Illustration showing five basic log-sawing patterns: live sawing, cant sawing, sawing for grade, sawing for radial grain, and sawing for dimension lumber, each with labeled cross-sections of logs and cut lumber pieces.

Illustration comparing two types of plywood: three-ply all-veneer plywood with three thin wood layers, and three-ply lumber core plywood with a thicker central core and thin veneer surfaces.

At a Glance

wood summary

wood

plant tissue

Written by

George Thomas Tsoumis

Fact-checked by

Britannica Editors

Last updated

Oct. 31, 2026 •History

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wood, the principal strengthening and nutrient-conducting tissue of trees and other plants and one of the most abundant and versatile natural materials. Produced by many botanical species, including both gymnosperms and angiosperms, wood is available in various colours and grain patterns. It is strong in relation to its weight, is insulating to heat and electricity, and has desirable acoustic properties. Furthermore, it imparts a feeling of “warmth” not possessed by competing materials such as metals or stone, and it is relatively easily worked. As a material, wood has been in service since humans appeared on Earth. Today, in spite of technological advancement and competition from metals, plastics, cement, and other materials, wood maintains a place in most of its traditional roles, and its serviceability is expanding through new uses. In addition to well-known products such as lumber, furniture, and plywood, wood is the raw material for wood-based panels, pulp and paper, and many chemical products. Finally, wood is still an important fuel in much of the world.

Production and consumption of wood

In botanical terms, wood is part of the system that conveys water and dissolved minerals from the roots to the rest of the plant, stores food created by photosynthesis, and furnishes mechanical support. It is produced by an estimated 25,000 to 30,000 species of plants, including herbaceous ones, though only 3,000 to 4,000 species produce wood that is suitable for use as a material. Wood-producing forest trees and other woody plants are of two categories: gymnosperms and angiosperms. Gymnosperms, or cone-bearing trees, produce softwoods, such as pine and spruce, and angiosperms produce temperate and tropical hardwoods, such as oak, beech, teak, and balsa. It should be noted that the distinction implied by hardwood and softwood is not true in all cases. Some hardwoods—e.g., balsa—are softer than some softwoods—e.g., yew.

Wood is a material of great economic importance. It is found throughout the world and can be sustainably managed as a renewable resource—in contrast to coal, ores, and petroleum, which are gradually exhausted. By means of its harvesting in forests, its transportation, its processing in workshops and industries, and its trade and use, wood provides jobs and supports economic development and, in some countries, basic subsistence. Indicative of this importance is the continued high demand for wood and wood products.

On a weight basis, the consumption of wood exceeds by far that of other materials. More than half of roundwood (log) production is consumed as fuel, mainly in less-developed countries. Production of paper and paperboard has shown the most rapid increase among wood products; this trend is expected to continue as consumption per person in the less-developed countries approaches that in the developed nations. Rising world population is the driving force of increasing consumption of wood and consequent deforestation. The depletion of many forests, especially in the tropics, makes uncertain the provision of an adequate wood supply to satisfy the anticipated need. Efforts to stop the reduction of Earth’s forest cover and increase the productivity of existing forests, establishment of extensive reforestation programs and plantations of fast-growing tree species, recycling of paper, and improved utilization of wood through research could ease the problem of wood supply and help to lessen the environmental toll of the lumber industry.

wood

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Production and consumption of wood

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