Pith

Definition

Pith is the central tissue in stems and roots of vascular plants, primarily composed of parenchyma cells. It functions mainly in storage and transport of nutrients throughout the plant.

5 Must Know Facts For Your Next Test

1. Pith is typically found in the center of dicot stems but may be absent or reduced in monocots.
2. The primary cells making up the pith are parenchyma cells, which are known for their ability to store water and nutrients.
3. In some plants, such as cacti, the pith can become lignified and provide structural support.
4. Pith plays a crucial role in storing starches and other metabolic products that help sustain the plant during periods of dormancy or stress.
5. In young stems, pith is usually soft and spongy, but it can become hollow or disintegrate as the plant matures.

Review Questions

• What type of cells primarily make up the pith?
• How does the role of pith change as some plants mature?
• What functions does the pith serve in vascular plants?

Related terms

Xylem:

Tissue responsible for transporting water and minerals from roots to other parts of the plant.

Phloem:

Tissue that transports sugars and other metabolic products downward from leaves.

Parenchyma Cells: Basic plant cells involved in photosynthesis, storage, and tissue repair; often found in pith.