cambium

/'kæmbiəm/

Thân thiện

The student examines the cambium layer in a tree cross-section.

Definition

1. Noun:
   • A layer of actively dividing cells in vascular plants: In botany, cambium is a thin layer of formative tissue between the xylem and phloem in the stems and roots of most vascular plants. It is responsible for producing new cells, leading to secondary growth (increase in girth or thickness).

Examples of Usage

• Noun:
  • The cambium is essential for the tree's growth in diameter.
  • Damage to the cambium layer can severely harm a plant.

Advanced Usage

• "Vascular cambium": The specific type of cambium that produces secondary xylem (wood) and secondary phloem (inner bark).
  • The vascular cambium is a lateral meristem.
• "Cork cambium" (or phellogen): A related meristematic layer in plants that produces cork cells.
  • The cork cambium forms the protective outer bark.

Variants and Related Words

• Cambial (adj): Pertaining to or of the nature of cambium.
  • Cambial activity is highest during the growing season.

Synonyms

• Meristem (in a broader sense): Plant tissue consisting of undifferentiated cells capable of division and growth.
• Formative layer: A descriptive term for its function.

Notes on Different Meanings

• The primary and most common meaning of "cambium" is in the field of botany, as defined above.
• In anatomy, it can historically refer to a formative layer, such as the inner layer of the periosteum, but this usage is now rare and specialized. The botanical definition is overwhelmingly dominant.

Học thuật

Noun

1. the inner layer of the periosteum
2. a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth