lenticel

Thân thiện

Definition

Noun: A lenticel is a small, corky, usually lens-shaped pore on the bark of stems and roots of woody plants. It functions as a pathway for the direct exchange of gases (such as oxygen and carbon dioxide) between the internal tissues of the plant and the external atmosphere.

Usage

Lenticels are visible as slightly raised, often rough spots or lines on the surface of bark. They are essential for respiration in woody plants after the stomata in the original epidermis are lost as the bark develops.

Examples

• The smooth bark of the cherry tree is marked with distinctive horizontal lenticels.
• Botanists study lenticels to understand gas exchange in perennial plants.
• The lenticel density on a stem can vary with environmental conditions.

Advanced Usage

• Lenticel Hypertrophy: An abnormal enlargement or proliferation of lenticels, often caused by waterlogged soil conditions or certain pathogens.
• Lenticel Blotch: A disorder in some fruits, like apples, where the areas around lenticels become discolored.

Variants and Related Words

• Lenticellate (adj): Having or characterized by the presence of lenticels.
  • The lenticellate bark of the birch tree is easily recognizable.

Synonyms

• Pore (specifically in the context of plant anatomy for gas exchange).
• Breathing pore (a descriptive synonym).

Notes

While similar in function to stomata, lenticels are structurally different. Stomata are primarily found on leaves and herbaceous stems and can open and close, whereas lenticels on woody stems are always open and are part of the periderm (bark).

Học thuật

Noun

1. one of many raised pores on the stems of woody plants that allow the interchange of gas between the atmosphere and the interior tissue