A seed pore, also known as a micropyle, is a tiny opening or pore found in the seed coat of a plant seed. It plays a crucial role in the initial stages of seed development and germination.
Seed Coat and Micropyle
The seed coat is the protective outer covering of a seed. It consists of two layers: the outer testa and the inner tegmen. The micropyle is specifically located above the hilum, which is a scar on the seed coat showing where the seed was once attached to the fruit.
Key Features of the Micropyle
| Feature | Description |
|---|---|
| Location | Found above the hilum on the seed coat. |
| Size | Very small, typically a minute pore. |
| Function | Allows water absorption during germination and enables the entry of the pollen tube during fertilization. |
Functions of the Micropyle
- Water Absorption: The micropyle is the primary entry point for water to enter the seed during the germination process. This initial water uptake, known as imbibition, is essential for the seed to swell and begin metabolic activity.
- Pollen Tube Entry: During fertilization, the pollen tube enters the ovule (which develops into the seed) through the micropyle, allowing the sperm to fertilize the egg.
Example
- Think of the micropyle as the "keyhole" that allows water and vital parts to enter the seed for the plant to grow. Without the micropyle, water absorption would be severely limited, and the seed might not be able to germinate successfully.
In summary, the micropyle is a small, but essential, pore in the seed coat that facilitates water uptake and allows the entry of the pollen tube, making it critical for both seed development and germination.
