The tigellum is the embryonal axis of a seed.
Understanding the Tigellum
The tigellum is a crucial component of a plant embryo, serving as the main axis from which other parts develop. It's essentially the structure that connects the future root and shoot of the plant.
Key Characteristics of the Tigellum
- Embryonal Axis: It forms the central axis of the embryo.
- Extent: It spans from the plumule to the radicle.
- Radicle End: This end of the tigellum is rod-shaped and is referred to as the radicle, which will develop into the root system.
- Plumule End: The other side of the tigellum is the plumule, positioned between the two cotyledons, and it gives rise to the shoot of the plant.
Importance of Tigellum
The tigellum's function is critical for the development of a new plant:
- Initiates Growth: It initiates the growth of the plant by developing both root and shoot.
- Foundation: It provides the basic structure for the plant's axis.
- Nutrient Transport: Through the tissues that develop from the tigellum, nutrients and water are transported between root and shoot.
Tigellum: Quick Breakdown
| Feature | Description |
|---|---|
| Definition | The embryonal axis of the seed |
| Function | Connects the plumule and radicle, forming the central axis of the embryo |
| Radicle End | Rod-shaped; develops into the root system |
| Plumule End | Located between cotyledons; develops into the shoot |
Example
Imagine a seed that has just germinated. The first part of the plant to emerge is the radicle, developing from one end of the tigellum. Simultaneously, the plumule develops from the other end and pushes upward to form the shoot. This demonstrates the tigellum's pivotal role in the development of the seedling.
