Radicle

Definition

The radicle is the embryonic root of a plant that emerges from the seed during germination. It is the first part of a seedling to grow and anchors the plant in the soil while absorbing water and nutrients.

5 Must Know Facts For Your Next Test

1. The radicle is crucial for the initial absorption of water, which triggers further growth processes in the seedling.
2. Upon germination, the radicle grows downward due to gravitropism, helping establish the plant's root system.
3. The development of the radicle marks a key stage in seed germination and successful plant reproduction.
4. The length and health of the radicle can directly affect a young plant’s ability to gather nutrients from the soil.
5. In dicotyledons, the radicle gives rise to a primary root, while in monocotyledons it may be replaced by adventitious roots.

Review Questions

• What role does the radicle play in seed germination?
• How does gravitropism affect radicle growth?
• What happens if a seed's radicle is damaged or unhealthy?

Related terms

Plumule: The part of a plant embryo that will develop into the shoot bearing leaves.

Cotyledon: The first leaf or pair of leaves produced by an embryo of a seed plant.

Hypocotyl: The stem-like part of a seedling below the cotyledons and above the root system that pushes up through soil during germination.