Senescence

Definition

Senescence is the process of aging in plants, where cells and tissues degrade over time. It results in the eventual death of certain parts or the entire plant, impacting reproduction and survival.

5 Must Know Facts For Your Next Test

1. Senescence can be triggered by environmental factors such as drought, nutrient deficiency, or seasonal changes.
2. Hormones like ethylene and abscisic acid play a significant role in initiating senescence in plants.
3. During senescence, plants often recycle nutrients from aging tissues to younger ones, aiding new growth.
4. Leaf senescence is closely related to chlorophyll breakdown, resulting in yellowing leaves.
5. Senescence can affect asexual reproduction by reducing the overall vitality and reproductive capacity of the plant.

Review Questions

• What are some environmental triggers that can initiate senescence in plants?
• Which hormones are primarily involved in the regulation of plant senescence?
• How does leaf senescence manifest visually in most plants?

Related terms

Apoptosis: A programmed cell death process essential for removing damaged or unnecessary cells.

Ethylene: A plant hormone that regulates various processes including fruit ripening and senescence.

Abscission: The process where plants shed leaves, flowers, or fruits typically following senescence.