Abscisic acid (ABA) is the plant hormone that promotes dormancy in seeds and buds.
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Abscisic acid (ABA) is the plant hormone that promotes dormancy in seeds and buds. This hormone plays a crucial role in regulating the growth and development of plants, particularly during periods of stress or unfavorable conditions.
According to a renowned botanist, Peter Raven, “Abscisic acid is like the ‘sleep hormone’ of plants, signaling them to enter a dormant state until conditions improve.” This quote emphasizes the role of ABA in inducing dormancy as a survival mechanism for plants.
Here are some interesting facts about abscisic acid and its effect on dormancy:
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Seed Dormancy: Abscisic acid prevents the germination of seeds under unfavorable conditions, such as drought or extreme temperatures. It inhibits the growth of the embryo and maintains a state of dormancy until conditions become suitable for germination.
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Bud Dormancy: When winter approaches, many plants enter a period of dormancy to protect themselves from the harsh weather. Abscisic acid accumulates in the buds, causing them to enter a dormant state where growth is inhibited until spring. This helps plants conserve energy and survive through challenging seasons.
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Environmental Signals: ABA synthesis and accumulation are triggered by various environmental signals, including water deficiency, low temperature, and high salinity. These signals activate specific genes, leading to the production of abscisic acid and subsequently promoting dormancy in seeds and buds.
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Stress Response: Apart from regulating dormancy, abscisic acid also acts as a stress hormone in plants. It plays a crucial role in the plant’s response to stress by closing stomata, reducing water loss, and enhancing tolerance to drought, cold, and other adverse conditions.
To illustrate further, here is a table summarizing the effects of abscisic acid on seeds and buds:
| Effect | Seeds | Buds |
|---|---|---|
| Germination | Inhibited | N/A |
| Dormancy | Induced | Induced |
| Growth Inhibition | Yes | Yes |
| Environmental Cues | Water deficiency, temperature | Low temperature, photoperiodic |
In conclusion, abscisic acid serves as the key hormone in promoting dormancy in both seeds and buds. It acts as a signaling molecule that prepares plants for unfavorable conditions and ensures their survival until more favorable circumstances arise. This adaptive mechanism highlights the remarkable resilience of plants in adapting to changing environments.
Watch a video on the subject
This YouTube video discusses the roles of different plant growth hormones. It explains that abscissic acid is responsible for inducing seed dormancy, while gibberilin helps in relieving that dormancy. Auxin and cytokinin promote plant growth, with auxin leading to root formation and cytokinin leading to shoot formation. When equal amounts of auxin and cytokinin are present, a callus is formed. The video also highlights that ethylene is responsible for inducing flowering and senescence. This information emphasizes that plant hormones have diverse roles beyond their main functions.
Other responses to your question
Abscisic acid (ABA)Abscisic acid (ABA) is the sole plant hormone known to maintain seed dormancy; it acts through a gene expression network involving the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3).
Abscisic acid (ABA) promotes seed and bud dormancy by inhibiting growth. It is one of the most important plant’s growth regulators. ABA also plays an important role in the closure of stomata in plants under water stress and its presence inhibits opening.
Abscisic acid (ABA) is a general plant-growth inhibitor. It induces dormancy and prevents seeds from germinating; causes abscission of leaves, fruits, and flowers; and causes stomata to close.
These topics will undoubtedly pique your attention
Subsequently, What hormone promotes bud dormancy? The reply will be: abscisic acid (ABA)
Phytohormones including abscisic acid (ABA), gibberellin (GA), ethylene (ET), auxin and cytokinins (CKs) are involved in bud dormancy, of which ABA plays an essential role in this process [24].
What is the plant hormone for seed dormancy? Answer: Abscisic acid is one of the major plant hormones involved in many aspects of plant growth and developmental processes including seed dormancy and germination.
Besides, What causes bud dormancy? As a response to this: Bud dormancy is an inactive state, wherein most of the physiological activities slow down. It is to avoid stress and extreme environmental conditions such as heat, drought, cold, etc. Once the favorable conditions are restored, the growth resumes. Abscisic acid is the phytohormone that maintains bud dormancy.
Furthermore, Does Gibberellins promote bud and seed dormancy? 3. Gibberellins‐mediated control of seed dormancy release and germination. A high level of gibberellins (GA) is needed for the counteraction of ABA activity in seeds. GA promotes seed dormancy release and radical protrusion during seed germination.
Likewise, Which plant hormone promotes seed dormancy and causes stomata closure? So, according to the question, plant hormone which promotes seed dormancy, bud dormancy, and causes stomata closure is abscisic acid. Abscisic acid: It is also known as stress hormone. – It acts as a plant growth inhibitor and inhibitor of plant metabolism. – It inhibits the seed germination.
Also, What are plant hormones?
Answer: Plant hormones are chemical compounds present in very low concentration in plants. They are derivatives of indole (auxins), terpenes (Gibberellins), adenine (Cytokinins), carotenoids (Abscisic acid) and gases (Ethylene). These hormones are produced in almost all parts of the plant and are transmitted to various parts of the plant.
In respect to this, What are Phytohormones in plants? The answer is: Phytohormones are chemical compounds present in very low concentrations in plants. They regulate plant development, growth, longevity and reproductive processes. Here, let’s look at the structure and functions of different phytohormones like auxins, gibberellins, cytokinins, ethylene and abscisic acid. What is Plant Hormones?
Hereof, What is the role of ABA in seed dormancy?
It is one of the most important plant’s growth regulators. ABA also plays an important role in the closure of stomata in plants under water stress and its presence inhibits opening. Seed dormancy is defined as a state in which seeds are prevented from germinating even under environmental conditions normally favorable for germination.
Considering this, Which plant hormone promotes seed dormancy?
The response is: The plant hormone which promotes seed dormancy is one of the most important plant growth regulators. The plant growth regulators or PGRs are small, simple molecules having different types of chemical composition. They could have indole derivatives, adenine derivatives, and derivatives of carotenoids, terpenes or gases.
What are plant hormones & growth regulators?
The response is: Plant hormones and growth regulators are chemicals that affect: Flowering. Aging. Root growth. Distortion and killing of organs. Prevention or promotion of stem elongation. Color enhancement of fruit. Prevention of leafing, leaf fall or both. Many other conditions. Very small concentrations of these substances produce major growth changes.
Do plant hormones affect seed germination?
The answer is: Among their other functions, the effects of plant hormones on seed germination may be one of their most important functions in plant growth. Hence, in the following such effects are discussed with respect to proteomic and molecular biology studies, with a view toward prospects for future research. 2. Seed germination
Also, What factors affect seed germination and dormancy? In reply to that: Seed germination and dormancy are important processes affecting crop production. These processes are influenced by a range of factors, including plant hormones. Plant hormones, produced by both plants and soil bacteria, can significantly affect seed germination.