What Is The Role Of Auxins In Plants – Discover what auxin is and where auxin is produced in plants. Understand the importance of auxin as a plant hormone and its function. Updated: 02/25/2022

Auxins are a group of plant hormones responsible for regulating cell elongation and growth, among other requirements. Auxin also regulates cell differentiation, cell division and healing in vascular tissues, signals roots to start growing in asexually propagated plants, and is also responsible for the timing of flower reproduction.

What Is The Role Of Auxins In Plants

Auxin affects plant growth in a variety of ways. In shoots, the accumulation of auxin in cells indicates cell elongation. Whereas the accumulation of auxin in plant roots indicates a cell that is not growing.

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Auxin is a plant hormone responsible for plant cell elongation, cell differentiation, cell division and healing in nerve cells, flowering time, and overall balanced growth of the entire plant.

Auxin is a plant hormone. Auxin is responsible for regulating certain processes such as cell elongation, and flower production in plants.

Plants have many of their functions regulated by plant hormones. Plant hormones act as chemical signals that control the development of plant cells, tissues, and organs. Additionally, they also direct the plant’s responses to its environment by regulating movement and growth. Plants respond to their environment by changing and adjusting their cells, tissues and organs.

One of the first plant hormones to be discovered was a hormone called auxin. The word “auxin” is derived from the Greek word auxein which means “to grow”. But what exactly is auxin? And where is auxin produced? A simple or broad auxin definition is a group of plant hormones responsible for regulating cell elongation and growth, among other things related to similar needs. There are different types of auxins for these different functions. The most common auxin in plants is indole-3-acetic acid or IAA.

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Auxin is produced by the auxin-producing regions of the plant, such as the apical meristem, which produces the most auxin. The apical meristem is also the main structural part of the plant from which other plant organs such as leaves, stem parts, roots and flowers all grow. Auxin is produced in the cells of the apical meristem and transported to the tissues and cells around the apical meristem, signaling these cells to grow. Areas with low auxin concentrations are temporarily stunted.

Auxins are produced by certain environmental factors or stimuli. A plant’s response to environmental stimuli is called tropism. There are several different types of fungi, which are actively regulated by auxin.

There are several types of heat, or responses to stimuli by plants. The main functions regulated by auxin are phototropism and gravitropism. Phototropism is a plant’s response to light as a stimulus and gravitropism is a plant’s response to gravity as a stimulus.

When a plant is just sprouting from a seed under soil and hidden from sunlight, the plant senses the direction of gravity and grows away from it. If a plant needs to adjust its direction, such as when facing an obstacle or starting to grow sideways, auxin regulates the change of direction by accumulating cells on one side of the plant’s stem or root. However, auxin modulations signal different things in branches (eg stems and leaves) than in roots.

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This diagram illustrates how auxin accumulation in roots and shoots signals different cell elongation responses.

Accumulation of auxin on one side of the plant stem will signal the cells of that side to elongate while the other side remains. This causes the top of the plant, or stem, to move away from the side that collected the auxin. This process is fundamentally different. The side that accumulates auxin in the roots is indicated for growth, while the side that does not have auxin in the roots is indicated for elongation.

It is useful for plants to respond to light stimuli. The sun, the plant’s source of energy and food, does not stay in the same position in the sky throughout the day. Therefore, it is beneficial for the plant to orient itself to the changing position of the sun because it always absorbs the best amount of sunlight during the day. This arrangement and rearrangement is due to phototropism regulated by auxin. Auxin at the top of the stem will accumulate on the shady side of the plant, stimulating elongation and causing re-potting.

Auxin also plays a role in the growth of branches or laterals along the plant stem. Auxin accumulates toward the top of the plant stem as the plant grows and matures. This causes lateral buds near the stem of the plant to grow faster, and buds closer to the base to grow more slowly. This effect is called apical dominance. Apical dominance is why gardeners often cut off the tops of their plants. This automatically reduces the accumulation of auxin in the wound and slows the growth of the plant in height. This then encourages further bud growth which causes the plant to grow taller before it grows. This in turn increases flower and fruit production, as the number of branches increases and therefore the surface area for them to grow.

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Auxins can also be synthesized in the laboratory or produced artificially. These synthetic auxins are often used as herbicides. Herbicides kill certain plants. 2, 4-D and 2, 4, 5-T are herbicides that are often used to target weeds in yards because they do not kill grasses or monocotyledons. Synthetic auxin works by binding to auxin receptors in plant cells, which results in a few things. Uncontrolled growth can disrupt processes such as protein synthesis and cell division. This can impair cell wall plasticity and plant metabolism.

Additionally, auxin is used in a methodology that promotes parthenocarpy. This process expands the plant’s seeds and forces the plant to grow fruit. Because the process did not involve asexual or sexual reproduction, the fruit will not produce seeds. This method is used to produce products such as seedless tomatoes and seedless watermelons.

If you watch a plant grow over time, you’ll see it grow up, out and down. The stem grows, the plant grows taller. Leaves grow outwards, reaching for sunlight. Roots grow downward, absorb nutrients and stabilize the soil.

But what refers to the part of the plant that grows this way? Just like your body, plants have different hormones, and auxin is a special group of hormones that make plant cells grow. Auxins are not only important for plant growth, but they were also the first class of plant hormones to be discovered. A Dutch graduate student named Frits Went first described auxins in 1926 and chose the name auxin from the Greek word ‘auxien’, meaning ‘to grow’.

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Auxins are a group of plant hormones primarily responsible for regulating cell elongation and growth, among other functions. Auxin comes from the Greek word auxein which means “to grow”. The apical meristem is the part of the plant that is responsible for producing most of the plant’s auxin. It works in conjunction with other hormones to balance plant growth and healing.

Auxin is the primary hormone that regulates temperature, or response to environmental stimuli. Phototropism is a plant’s response to light. The lack of light on one side of the plant signals auxin to accumulate and stimulate cell elongation, pointing the stem toward the sun. Auxin also regulates gravitropism or the plant’s response to gravity. There are also synthetic auxins or auxins made in the laboratory, which are used industrially as herbicides. Additionally, auxin can be used in fruit plants to stimulate ovary development and seedless fruit production.

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The main function of auxin is to make plants grow. Auxin stimulates plant cells to elongate, and the plant apical meristem is one of the main sites where auxin is produced. This makes sense because the apical meristem is also where all the other parts of the plant grow from the stem, leaves and flowers.

Auxin not only elongates cells, but it elongates them specifically in response to the environment. In response to light, the auxin will elongate the cells on the dark side of the stem so that the plant is actually exposed to the light source. This is called phototropism, and it allows the plant to photosynthesize as much as possible, which is important because photosynthesis is how plants make food from light.

Auxin also lengthens root cells underground, while simultaneously lifting cells in the stem.

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