Plant growth and Auxins

Edited by Jamie (ScienceAid Editor), Taylor (ScienceAid Editor), Jen Moreau, MaxScience and 2 others


Auxins are plant growth hormones. They work by making cells grow longer, and divide more. A growth reaction to a stimulus is called a tropism, and different prefixes denote what type of stimulus is involved.

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  • Photo- (light)
  • Geo- (gravity)
  • Hydro- (water)

Below is a diagram showing how a phototropism causes the plant to grow in the direction of the sun

The auxin collects on the dark side of the shoot; therefore, more growth will occur on this side of the plant and the shoot will gradually lean toward the sun. Now it can now make the best use of the environment. This effect can be observed with house plants. If you have a plant in a room with only one window, it will often develop more on the side that faces the window.

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Commercial Applications

Plant hormones have many commercial uses relating to agriculture and flower growing. Some are:

  1. 1
    A cutting from a plant can be taken, for example, a branch. If a bit of auxin is applied to the base and this is put in soil, it will grow roots and a clone is made.
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  2. 2
    They can be used to slow down the process of ripening so they arrive fresh after transport.
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  3. 3
    As well as encouraging life, auxin can also be used to destroy it. Applying auxins can make weeds grow too fast and therefore die.
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Questions and Answers

How to use indole acetic acid on tomato productivity and what is the treatment that I will use?

What is the effect of IAA on the fruits of tomato? What is the importance of IAA? The connections between indole-3-acidic corrosive (IAA) diffusing out of the foods grown from the ground among organic products, and amongst leafy foods tips were researched utilizing apple (Malus domestica Borkh. cv. Jonagold) and tomato (Lycopersicon esculentum Mill.) plants. Predominant organic products dependably had more diffusible IAA than subordinated, hindered natural products. Modifications in predominance by natural product or shoot tip evacuation - prompted noteworthy changes in diffusible IAA by the rest of the organic products. This change could be distinguished one day after predominance alteration. It is recommended that diffusible IAA is included in the correlative flag directing predominance connection among organic products, and among foods grown from the ground in apple and tomato.

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IAA has a wide range of impacts, for example, actuating cell prolongation and cell division with every single consequent outcome for plant development and improvement. On a bigger scale, IAA fills in as flagging particle important for the advancement of plant organs and coordination of development.

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Referencing this Article

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APA (American Psychological Association)
Plant growth and Auxins. (2017). In ScienceAid. Retrieved Feb 27, 2024, from

MLA (Modern Language Association) "Plant growth and Auxins." ScienceAid, Accessed 27 Feb 2024.

Chicago / Turabian "Plant growth and Auxins." Accessed Feb 27, 2024.

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Article Info

Categories : Plants

Recent edits by: SarMal, MaxScience, Jen Moreau

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