Definition - What does Auxins mean?
Auxins are a family of plant hormones that are primarily involved in regulating plant growth, especially the elongation of cells in plants. They are found is all types of plants, not just cannabis. In fact, auxins were the first plant hormones to be discovered and studied in the era of Charles Darwin.
In addition to the elongation of cells, auxins also effect the roots and shoots of a plant, depending on the ratio of auxins to cytokinins, another type of plant hormones. More specifically, a high auxin concentration in the shoot can cause the shoot's cells to grow faster, but a high auxin concentration in the root can cause the cells in the shoots to grow slowly.
This is because the basic flow of auxins within a plant is from the growth tips down through the phloem and toward the root tips. The effects of the auxins are lowest at the top of the plant and higher at the roots.
Hydrolife explains Auxins
Among the many types of auxins in the auxin family of plant hormones, Indole-3-Acetic Acid (IAA) is the most influential natural plant auxin, followed by IBA (Indole-3-Butyric Acid).
Knowing how auxins affect cannabis plants, and where auxins are primarily found within the plant, can help growers manipulate the way in which their plants grow. For example, removing the top growth tip or bud, which removes the IAA that that area of the marijuana plant was producing, gives the lower bud nodes room to multiple and develop larger. (This technique to called pinching-off, but in practice sharp objects should be used to remove the top growth tip, rather than pinching fingers.)
Auxins are a primary ingredient in some rooting hormone products that are commercially available through hydroponics shops. Since IAA is not suitable for long-term packaging storage, the majority of commercial rooting hormone products contain either IBA or a synthetic auxin, such as NAA (1-Naphthaleneacetic Acid).
It is important to note that some synthetic auxins are used as herbicides. Oddly enough, these auxins cause the plant to have a rapid, uncontrollable growth spurt. The plant can not keep up and eventually dies.
There are five classic types of hormones: auxins, cytokinins, gibberellins, ethylene and abscisic acid, with new classes still being discovered and synthesized.