Auxins are a group of plant hormones or growth regulators that are naturally produced by plants and exhibit certain traits of morphogenetics. They support cell division, stem and root growth, and are found in the tips of roots and branches. In the course of a plant's life cycle, auxins play a crucial role in coordinating a variety of growth and behavioral activities, including cell division and differentiation, fruit development, cutting root formation, prevention of lateral branching (apical dominance), and defoliation (abscission). They can also greatly influence plant orientation by promoting cell division on one side of the plant in response to sunlight and gravity.
Auxin is a growth-promoting substance that helps in the elongation of shoots. There are four key effects of auxin on plant growth.
However, in high concentrations, auxins can prevent the development of lateral shoots. Auxins have the ability to act as both pesticides and plant growth regulators. The herbicide 2-4-D is a phytochemical-based pesticide that is intended to cause dicotyledonous plants to grow rapidly and uncontrollably, ultimately killing the plant.