Plants naturally produce five major plant hormones (phytohormones) including auxins or indole-3-acetic acid (IAA), cytokinins, gibberellins, abscisic acid and the gaseous hormone, ethylene. It is a combination and balance of these hormones that regulate many aspects of plant growth, development and reproduction. The first three hormones are recognised as being plant growth promoting, whereas abscisic acid and ethylene are considered to be growth inhibitors due to their effect on plant abscission (the shedding away or cutting off of different parts of the plant)
This week, Neutrog’s Microbiologist and R&D Manager, Dr. Uwe Stroeher delves into the science of plant hormones.
Just like animals, plants are dependent on a set of hormones to regulate how they grow. How does a plant know where to grow roots? Why do plants grow at the tips and where along a shoot do leaves come out? All of these processes are regulated by hormones.
Plants growth is essentially regulated by five major hormones that the plants themselves produce, but surprisingly, three are also produced by microbes. Even the way fruit ripens is controlled by a hormone known as ethylene, which is the only know gaseous hormone.