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As the compound had the capability of the elongation of the coleoptile region the compound was named Auxin from the Greek auxin, meaning “to increase” or “to grow.”Īll the auxins have indole rings in their structure. He also observed that when these blocks were placed on the decapacitated coleoptile regions they had the capacity to cause bending in absence of the light source. Went allowed the chemical to diffuse out in the gelatin blocks. In 1926, Frits Went reported the presence of chemicals responsible for the growth of the coleoptile in the tip of oat Avena sativa coleoptile. But, the region responsible for the bending of the coleoptile is called growth is located several millimetres below the coleoptile region, hence Darwin concluded that some kind of signal is produced in the tip region which diffuses to the growth zone and causes the bending of the coleoptile. Darwin found that the tip of the coleoptile perceived the light but when covered with foil the coleoptile would not bend.
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The foundation for the discovery of auxins dates back to the 19 th century when Charles Darwin and his son Francis Darwin were studying the bending of the coleoptile region of grass ( Phalaris canariensis) towards the light a phenomenon popularly known as phototropism. Generally, about five naturally occurring plant hormones are present in plants which are as follows:Īuxin is the very first hormone discovered in plants. In this article, we will talk about the different naturally occurring plant hormones and their function in plant growth and metabolism. These chemical messengers in plants are particularly termed Phytohormones. The first idea of such chemical signal molecules in plants originated in the 19 th century with German scientist Julian Von Sachs. Similar to the mammalian system plants also produce chemical signals to maintain homeostasis between growth, morphogenesis and regulation of metabolic processes. This communication is achieved because of specific molecules known as hormones. In complex organisms like mammals to keep all the cellular as well as physiological processes going, communication between cells, tissues and organs is of paramount importance.