Indol3ethanesulfonic

Indol-3-ethanesulfonic acid (IES) is an organic compound with the chemical formula C11H13NO5S. It is a derivative of indole, a bicyclic aromatic organic compound, and is commonly used in biochemical and agricultural research. IES is notable for its role as a plant growth regulator, particularly in promoting root growth and improving nutrient uptake in plants.

The compound was first synthesized in the early 20th century and has since been studied for its effects on plant physiology. Unlike synthetic auxins, such as 2,4-dichlorophenoxyacetic acid (2,4-D), IES is considered a natural plant growth regulator because it mimics the effects of endogenous indole-3-acetic acid (IAA), a key plant hormone involved in cell elongation, differentiation, and root initiation. IES is often used in hydroponics and soil-based agriculture to enhance plant development, particularly in nutrient-deficient conditions.

In biochemical applications, IES is sometimes employed as a precursor in the synthesis of other indole-based compounds. Its sulfonic acid group contributes to its solubility in water, making it useful in aqueous-based formulations. While generally considered safe for plants, proper dosage is essential, as excessive application may lead to phytotoxicity or stunted growth.

IES is typically available as a white to off-white crystalline powder and is stable under normal storage conditions. It is often supplied as a salt, such as its sodium or potassium form, to improve solubility and compatibility with other fertilizers. Research on IES continues to explore its potential in sustainable agriculture and plant biotechnology.