N-(3-Indolylacetyl)-L-leucine is a synthetic auxin-amino acid conjugate used primarily in plant biology research. It serves as a model compound for studying auxin metabolism, conjugation, and homeostasis due to its structural similarity to natural indole-3-acetic acid (IAA) conjugates. Employed as a tracer in investigations of auxin synthesis pathways, transport, and degradation in plants. Also utilized in tissue culture protocols to explore root development in cuttings and seedlings, and to examine plant responses to hormonal signals under stress conditions such as drought or salinity. Shows potential in understanding mechanisms of growth regulation and stress tolerance, though not commonly applied directly in large-scale agriculture.