Indole-3-acetic acid (IAA)
is the most common naturally occurring plant hormone of the auxin class. In plant tissue culture, "Plant Culture Tested" IAA is used to regulate fundamental growth processes such as cell division, elongation, and organogenesis.
Role in Plant Tissue Culture
Unlike synthetic auxins (like NAA or 2,4-D), IAA is the endogenous hormone plants produce themselves. In 2026, it remains essential for:
• Root Induction: Stimulates the formation of adventitious roots in micropropagation.
• Apical Dominance: Regulates the growth pattern of shoots.
• Callus Differentiation: Often used in combination with cytokinins to promote the differentiation of cells into specific organs.
• Somatic Embryogenesis: Facilitates the development of embryos from somatic cells.
"Plant Culture Tested" Specification
Products labeled "Plant Culture Tested" (e.g., HiMedia TC061 or Sigma I2886) meet specific 2026 laboratory standards:
• High Purity: Typically ≥98%
• Biological Efficacy: Verified to promote growth in plant cell cultures without phytotoxicity.
• Contaminant Free: Tested for the absence of heavy metals and other impurities that could inhibit delicate explants.
Stability and Handling (Crucial)
IAA is notably more labile (unstable) than synthetic auxins:
• Light Sensitivity: It is highly photosensitive and degrades rapidly when exposed to light. Stock solutions and media containing IAA should be stored in amber bottles or kept in the dark.
• Heat Sensitivity: IAA is partially degraded during autoclaving. For precise 2026 research protocols, it is recommended to filter-sterilize IAA and add it to the autoclaved medium after it has cooled to approximately 45–50°C.
• Solubility: Insoluble in water. It must be dissolved in a small amount of 1N NaOH or 95% Ethanol before diluting with distilled water.
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