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Indole‐3‐acetic acid (IAA) is a predominant form of active auxin in plants. In addition to de novo biosynthesis and release from its conjugate forms, IAA can be converted from its precursor indole‐3‐butyric acid (IBA).
The IBA‐derived IAA may help drive root hair elongation in Arabidopsis thaliana seedlings, but how the IBA‐to‐IAA conversion is regulated and affects IAA function requires further...