Question:
______ is the primary precursor of Indole-3-acetic acid
______ is the primary precursor of Indole-3-acetic acid
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Auxins like IAA regulate plant growth and are mainly synthesized from tryptophan, which is converted into indole-3-pyruvic acid and then to IAA.
Updated On: Jun 19, 2026
- Tryptophan
- Valine
- Tyrosine
- Phenylalanine
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The Correct Option is A
Solution and Explanation
Step 1: Understanding IAA.
Indole-3-acetic acid (IAA) is a principal auxin in plants, responsible for regulating cell elongation, apical dominance, and other growth processes.
Step 2: Biosynthesis pathway.
- IAA is synthesized primarily from the amino acid Tryptophan through several pathways, including the indole-3-pyruvic acid pathway.
- Other amino acids such as valine, tyrosine, and phenylalanine do not serve as primary precursors of IAA.
Step 3: Conclusion.
Hence, Tryptophan is the main precursor for the biosynthesis of Indole-3-acetic acid in plants.
Indole-3-acetic acid (IAA) is a principal auxin in plants, responsible for regulating cell elongation, apical dominance, and other growth processes.
Step 2: Biosynthesis pathway.
- IAA is synthesized primarily from the amino acid Tryptophan through several pathways, including the indole-3-pyruvic acid pathway.
- Other amino acids such as valine, tyrosine, and phenylalanine do not serve as primary precursors of IAA.
Step 3: Conclusion.
Hence, Tryptophan is the main precursor for the biosynthesis of Indole-3-acetic acid in plants.
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