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Phytohormones

1. Auxin
Precursor - Tryptophan (amino acid)
Bioassays - Avena curvature test, root growth inhibition test

2. Gibberellins
Precursor - Acetyl Co-A

Bioassays - Dwarf maize test, dwarf pea test, induction of alpha amylase in barley endosperm test

3. Cytokinins
Precursor - Modified purines derived from tRNA like zeatin (benzyl amino purine), dihydrozeation, isopentyl adenine

Bioassays - Chlorophyll preservation test, tobacco pith culture test, cell division test, expansion of excised radish cotyledon test

4. Ethylene
Precursor - Methionine (amino acid)
Bioassays - Triple response test

5. ABA (Abscisic acid)
Precursor - Violaxanthin
Bioassay - Cotton or Bean explant test

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