| Year | Scientist(s) | Discovery | Significance |
|---|---|---|---|
| 1880 | Darwin & Darwin | Coleoptile bends toward light; tip responsible | First evidence of chemical signal in tropism |
| 1910 | Cousins | Ripening of oranges near gas burners | First evidence of ethylene as growth regulator |
| 1926 | Kurosawa | Gibberella fujikuroi causes bakanae disease | Led to discovery of gibberellins |
| 1928 | F.W. Went | Avena coleoptile agar block experiment | Auxin isolated and quantified |
| 1934 | Kögl et al. | IAA purified from human urine | Chemical identity of auxin established |
| 1935 | Kurosawa et al. | Gibberellin substance isolated from fungus | Gibberellin chemistry begins |
| 1954 | Addicott & Carns | Cotton boll abscission compound isolated | Led to discovery of ABA |
| 1955 | Skoog & Miller | Kinetin discovered in herring sperm DNA | First cytokinin identified |
| 1957 | Richmond & Lang | Kinetin delays leaf senescence | Richmond-Lang effect described |
| 1963 | Kögl and Addicott | ABA structure confirmed (same compound) | ABA named and characterized |
| 1963 | Lang et al. | Vernalization mechanism studied in detail | FLC/flowering gene regulation begins |
| 1972 | Murashige | Tissue culture hormone ratios for organogenesis | Practical plant biotechnology established |
| 1985 | Weiler et al. | Phytochrome molecular structure elucidated | Photoreceptor biology advances |
| 2005 | Corbesier et al. | FT protein identified as florigen | Florigen's molecular identity confirmed after 70 years |
| 2008 | Ueguchi-Tanaka et al. | GID1 identified as GA receptor | GA-DELLA pathway fully characterized |
Part of PP-03 — Plant Growth & Development
Timeline: Discoveries in Plant Growth & PGR Biology
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