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| hormone auxins indoleacetic acid (IAA) 2,4-D (2,4-dichlorophenoxyacetic acid) gibberellins cytokinin apical dominance leaf senescence ethylene abscisic acid tropism phototropism shoot apex coleoptiles gravitropism amyloplasts statoliths clinostat thigmotropism nastic movements thigmonasty nyctinasty photoperiodism long-day plants day-neutral plants short-day plants phytochrome Pr Pfr etiolated growth senescence dormant circadian rhythms heliotropism solar tracking |