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Explore the intricate world of plant hormones and responses to environmental factors such as light. From etiolation in the absence of light to greening in the presence of light, discover how plants perceive signals and respond. Delve into early experiments that led to the discovery of auxin, gibberellins, and ethylene. Learn about the complex interactions between ethylene and senescence, leaf abscission, and protective layers. Uncover the role of abscisic acid in stomatal regulation and the fascinating phenomenon of plant tropisms including phototropism, gravitropism, and thigmotropism. Get insights into nastic movements, photoperiodism, red light interruptions, and the intriguing behavior of plants when joined together.
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Environmental Factors Etiolation (absence of light) Greening (presence of light)
Ethylene Ceneraria leaves rolled in from the sides in response to exposure to ethylene
Normal Ethylene Less Ethylene
Normal Ethylene Less Ethylene
Leaf Abscission Protective Layer (suberized) Petiole Separation Layer