Plant Hormones and Responses

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Presentation transcript:

Plant Hormones and Responses

Environmental Factors Etiolation (absence of light) Greening (presence of light)

Signal Reception

More complicated ...

Hormones

Hormones

Early Experiments

Discovery of Auxin

Activity of Auxin

Gibberellins

Ethylene Ceneraria leaves rolled in from the sides in response to exposure to ethylene

Normal Ethylene Less Ethylene

Normal Ethylene Less Ethylene

Ethylene & Senescence

Leaf Abscission Protective Layer (suberized) Petiole Separation Layer

Ethylene – Triple Response

Abscisic Acid & Stomata

Plant Tropisms

Phototropism

Gravitropism (aka geotropism)

Thigmotropism

Nastic Movements

Nastic Movements: Action Potentials?

Photoperiodism

Red Light Interuptions

Joined Plants

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