Ch. 13.6 Control of Plant Growth and Development

Plant growth regulator: a chemical produced by plant cells that regulates growth and differentiation

Plants can modify their growth and differentiation through plant growth regulator

• act by signaling plant cells to undergo particular changes

• auxins, gibberellins, cytokinin, ethylene, and abscisic acid

Tropisms and Plant Growth Regulators

Tropism: a directional change in growth/ movement in response to a stimulus

Phototropism: a change in direction of a growing plant in response to light

Gravitropism: a directional change in growth pattern in response to gravity

Thigmotropism: a directional change in growth pattern in response to touch