bio213 chapter 393 chapter 29 plant hormones

What is the general plant response pattern?

1. Event happens

2. Cell notices

3. Cell processes inro

4. Cell does something

What is an example of plant response?

When plant is exposed to light, stem will bend towards the source

What are plant hormones?

Signaling molecules that allow one part of plant to communicate with one another

What is a simple explanation for hormones?

A message

What are the 5 plant hormones?

1. Auxi

What is Auxin?

Promotes cell elongation, reacts to light

• When light exposure only happens on one side or the plant, cells will elongate on the shaded side of the plant

• Stem bends towards light

What is phototropism?

Plant stem bending towards light

What is cytokinin?

Produced primarily in root tips and travel upwards

• Stimulates cell division

• Promotes branching

• Produced in actively growing tissues (e.g., roots, embryos, fruits)

What is gibberellic?

Stimulates stem elongation

• Promotes seed germination

• Promotes fruit growth

What is abscisix Acid (ABA)?

Drought hormone→ closes stomata

• Helps plants conserve water

• Maintains seed dormancy

• Slows growth

What is Ethlylene?

Ripening hormone→ fruit ripening

• Produced in response to stress (drought, flooding, mechanical pressure, injury)

• Leaf drop

What is thigmotropism?

Growth in response to touch

What are physical defenses?

Thorns, spines, tough tissues

What are chemical defenses?

Toxins, bitter compounds