Define phenotypic plasticity.
A measure of the extent to which genetically identical organisms may differ due to environmental causes.
Describe the mechanisms of plant response (3 things)
1. perception: detects a stimulus, activates a messenger molecule
2. Transduction: converts perception into action
3. Response: changes in phenotype (growth, physiology)
2. Transduction: converts perception into action
3. Response: changes in phenotype (growth, physiology)
Name 3 different types of tropism.
Phototropism = response to light
gravitroprism = response to gravity
thigmotropism = response to touch
autotropism = orientation of other organs
gravitroprism = response to gravity
thigmotropism = response to touch
autotropism = orientation of other organs
Where is phototropism located?
Stem tips. Growth regulator auxin is transported down and away from light.
Where is gravitropism located?
Root tips. Auxin produced in shoot, travels to root tip, redistributes, regulates cell elongation.
List the 8 growth regulators.
Include major functions.
Include major functions.
1. auxins
- phototropism
2. cytokinins
- overcome apical dominance
3. ethylene
- induce fruit ripening
4. abscisins
- proote stomatal closure
5. gibberrelins
- induce seed germination
6. brassinosteroids
- reduce stress
7. systemin
- signals wounding has occured
8. salicylic acid and jasmonic acid
- perceive/response to herbivores
- phototropism
2. cytokinins
- overcome apical dominance
3. ethylene
- induce fruit ripening
4. abscisins
- proote stomatal closure
5. gibberrelins
- induce seed germination
6. brassinosteroids
- reduce stress
7. systemin
- signals wounding has occured
8. salicylic acid and jasmonic acid
- perceive/response to herbivores
