Plant development Flashcards
What is the role of auxin?
Phototropism and gravitropism. Involved in controlling internode length. Stimulates root initiation. Branching Cell expansion (tropism) Cell division (root growth) Differentiation (xylem development) Promotes synthesis of ethylene
What is the role cytokinin?
Helps prevent senescence
Initiates shoot growth
What happens if the ratio of auxin is higher than cytokinin?
Root development
What happens if ratio of auxin and cytokinin is equal?
Callus development
What happens if ratio of auxin is lower than cytokinin?
Shoot development
What are plant cells described as?
Totipotent
What could cause cancer in plants?
agrobacterium tumefacious causes crown galls disease
Name the environmental factors that affect plant development
Light Water Carbon dioxide Touch Herbivores Pathogens
When would absisic acid be synthesised?
When the plant is water deficient
What is controlled by stomata?
transpiration and carbon dioxide intake for calvin cycle in photosynthesis
What are the closing stimuli for stomata guard cells?
Absisic acid and high concentration of carbon dioxide
What are the opening stimuli for stomata guard cells?
Red and blue light
auxin
low concentration of carbon dioxide
What are the effects of ethylene?
Effects fruit ripening and promotes leaf absission
What happens when a plant is water deficient?
Absisic acid is synthesised and released which is then transported to the leaves which makes the stomata close
What happens when plants regain turgor (pressure)
absisic acid synthesis is stopped so the stomata re open and photosynthesis can continue
