BRAINCAKEPlant Hormones
- Auxins produced at the tops of roots and shoots cause cell elongation, prevent leaf abscission, maintain apical dominance, control tropisms and stimulate the release of ethene for fruit ripening.
- Gibberellins cause stem elongation, the breaking of dormancy and the use of food stores during germination and pollen tube growth during fertilisation.
- Ethene causes fruit ripening and leaf fall.
- ABA (abscisic acid) maintains dormancy, stimulates antifreeze production and stomatal closing in response to abiotic stress.
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Key terms in this lesson
- apical dominance
- The inhibition of the growth of lateral (side) shoots by auxin produced in the apical shoot tip.
- tropism
- A directional growth response of a plant towards or away from a directional stimulus such as light or gravity.
More in Plant Responses
- Plant Growth Responses
- Seed Germination
- Apical Dominance
- Gibberellins: Synergy and Antagonism.
- Leaf Loss
- Flowering and Day-Length
- Preventing Freezing
- Stomatal Control
All 19 lessons in Plant Responses · All AQA A-level Biology topics