Plant Growth regulation hormones
- Created by: vicvicelectric
- Created on: 19-01-14 18:20
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- Growth regulators
- Auxins (separate sheet)
- Cytokinins
- Promote cell division
- Over-rise auxins to promote growth in axillary bud growth
- Delays ageing in leaves - used commercially in lettace
- Pathogens synthesise cyytokinin to grow Galls
- Gibberellins
- work with auxins to promote elongation of stem tissue eg bolting in flowering biennials
- Break Dormancy after H20 absorbs into seed coat / signal germination
- Stimulate RNA to synthesise enzimes that convery starch to sugar for germination
- Effect contered by Absiscic Acid
- stimulate some fruit enlargement
- May counter effect of herbicides
- Abscisic Acid (ABA)
- Promotes seed dormancy
- Dormins (ABA derivative) used in nurserys to initiate dormancy for shipping ( reversed by Gibberellins)
- Promotes ageing in leaves
- Ethylene (separate sheet)
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