BRAINCAKEAuxins
Auxins are a group of plant growth regulators. The main natural auxin is indoleacetic acid (IAA).
IAA is made in the meristems at the tips of shoots and roots and in young leaves. It moves away from the tip by diffusion and by active transport from cell to cell, and over longer distances in the phloem. It mainly acts in the zone of elongation just behind the tip.
Effects of auxins
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Key terms in this lesson
- plant growth regulator
- A chemical made in plant cells that alters growth or development, often at very low concentration and away from where it was made.
More in Chemical Control
- Second Messenger System
- Plant Stimuli
- Plant Responses
- Plant Growth
- How Auxins Work
- Gibberellins
- Cytokinins
- Synergy and Antagonism
All 30 lessons in Chemical Control · All Edexcel A-level Biology topics