Major plant hormones
- Auxin — cell elongation, apical dominance
- Cytokinin — cell division, shoot meristem activity
- Gibberellins — stem elongation, seed germination
- ABA — stress response, seed dormancy
- Ethylene — fruit ripening, senescence
- Brassinosteroids — growth, stress tolerance
Cross-talk
Hormones interact — shade (low R:FR) elevates auxin and reduces BR signaling, promoting elongation. Understanding networks guides precision agriculture and breeding.