Ethylene is a volatile gaseous compound that stimulates transverse growth but retards longitudinal growth.
- Cousins confirmed its presence in ripened oranges, that hastened the ripening of stored unripe bananas.
- Formed in all parts of the plant i.e., roots, leaves, flowers, seeds.
- Maximum synthesis occurs in ripening fruits & tissues undergoing senescence.
- Synthesized from Methionine.
- Excess of auxin induces synthesis of ethylene.
- Biologically active at low concentration.