There are five major classes of plant hormones
(a.k.a. Plant growth regulators
(Pgr's)) with perhaps a few others as candidates to take that place in the future. The five major hormone classes are Auxins, Cytokinins(CK’s), Ethylene
, Gibberellins (GA’s), and Abscisic Acid (ABA). Recently it has been suggested that Brassinosteroids (BA’s), Jasmonates (JA’s), Salicylates (SA’s), and Polyamines
are new classes of major hormones.
See also: Hormone
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