Plant hormones (or plant growth regulators, or PGRs) are internally-secreted chemicals in plants that are used for regulating the plants' growth. According to a standard definition, plant hormones are signal molecules produced at specific locations, occur in low concentrations, and cause altered processes in target cells at other locations.

It is accepted that there are five major classes of plant hormones:

1. auxins
2. cytokinins(CK’s)
3. ethylene
4. gibberellins (GA’s)
5. abscisic acid (ABA)

Additional suggested hormone classes:

1. brassinosteroids (BA’s)
2. jasmonates (JA’s)
3. salicylates (SA’s)
4. polyamines are major classes.
5. florigen

See also

• Hormone

External links

• The Top Plant Hormone (Non-Theory) Site on The Web
• Another Good Site
• A Start at a General Plant Hormone Theory
• Sidwell Friends Plant Hormone Table - The Inspiration of the Plant Hormone Tables in Wikipedia and in the Article Above
• Hormonal Regulation of Gene Expression and Development - Detailed Intro Including Genetic Information

Plant hormones | Organic chemistry

Fytohormon | Plantehormon | Phytohormone | Kasvihormoni | Phytohormone | 植物ホルモン | Plantenhormoon | Rastlinné hormóny