Plant hormone

From Wikipedia, the free encyclopedia

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, that occur in very low concentrations, and cause altered processes in target cells at other locations.

1 Characteristics
2 Classes of Plant Hormones
3 See also
4 External links

[edit] Characteristics

The concentration of hormones required for the plant response is very low(10^-6 to 10^-5M), comparing with the requirement of minerial and vitamin for plants.
The synthesis of plant hormones is more diffuse and not always localized.
Action at a distance is not a must for a plant hormone.