Plant hormone

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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.

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[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.

[edit] Classes of Plant Hormones

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

  1. auxins
  2. cytokinins(CKs)
  3. ethylene
  4. gibberellins (GAs)
  5. abscisic acid (ABA)

[edit] See also

[edit] External links

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