• Effect of Different Concentrations of IAA (Indole-3-Acetic Acid ) on Root Initiation


• Plant Hormone Science Fair Projects and Experiments


• What is the effect of gibberellic acid on the growth of normal and dwarf pea plants?


• Pea Plants Subjected to Growth Hormone


• History of Auxins and Pioneering Experiments


• Measuring the ripening of unripe fruit induced by the plant hormone ethylene, by monitoring starch levels


• How can I do an experiment that shows plant tropisms and growth hormones


• Some simple experiments to explain the role of phytohormones in plants


• The role of hormones in synchronizing fruit ripening


• The effect of different concentrations of the plant growth substance IAA on the growth of roots and shoots


• The Interactions of Plant Hormones and Rop Proteins


• Hormone-induced Parthenocarpy in Rapid-cycling Brassica rapa


• Abscisic acid in the thermoinhibition of lettuce seed germination and enhancement of its catabolism by gibberellin

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.

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