Name , Biosynthetic pathway, Synthesis location, Basic physiologicalactivity
1- Auxin fromtryptophan or indol leaf primordia, young leaves, and developing fruits inductionof longation growth; differentiation of phloem elements; apical dominance;tropisms;initiation of root formation; etc.
2- Cytokinins biochemicalmodification of adenine root tips, young leaves, and developing seeds controlof cell division; bud development; development of the leaf blade; senescenceretardation;
3- Gibberellins from glyceraldehydes-3-phosphate young shoot tissues anddeveloping seeds stem elongation; initiation of seed germination
4- Ethylenefrom methionine stressed tissues and maturing fruits senescence induction;initiation of defensive responses
5- ABA fromcarotenoides roots and expanded leaves control of the stomatal apparatusfunction; growth inhibition; seed dormancy
6- Polyamines bydecarboxylation of arginine or ornithine various tissues regulation of growthand development at micromolar concentrations
7- Brassinosteroids from mevalonic acid various tissues control of division, growthby elongation, differentiation of the vascular system
8- Jasmonides (oxilipins) from polyunsaturated fatty acids various tissues development ofdefensive responses
9- Salicylatesfrom phenylalanine various tissues induction of the complex of defensiveresponses during pathogenesis
10- Signal peptides from amino acids various tissues initiation of defensiveresponses; identification of self-imcompatibilit