Indoleacetic acid/Temp
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Indoleacetic acid is a plant hormone. Here is a list of some of its charateristics.
Location, Characteristics and Occasions for Synthesis Induction
- Synthesized in shoot and root meristematic tissue
- Synthesized in young leaves
- Synthesized in mature leaves in very small amounts
- IAA peaks during the day
- Synthesized in mature root cells
- Released by meristematic cells when they have enough sugar and oxygen to support both themselves and any dependent cells and are in good growing conditions
- Released by all cells when they are experiencing conditions which would normally cause a shoot meristematic cell to produce Auxin.
- Directly or indirectly induced by high levels of Ethylene
Effects
- Stimulates cell elongation
- Stimulates cell division with CK
- Induces xylem and phloem
- Directly stimulates Ethylene synthesis
- IAA inhibits Ethylene formation and transport of precursor
- Induces shoot apical dominance
- Inhibits abscission prior to formation of abscission layer (inhibits senescence of leaves)
- Involved in phototropism, gravitropism, tropism toward moisture
- Induces sugar and mineral accumulation at the site of application
- Flower initiation
- Sex determination
- Induces xylem and phloem
- Induces new root formation by breaking root apical dominance induced by CK
- Inhibits root hair growth and causes them to die back
- (From Theory II of plant hormones) Stimulates the rate of metabolism of cells in the root (who are not at their peak metabolism rates) in response to an increase in the levels sugar and essential gases.