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Abscisic acid

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ABAII.png
Abscisic Acid was given its name because it was once thought to be pivotal in leaf abscission.

Abscisic Acid is a plant hormone.

Location, Characteristics and Occasions for Synthesis Induction

  • Released during desiccation
  • Has been found to peak at night
  • Synthesized in green fruit and seeds at the beginning of the wintering period
  • As well as moving within the leaf it can be transferred to the leaf from the roots by the transpiration stream
  • Rapidly translocated
  • Produced in response to stress
  • Synthesized in leaves and stems (particularly when water stressed)
  • Released by cells in danger of not having enough nutrients locally or good enough environmental conditions to survive
  • All cells capable of synthesizing

Effects

  • Stimulates stomatal closure
  • Fruit ripening inhibition
  • Encourages seed dormancy by inhibiting cell growth – inhibits seed germination
  • ABA inhibits the uptake of Kinetin
  • Pathogen resistance response defense -
  • Induces senescence in already damaged cells and their proximate neighbors
  • Quickly puts a plant, organ, tissue or individual cell in a defensive posture (whatever this entails) in response to rapidly developing nutrient or environmental stress that threaten their survival
  • Decreases metabolism in response to a newly developing deficiency of nutrient or adverse environmental condition, such that condition becomes survivable at the new lower level of metabolism (Not true in Theory II)
  • Possibly induces cell dormancy or senescence by a climactic increase or sustained level stimulating the synthesis of GA and/or Ethylene (Not true in Theory II of plant hormones)
  • A climactic rise or sustained level of ABA may be a prerequisite for the synthesis of any GA and/or Ethylene in that it presence indicates unusable or unsurvivable levels of Water, Sugar, Minerals and/or essential gases (Not true in Theory II)


Plant hormones edit (http://en.wikipedia.org/w/wiki.phtml?title=Template:Plant_hormones&action=edit)

Auxins - Cytokinins - Ethylene - Gibberellins - Abscisic acid - Brassinosteroids - Jasmonates - Salicylic acid

de:Abscisinsure

ja:アブシジン酸

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