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Salicylic acid (plant hormone)

From Academic Kids

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The Plant Hormone Salicylic Acid is similar in structure to that of Aspirin's.

Here is a list of some of salicylic acid's properties when acting as a plant hormone. It is interesting to note, in light of these properties, that there is a popular belief that cut flowers will last longer if aspirin (acetylsalicylic acid) is dissolved in their water.

Location, Characteristics and Occasions for Synthesis Induction

  • Cells returning from water stress
  • Released by cells secure in having more than enough nutrients and environmental conditions locally to survive at its current metabolic level
  • All cells capable of synthesizing
  • Has its effect or acts by rapid local increases followed by rapid decreases in levels

Effects

  • Retards senescence (regulatory role) – probably by inhibiting Ethylene biosynthesis
  • Induces flowering
  • Inhibits seed germination – by inhibiting ABA synthesis
  • May also block the wound response and act antagonistically to ABA – preventing the wound response from spreading further than necessary
  • After a survival threat has passed SA quickly removes a plant, organ, tissue or cell from a defensive posture and returns it to normal functioning
  • Increases cell metabolism rate to take advantage of new complete more advantageous nutrient and environmental conditions
  • A climactic or sustained level of SA may occur if a cell has reached its peak metabolic levels and may signal that a plant's resources can be turned to growth
  • This climactic or sustained level of SA may be a prerequisite for the synthesis of Auxin and/or Cytokinin, because only then does a plant know that it has enough resources to turn them to growing bigger
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:Salicylsäure

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