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Brassinosteroid

From Academic Kids

Missing image
BrassinolidII.png
Brassinolid appears to be the most common Brassinosteroid.

Brassinosteroids (BAs) are a group of plant hormones.

Location, Characteristics and Occasions for Synthesis Induction

  • Released in mature cells when they have less than enough sugar and oxygen to support both themselves and any dependent cells
  • Released by all cells when they are experiencing conditions which would normally cause a mature root cell to produce BA or GA
  • Released in response to root environmental, pest, or disease stress

Effects

  • Increased rate of stem elongation
  • Leaf senescence inhibition
  • Involved in gravitropism
  • Bending of grass leaves at the sheath/blade joints
  • Inhibits leaf abscission
  • Inhibits root growth
  • Resistance to stress - just in the shoot. By rerouting resources from the root to the stressed shoot
  • Stimulates cell elongation and division – just in the shoot
  • Enhanced Ethylene production ? – induced indirectly by the causation of root cell senescence
  • Promotion of growth - just shoot growth
  • Xylem differentiation promotion - in order to transfer resources from cannibalized root cells
  • Inhibits the rate of metabolism of cells in the shoot (who are not already at their lowest metabolism rates) in response to an decrease in the levels sugar and/or essential gases


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

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