Home > Brassinosteroid

1 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

2 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
• (From Theory II of plant hormones): 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