Brassinosteroids - Catawba County Schools
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Transcript Brassinosteroids - Catawba County Schools
By: Adam Cline, Macy Franklin, Jared Davis, and
Kerigan “K-Money” Farley
Molecular Formula
Background Info
Similar to cholesterol and sex hormones in animals
Present in all plant tissues
Internally produced and act near site of synthesis
Origin
Pollen, seeds, and most other plant tissues
produce brassinosteroids
Where it starts
Intracellular reception starts the phosphorylation of
the steroid
Where is stops
In the nucleus where it attaches and turns on the gene
that promotes plant growth
Functions
Promotes cell expansion and division shoots
Root growth at low concentrations
Stops root growth at high concentrations (negative
feedback)
Promotes xylem differentiation and inhibit phloem
differentiation
Promotes seed germination and pollen tube elongation
So similar to auxins that it took years to determine they
were not just types of auxins
Flow Chart
Signal
Transduction
The steroid binds to the
intracellular BR1 Kinase and
starts the phosphorylation
cascade.
Series of events occur that lead to
transcription factors that turn on
specific genes.
Response
This gene that produces a protein
that promotes cell growth in the
roots, leaves, and stems of the
plant. It will also increase plant
production.