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Summary Plant physiology: Plant hormones
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Summary of all the subject matter that is available for the plant hormones chapter for the course 'plant physiology' at KU Leuven.
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Summary Plant physiology – Emile Vancoppenolle1. Introduction
2. Transport in plants
a. Transport introduction
b. Transport biophysics
c. Xylem
d. Phloem
3. Plant hormones
a. Gibberellins (GAs)
i. Introduction
- Tetracyclic diterpenes
- Dominant ones are GA1, GA3, GA4 and GA7
- Promotes stem elongation!
ii. Biosynthesis
- Each terpene consist of C5H8 backbone: isopentenyl diphosphate (IPP)
- Starting block is geranylgeranyl diphosphate made in chloroplasts
, - 4 classes of enzymes regulate GA synthesis from geranylgeranyl diphosphate:
KO and KAO are CYP proteins which take place in the E.R.
- C12 is further modified into different bioactive GA’s in the cytosol:
iii. Transport
- GA12 is the mobile, transportable gibberellin. Found in xylem and phloem
, iv. Signal transduction
- GID1: gibberellin insensitive dwarf 1
o GA receptor located in the nucleus
o DELLA is a negative regulator of GA responses (growth&development) by
binding transcription factors. When GID1 is bound to a GA, it will bind
DELLA which will then be ubiquitinated by the SCF complex. Proteasome
complex will degrade DELLA and thus the GA response will be
activated/stimulated. SPY (=SPINDLY) will glycosylate DELLA to stabilize /
activate it.
v. Physiology
- Photomorphogenesis
- Stem elongation
- Flower induction
- Parthenocarpic fruit (without seeds)
- Break seed dormancy
- …
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