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Hormones and Signal Transduction
•Katerina Dadakova, Department of Biochemistry
•Figures adopted from Buchanan et al., Biochemistry & molecular biology of plants

Hormones and Signal Transduction
Signal transduction


Hormones and Signal Transduction
Signal perception
Symplast
•RNA
•transcription factors
Apoplast
Plasma mebrane receptors
Intracellular receptors
•ethylene
•auxin
•gibberellin
•light
G-protein-coupled receptors
Ion channels
Receptor
kinases
•brassinosteroids

Hormones and Signal Transduction
Second messengers


Hormones and Signal Transduction
MAPK cascades and Phytohormones
Monooxygenase
By Jmol Development Team/Briana Miller - Jmol, GPL,
https://commons.wikimedia.org/w/index.php?curid=15026248

Hormones and Signal Transduction
Gibberellins
Effect of GA3 on stem elongation.
left: control plant
right: plant 7 days after treatment with GA3

Hormones and Signal Transduction
Abscisic acid


Hormones and Signal Transduction
Cytokinins
Transgenic plants AtCKX have lower CK content compared to wild-type.
The two-component system

Hormones and Signal Transduction
Auxin


Hormones and Signal Transduction
Ethylene
Left: Fruits, which generate about 5 % of normal amount of ethylene. Right: Fruits, which produce
normal amounts of ethylene.

Hormones and Signal Transduction
Brassinosteroids
Wild-type and BL-defficient Arabidopsis plant

Hormones and Signal Transduction
Polyamines


Hormones and Signal Transduction
Jasmonic acid and Salicylic acid
Necrotic lesions on the leaf of tobacco

Hormones and Signal Transduction
Strigolactones


Hormones and Signal Transduction
Plant photoreceptors
Phytochromes