FOTOMORFOGÉNESIS
• Desarrollo foto y escotomorfogénico
• Fotorreceptores
– Fitocromos
– Criptocromos
– Fototropinas
Transducción de señales por los fitocromos
Ritmo circadiano
COP9-signalosoma
Plant development normally shows plasticity within certain bounds, that is, without falling into extreme phenotypes. The
occurrence of multiple receptors and downstream signalling pathways, negative regulators, and positive and negative interactions
provides the homeostasis that prevents exaggerated phenotypes under extreme environments. This system leaves room for change
because the actual phenotype obtained within the range of normal developmental plasticity can depend on just a few receptors, negative
regulators that establish the need for further environmental cues, and interactions that modulate the relationship between signal input and
output.
Convergencia de la información de los fotones
De-etiolación de una plántula
Plantulas creciendo en distintas condiciones de luz y análisis de la
expresión génica correspondiente mediante microarrays.
CONCEPTO DE FOTOMORFOGENESIS Y
ESCOTOMORFOGENESIS
fotorreceptores de plantas
Dominios en el fitocromo
Luz blanca
Luz Roja
Luz Infrarroja
Luz Azul
Mutantes de fitocromo en Arabidopsis
the network that connects developmental genes to environmental
cues.
Phytochrome photoperception and signal transduction in
seedling photomorphogenesis.
Light-induced nuclear translocation of phyA.
PIF3
PKS1
PKS1 interacts with phytochrome
PKS1 expression
Light-regulated PKS1 phosphorylation by phyA in vitro.
Seedlings overexpressing PKS1 have reduced sensitivity to white light.
Direct targeting of light signals to primary photoresponse genes.
Photons convey information.
Cryptochrome and flowering time
Phot1
Phot1-2
EL CONTROL DEL DESARROLLO
FOTOMORFOGÉNICO
-Sistema de control por degradación
--EL COP9 signalosoma
-COP1
-Componentes del sistema de identificación y
degradación
-Papel del criptocromo cry1
-Control del hy5
La red que conecta los genes del desarrollo con las fluctuaciones
ambientales
Hy5
The light regulation of HY5 is dependent on the nuclear abundance of
COP1 and its ability to interact with COP1.