IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Function of BBX proteins in plant light signaling.
Autor/es:
BOTTO JF
Lugar:
Rosario
Reunión:
Congreso; L Reunión Nacional de la SAIB; 2014
Institución organizadora:
Sociedad Argentina de Investigacion en Bioquimica y Biologia Molecular
Resumen:
Plants have evolved sophisticated photosensory systems to respond and
convert the light information into biological signals. After germination,
etiolated seedlings perceive light and promote de-etiolation that includes hypocotyl
inhibition and development of photosynthetic cotyledons. After seedling
establishment, plants grow and become mutually shaded. To increase the chances
to compete for light, sun plants are capable to induce the shade avoidance
syndrome, a group of physiological responses being the most prominent the
elongation of stem and petioles. These developmental processes promote a
massive transcriptional reprogramming finely modulated by the activity of
transcription factors. Here in this
talk, I will describe the functional characterization of a group of zinc-finger
transcription factors that contain a tandem repeated B-boxes (BBX) involved in
seedling de-etiolation and shade avoidance response. In particular, I will
demonstrate the action of BBX24 and BBX25 in both processes. They are negative
regulators of photomorphogenesis and act additively in the control of
de-etiolation through the inhibition of HY5 activity. Furthermore, BBX24 and
BBX25 promote additively cell elongation under shade light. This talk will
present some evidence of BBX protein functions in the shade signaling pathway.