IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
INTEGRATION OF LIGHT AND HORMONAL SIGNALS IN SEEDLINGS GROWN UNDER SHADE.
Autor/es:
BOTTO JF
Lugar:
Mar del Plata
Reunión:
Congreso; XV Congreso Latinoamericano de Fisiología Vegetal que y la XXX Reunión Argentina de Fisiología Vegetal.; 2014
Institución organizadora:
SAFV
Resumen:
How plants integrate environmental and hormonal signals is a central question in biology. Light is an important environmental signal that provides information to finely modulate plant growth. Plants detect the presence of neighboring plants monitoring the light environment by multiple photoreceptors, including phytochromes and cryptpochromes. In natural environments, the vegetation canopy reduces photosynthetically active radiation, blue and red photons with the decrease of R/FR ratio due to the relative increase in FR light. Plants respond to the reduction of R/FR ratio by the promotion of shade avoidance syndrome (SAS). The SAS are a set of morphological and physiological responses including the elongation of stems and petioles, the reduction of leaf growth and branching, and flowering acceleration. My research group identified a group of zinc-finger transcription factors, called B-Box (BBX) proteins, involved in the SAS.  Some BBX proteins, that contain two B-Box motifs, play opposite functions under shade. For example, BBX24 promotes, while BBX21 inhibits growth under low R/FR ratio. My talk will illustrate about the molecular mechanism by which BBX proteins exert their action modulating hormonal signaling pathways under shade.