IAL   21557
INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Class I transcription factors modulate thermomorphogenesis in coordination with the master regulator PIF4 in Arabidopsis?.
Autor/es:
FERRERO, LUCÍA V; GONZALEZ, DANIEL H; VIOLA, IVANA L; ARIEL, FEDERICO D
Lugar:
Buenos Aires
Reunión:
Congreso; Latin American Society for Developmental Biology Meeting; 2019
Institución organizadora:
Latin American Society for Developmental Biology
Resumen:
Temperature is a key environmental signal resulting in adaptive modulation of growth and development. Plants respond to a rise in ambient temperature by increasing the elongation of petioles and hypocotyls. TCP transcription factors are exclusive to plants and are mainly involved in the regulation of developmental processes and hormone responses. In this work, we show that two closely related class I TCP proteins, TCP14 and TCP15, are required for optimal petiole and hypocotyl elongation under high ambient temperature. These TCPs affect the levels of the DELLA protein RGA and the expression of several growth-related genes that are induced in response to an increase in temperature. Some of the genes regulated by TCP15 are PIF4 targets and many of the genes in this group contain TCP binding motifs in their promoters, suggesting that PIF4 and the TCPs jointly target them. We found that TCP15 directly regulates the GA biosynthesis gene GA20ox1 and at least two PIF4 targets intimately involved in the promotion of cell elongation, HBI1 and PRE6. Moreover, PIF4 binding to GA20ox1 and HBI1 is reduced in the absence of the TCPs, suggesting that the interaction of class I TCPs with these genes is functional in promoting PIF4 association. In addition, overexpression of HBI1 rescues the growth defects of tcp14 tcp15 double mutants, indicating that this gene is a major outcome of regulation by both class I TCPs during thermomorphogenesis.