Transcriptional programs related to phytochrome a function in arabidopsis seed germination

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In Arabidopsis seeds, germination is promoted only by phytochromes, principally phytochrome B [phyB] and phytochrome A [phyA]. Despite the abundant information concerning the molecular basis of phyB signaling downstream of PIF1/PIL5, the signaling network inducing germination by phyA is poorly known...

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Detalles Bibliográficos
Otros Autores: Ibarra, Silvia Elizabeth, Auge, Gabriela Alejandra, Sánchez, Rodolfo Augusto, Botto, Javier Francisco
Formato: Artículo
Lenguaje:Inglés
Materias:
ARABIDOPSIS SEEDS
GERMINATION
LIGHT
PHYTOCHROME A [PHYA]
PHYTOCHROME B [PHYB]
PIF1/PIL5
TRANSCRIPTOME
ARABIDOPSIS PROTEIN
BASIC HELIX LOOP HELIX TRANSCRIPTION FACTOR
GIBBERELLIN
PHYTOCHROME A
PHYTOHORMONE
PIL5 PROTEIN, ARABIDOPSIS
T DNA
T-DNA
TRANSCRIPTION FACTOR
ARABIDOPSIS
CYTOLOGY
ENZYMOLOGY
GENE EXPRESSION PROFILING
GENETIC TRANSCRIPTION
GENETICS
METABOLISM
MUTATION
PHYSIOLOGY
PLANT SEED
SIGNAL TRANSDUCTION
ARABIDOPSIS PROTEINS
DNA, BACTERIAL
PLANT GROWTH REGULATORS
SEEDS
TRANSCRIPTION FACTORS
TRANSCRIPTION, GENETIC
BACTERIAL DNA
BASIC HELIX-LOOP-HELIX TRANSCRIPTION FACTORS
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2013ibarra.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a In Arabidopsis seeds, germination is promoted only by phytochromes, principally phytochrome B [phyB] and phytochrome A [phyA]. Despite the abundant information concerning the molecular basis of phyB signaling downstream of PIF1/PIL5, the signaling network inducing germination by phyA is poorly known. Here, we describe the influence of phyA on the transcriptome of Arabidopsis seeds when germination is induced by a far-red [FR] pulse. The expression of 11percent of the genome was significantly regulated by phyA. Most of the genes were up-regulated and the changes noted late [i.e. 5 h after a FR pulse], whereas changes in down-regulated genes were more abundant earlier [i.e. 0.5 h after a FR pulse]. Auxin- and GA-associated elements were overrepresented in the genes that were modified by phyA. A significant number of genes whose expression was affected by phyA had not been previously reported to be dependent on PIL5. Among them, homozygotic mutant seeds of MYB66, a SAUR-like protein, PIN7, and GASA4 showed an impaired promotion of germination by phyA. Natural variation at the transcriptional level was found in early signaling and GA metabolic genes, but not in ABA metabolic and expansin genes between Columbia and Landsberg erecta accessions. Although phyA and phyB/PIL5 signaling pathways share some molecular components, our data suggest that phyA signaling is partially independent of PIL5 when germination is promoted by very low fluences of light. 
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