INVESTIGADORES
MUSCHIETTI Jorge Prometeo
artículos
Título:
Phytochrome control of Arabidopsis transcriptome anticipates seedling exposure to light.
Autor/es:
MAZZELLA, MARIA AGUSTINA; ARANA, VERONICA; STANELONI, ROBERTO; PERELMAN, SUSANA; RODRIGUEZ, MARIA; MUSCHIETTI, JORGE; CERDAN, PABLO; CHEN, KUNHUAN; SANCHEZ, RODOLFO; ZHU, TONG; CHORY, JOANNE; CASAL, JORGE
Revista:
PLANT CELL
Referencias:
Año: 2005 vol. 17 p. 2507 - 2516
ISSN:
1040-4651
Resumen:
Phytochromes mediate a profound developmental shift when dark-grown
seedlings are exposed to light. Here, we show that a subset of genes is
upregulated in phytochrome B (phyB) mutants even before dark-grown
Arabidopsis thaliana seedlings are exposed to light. Most of these
genes bear the RY cis motif, which is a binding site of the
transcription factor ABSCISIC ACID INSENSITIVE3 (ABI3), and the phyB
mutation also enhances ABI3 expression. These changes in transcriptome
have physiological consequences, because seedlings of the abi3 mutant
showed enhanced responses to pulses of far-red light, whereas ABI3
overexpressers exhibited the opposite pattern. Seedlings of the wild
type derived from seeds germinated in full darkness showed enhanced
expression of genes bearing the RY cis motif and reduced responses to
farred light. We propose that, via changes in ABI3 expression, light,
perceived mainly by phyB in the seed, generates a downstream
transdevelopmental phase signal that preconditions the seedling to its
most likely environment.