Function of B - BOX proteins under shade

Plants are capable of perceiving changes in the light environment and finely adjust their growth and development. Reductions of red to far-red ratio [R:FR] generated by an increase of the plant canopy above the plant are sensed by the phytochrome system triggering the shade-avoidance syndrome [SAS] that includes elongation of vegetative structures, reduction of branching and acceleration of flowering. Albeit the SAS is a strategy of major adaptative significance in plant communities, involving massive changes in gene expression, our knowledge of the SAS signaling network is still fragmented. By a selection and characterization of a T-DNA mutant with a long hypocotyl under shade, we identified BBX21, a protein with two B-box domains involved in the SAS. BBX21 belongs to a small eight member family of B-box containing proteins with both opposite and additive functions in the SAS signaling. BBX21 down-regulates the gene expression of auxin, brassinosteroid and ethylene signaling pathway components under shade. Furthermore BBX21 is a transcription factor that interacts genetically with COP1. We propose a model in which a dynamic balance of positive and negative B-box transcriptional regulators acts as a gas-and-brake mechanism into the COP1 signaling to regulate the expression of SAS.

Bibliographic Details

Main Authors:	Crocco, Carlos Daniel, Holm, Magnus, Yanovsky, Marcelo J., Botto, Javier Francisco
Format:	Texto biblioteca
Language:	eng
Subjects:	BRASSINOLIDE, CHOLESTANOL, ETHYLENE, ETHYLENE DERIVATIVE, HETEROCYCLIC STEROID, INDOLEACETIC ACID DERIVATIVE, VEGETABLE PROTEIN, CHEMISTRY, DARKNESS, DOWN REGULATION, GENE EXPRESSION REGULATION, GENETICS, GROWTH, DEVELOPMENT AND AGING, METABOLISM, PHENOTYPE, PLANT, PROTEIN TERTIARY STRUCTURE, SIGNAL TRANSDUCTION, CHOLESTANOLS, DOWN-REGULATION, ETHYLENES, INDOLEACETIC ACIDS, PLANT PROTEINS, PLANTS, PROTEIN STRUCTURE, TERTIARY, STEROIDS, HETEROCYCLIC,
Online Access:	http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46525 http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber= http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber= http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber= http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber= http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=
Tags:	Add Tag No Tags, Be the first to tag this record!