Journal
ANNUAL REVIEW OF GENETICS, VOL 46
Volume 46, Issue -, Pages 701-724Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-genet-102209-163450
Keywords
signal transduction; receptor kinase; chloroplast; stomata; signal cross talk; gibberellin
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Funding
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM066258] Funding Source: NIH RePORTER
- NIGMS NIH HHS [R01 GM066258, R01GM066258] Funding Source: Medline
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In plants, the steroidal hormone brassinosteroid (BR) regulates numerous developmental processes, including photomorphogenesis. Genetic, proteomic, and genomic studies in Arabidopsis have illustrated a fully connected BR signal transduction pathway from the cell surface receptor kinase BRI1 to the BZR1 family of transcription factors. Genome-wide analyses of protein-DNA interactions have identified thousands of BZR1 target genes that link BR signaling to various cellular, metabolic, and developmental processes, as well as other signaling pathways. In controlling photomorphogenesis, BR signaling is highly integrated with the light, gibberellin, and auxin pathways through both direct interactions between signaling proteins and transcriptional regulation of key components of these pathways. BR signaling also cross talks with other receptor kinase pathways to modulate stomata development and innate immunity. The molecular connections in the BR signaling network demonstrate a robust steroid signaling system that has evolved in plants to orchestrate signal transduction, genome expression, metabolism, defense, and development.
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