NDLI: Signal-transduction pathways toward the regulation of brassinosteroid biosynthesis

Content Provider	Springer Nature Link
Author	Choe, Sunghwa
Copyright Year	2007
Abstract	Brassinosteroids (BRs) collectively refer to the steroidal plant hormones that stimulate dramatic growth by cells and organs. Because of their essential roles, mutants that are defective in either the biosynthetic or signaling pathway exhibit severe dwarfism. Numerous reports from biochemical, genetic, and physiological studies agree thatDWARF4 mediates the flux-determining step in the biosynthetic pathway. Rather than exercising allosteric feed-back regulation of the enzyme by the end product brassinolide, transcriptional control of theDWF4 gene is considered the most important for precise modulation of the pool size for bioactive BRs.DWF4 expression is localized to actively growing tissues, including shoot and root tips, and the junction tissues between inflorescences and roots. This expression is significantly down-regulated by exogenous or endogenous applications of BRs, but increased by auxin treatment. Direct measurement of the endogenous BRs in different tissues ofArabidopsis has demonstrated that the accumulated BRs are mainly attributable toDWF4 expression. Regarding their interaction with other hormones, BRs induce many auxin-associated genes, e.g., Aux/IAA, GH3, and SAUR. Therefore, it is likely that the brassinosteroids synthesized by a limited number of tightly controlled cells in actively growing tissues are responsible for the demands by those tissues. Future research should elucidate which portion of the BRs is transported via which mechanisms, as well as reveal the roles of auxin-associated genes expressed in a BR-dependent manner.
Starting Page	225
Ending Page	229
Page Count	5
File Format	PDF
ISSN	12269239
Journal	Journal of Plant Biology
Volume Number	50
Issue Number	3
e-ISSN	18670725
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arabidopsis brassinolide cytochrome P450 homeostasis rice Plant Sciences Plant Breeding/Biotechnology Plant Genetics & Genomics Plant Systematics/Taxonomy/Biogeography Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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