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Involvement of brassinosteroid signals in the floral-induction network of Arabidopsis Li J; Li Y; Chen S; An LJ Exp Bot 2010[Oct]; 61 (15): 4221-30The transition to flowering is known to be regulated by numerous interacting endogenous and environmental cues, of which brassinosteroids (BRs), a group of polyhydroxylated steroid phytohormones, appear to be linked to the regulation of flowering time. In Arabidopsis, BR biosynthetic det2 mutants exhibited delayed flowering time by at least 10 d compared with the wild type. The levels of endogenous BRs in det2 were below 10% of the wild type. The timing of flowering was also delayed in the BR biosynthetic dwf4 and cpd mutants and in the BR-insensitive bri1 mutants. Because brassinolide (BL) and different BL precursors were over-accumulated in BR biosynthetic mutants and BR-insensitive bri1 mutants, this showed that alterations in the endogenous BL content and the level of different BL precursors affect flowering time in Arabidopsis. The late-flowering phenotypes of bri1 also showed that components of the BR signal transduction pathway affect flowering time. So far, reports on a connection between BRs and flowering time are limited. This review summarizes recent advances regarding the action of BRs in the transition to flowering.|*Signal Transduction[MESH]|Arabidopsis/*physiology[MESH]|Biosynthetic Pathways[MESH]|Brassinosteroids[MESH]|Cholestanols/*metabolism[MESH]|Flowers/*physiology[MESH]|Steroids, Heterocyclic/*metabolism[MESH]|Time Factors[MESH] |
