Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 61, Issue 15, Pages 4221-4230Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erq241
Keywords
BES1; brassinosteroids; BRI1; CPD; DET2; FLC; flowering time; SVP
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Funding
- National Outstanding Youth Foundation of China [30625008]
- Major project of cultivating new varieties of Transgenic organisms
- National Basic Research Program of China (973 Program) [2007CB108905]
- National High Technology Research and Development Program (863 Program) [2007AA021401]
- [2009ZX08009-029B]
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The 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.
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