Involvement of brassinosteroid signals in the floral-induction network of Arabidopsis.
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.
Li
Jihong
J
Key Laboratory of Arid and Pasture Agroecology of Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China.
Li
Yuhua
Y
Chen
Shuyan
S
An
Lizhe
L
D017360:Arabidopsis / Q000502:physiology*; D053898:Biosynthetic Pathways; D060406:Brassinosteroids; D002777:Cholestanols / Q000378:metabolism*; D035264:Flowers / Q000502:physiology*; D015398:Signal Transduction; D013260:Steroids, Heterocyclic / Q000378:metabolism*; D013997:Time Factors
D060406:Brassinosteroids; D002777:Cholestanols; D013260:Steroids, Heterocyclic; C023623:brassinolide