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2015 ; 10
(12
): e1082700
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Sugar-induced plant growth is dependent on brassinosteroids
#MMPMID26340221
Zhang Y
; He J
Plant Signal Behav
2015[]; 10
(12
): e1082700
PMID26340221
show ga
Sugars, the end products of photosynthesis, not only fuel growth and development
of plants as carbon and energy sources, but also function as signaling molecules
to modulate a range of important processes during plant growth and development.
We recently found that sugar can promote hypocotyl elongation in Arabidopsis in
darkness and this is largely dependent on brassinosteroids (BRs), a group of
essential phytohormones involved in mediation of plant cell elongation. Sugars
not only positively regulate the transcription of BZR1, the gene encoding the
BR-activated transcription factor BRASSINAZOLE RESISTANT1 (BRZ1), but also
stabilize the BZR1 protein. Based on these results, we proposed that BZR1 may act
as a converging node for crosstalk between BR and sugar signaling in regulating
plant growth in darkness. In this short communication, we present some new data
showing that HEXOKINASE1 (HXK1), the first identified glucose (Glc) sensor in
plants, was positively involved in Glc promotion of hypocotyl elongation in
Arabidopsis in the dark. It appears that the function of HXK1 is dependent on the
presence of BR, suggesting that BR may act downstream of HXK1 to positively
regulate Glc-induced hypocotyl elongation in Arabidopsis in darkness.
|Arabidopsis Proteins/metabolism
[MESH]
|Arabidopsis/drug effects/*growth & development
[MESH]
|Brassinosteroids/*pharmacology
[MESH]
|Carbohydrates/*pharmacology
[MESH]
|Darkness
[MESH]
|Ecotype
[MESH]
|Hexokinase/metabolism
[MESH]
|Hypocotyl/drug effects/growth & development
[MESH]