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פותח על ידי קלירמאש פתרונות בע"מ -
Guard cells control hypocotyl elongation through HXK1, HY5, and PIF4
Year:
2021
Source of publication :
communications biology
Authors :
בלאוסוב, אדוארד
;
.
גרנות, דוד
;
.
דורון-פייגנבאום, עדי
;
.
כרמי, ניר
;
.
לוגסי, ניצן
;
.
צמח, חניתה
;
.
קלי, גילאור
;
.
שטיין, עופר
;
.
שייע, פליקס
;
.
Volume :
Co-Authors:

Gilor Kelly
Danja Brandsma
Aiman Egbaria
Ofer Stein
Adi Doron-Faigenboim
Nitsan Lugassi
Eduard Belausov
Hanita Zemach
Felix Shaya
Nir Carmi 
Nir Sade
David Granot

          

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

The hypocotyls of germinating seedlings elongate in a search for light to enable autotrophic sugar production. Upon exposure to light, photoreceptors that are activated by blue and red light halt elongation by preventing the degradation of the hypocotyl-elongation inhibitor HY5 and by inhibiting the activity of the elongation-promoting transcription factors PIFs. The question of how sugar affects hypocotyl elongation and which cell types stimulate and stop that elongation remains unresolved. We found that overexpression of a sugar sensor, Arabidopsis hexokinase 1 (HXK1), in guard cells promotes hypocotyl elongation under white and blue light through PIF4. Furthermore, expression of PIF4 in guard cells is sufficient to promote hypocotyl elongation in the light, while expression of HY5 in guard cells is sufficient to inhibit the elongation of the hy5 mutant and the elongation stimulated by HXK1. HY5 exits the guard cells and inhibits hypocotyl elongation, but is degraded in the dark. We also show that the inhibition of hypocotyl elongation by guard cells' HY5 involves auto-activation of HY5 expression in other tissues. It appears that guard cells are capable of coordinating hypocotyl elongation and that sugar and HXK1 have the opposite effect of light on hypocotyl elongation, converging at PIF4.

Note:
Related Files :
guard cells
Hypocotyl Elongation
Light responses
Plant Molecular Biology
plant physiology
stomata
עוד תגיות
תוכן קשור
More details
DOI :
10.1038/s42003-021-02283-y
Article number:
0
Affiliations:
Database:
PubMed
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
55471
Last updated date:
02/03/2022 17:27
Creation date:
05/07/2021 18:13
You may also be interested in
Scientific Publication
Guard cells control hypocotyl elongation through HXK1, HY5, and PIF4

Gilor Kelly
Danja Brandsma
Aiman Egbaria
Ofer Stein
Adi Doron-Faigenboim
Nitsan Lugassi
Eduard Belausov
Hanita Zemach
Felix Shaya
Nir Carmi 
Nir Sade
David Granot

          

Guard cells control hypocotyl elongation through HXK1, HY5, and PIF4

The hypocotyls of germinating seedlings elongate in a search for light to enable autotrophic sugar production. Upon exposure to light, photoreceptors that are activated by blue and red light halt elongation by preventing the degradation of the hypocotyl-elongation inhibitor HY5 and by inhibiting the activity of the elongation-promoting transcription factors PIFs. The question of how sugar affects hypocotyl elongation and which cell types stimulate and stop that elongation remains unresolved. We found that overexpression of a sugar sensor, Arabidopsis hexokinase 1 (HXK1), in guard cells promotes hypocotyl elongation under white and blue light through PIF4. Furthermore, expression of PIF4 in guard cells is sufficient to promote hypocotyl elongation in the light, while expression of HY5 in guard cells is sufficient to inhibit the elongation of the hy5 mutant and the elongation stimulated by HXK1. HY5 exits the guard cells and inhibits hypocotyl elongation, but is degraded in the dark. We also show that the inhibition of hypocotyl elongation by guard cells' HY5 involves auto-activation of HY5 expression in other tissues. It appears that guard cells are capable of coordinating hypocotyl elongation and that sugar and HXK1 have the opposite effect of light on hypocotyl elongation, converging at PIF4.

Scientific Publication
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