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| Status |
Public on Feb 08, 2017 |
| Title |
Expression data from epidermis specific phytochrome B or global phytochrome B line comparing to phyB-9 mutant. |
| Organism |
Arabidopsis thaliana |
| Experiment type |
Expression profiling by array
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| Summary |
Seedling hypocotyls display negative gravitropism in the dark but agravitropism in the light. The Arabidopsis thaliana pif quadruple mutant (pifQ), which lacks four PHYTOCHROME-INTERACTING FACTORS (PIFs), is agravitropic in the dark. Endodermis-specific expression of PIF1 rescues gravitropism in pifQ mutant seedlings. Since phytochromes induce light responses by inhibiting PIFs and the COP1-SPA ubiquitin E3 ligase complex in the nucleus, we asked whether phyB can cell autonomously inhibit hypocotyl negative gravitropism in the endodermis. We found that while epidermis-specific expression of PHYB rescues hypocotyl negative gravitropism and all other phyB mutant phenotypes, endodermis-specific expression of PHYB does not. Epidermal phyB induces the phosphorylation and degradation of endodermal PIFs in response to red light. This induces a global gene expression pattern similar to that induced by red light treatment of seedlings expressing PHYB under the control of its own endogenous promoter. Our results imply that epidermal phyB generates an unidentified mobile signal that travels to the endodermis where it promotes PIF degradation and inhibits hypocotyl negative gravitropism.
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| Overall design |
ML1pro:PHYBGFP/phyB-9 and PHYBpro:PHYBGFP/phyB-9 and phyB-9 seeds were grown in continuous red condition (11.4 μmol·m−2·s−1) and then, sampled for RNA extraction. Total 4 biological replicates were used for the microarray
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| Contributor(s) |
Choi G |
| Citation(s) |
27758895 |
| |
| Submission date |
Oct 04, 2016 |
| Last update date |
Feb 08, 2017 |
| Contact name |
Giltsu Choi |
| E-mail(s) |
[email protected]
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| Phone |
82423502636
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| Organization name |
KAIST
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| Department |
Biological Sciences
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| Lab |
Phytochrome Lab
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| Street address |
335 Gwahangno
|
| City |
Daejeon |
| ZIP/Postal code |
305-701 |
| Country |
South Korea |
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| Platforms (1) |
| GPL12621 |
Agilent-021169 Arabidopsis 4 Oligo Microarray (V4) (Probe Name version) |
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| Samples (8)
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| Relations |
| BioProject |
PRJNA345317 |
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