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| Status |
Public on Oct 05, 2021 |
| Title |
A molecular framework for control of oriented cell division in the Arabidopsis embryo |
| Organism |
Arabidopsis thaliana |
| Experiment type |
Expression profiling by array
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| Summary |
Premitotic control of cell division orientation is critical for plant development, as cell walls prevent extensive cell remodelling or migration. Whilst many divisions are proliferative and add cells to existing tissues, some divisions are formative, and generate new tissue layers or growth axes. Such formative divisions are often asymmetric in nature, producing daughters with different fates. We have previously shown that in the Arabidopsis thaliana embryo, developmental asymmetry is correlated with geometric asymmetry, creating daughter cells of unequal volume. Such divisions are generated by division planes that deviate from a default “minimal surface area” rule. Inhibition of auxin response leads to reversal to this default, yet the mechanisms underlying division plane choice in the embryo have been unclear. Here we show that auxin-dependent division plane control involves alterations in cell geometry, but not in cell polarity or nuclear position. Through transcriptome profiling, we find that auxin regulates genes controlling cell wall and cytoskeleton properties. We confirm the involvement of microtubule (MT)-binding proteins in embryo division control. Topology of both MT and Actin cytoskeleton depend on auxin response, and genetically controlled MT or Actin depolymerization in embryos leads to disruption of asymmetric divisions, including reversion to the default. Our work shows how auxin-dependent control of MT- and Actin cytoskeleton properties interacts with cell geometry to generate asymmetric divisions during the earliest steps in plant development.
Transcriptional profiling of Col-0 vs bdl 8-cell Arabidopsis embryos
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| Overall design |
Three replicates of Col-0 and bdl mutant 8-cell embryos were used for transcriptome profiling
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| Contributor(s) |
Weijers D |
| Citation(s) |
34610273 |
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| Submission date |
Feb 02, 2021 |
| Last update date |
Dec 10, 2021 |
| Contact name |
Dolf Weijers |
| E-mail(s) |
dolf.weijers@wur.nl
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| Organization name |
Wageningen University
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| Department |
Biochemistry
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| Street address |
Stippeneng 4
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| City |
Wageningen |
| ZIP/Postal code |
6708WE |
| Country |
Netherlands |
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| Platforms (1) |
| GPL22599 |
[AraGene-1_1-st] Arabidopsis Gene 1.1 ST Array [CDF: aragene11st_At_TAIRG version 19] |
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| Samples (7)
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| Relations |
| BioProject |
PRJNA698899 |
| Supplementary file |
Size |
Download |
File type/resource |
| GSE165986_RAW.tar |
59.5 Mb |
(http)(custom) |
TAR (of CEL) |
| Processed data included within Sample table |
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