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Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Biol. Chem
Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: ACS Chem. Biol doi: 10.1021/cb900269u
Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: J Gen Plant Pathol
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Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: BMC Plant Biol.
Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Meth Enzymol
Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Biol. Chem
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Autor Nach Häufigkeit alphabetisch sortiert: Liao, C.-Y.
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Vaddepalli, P.; de Zeeuw, T.; Strauss, S.; Bürstenbinder, K.; Liao, C.-Y.; Ramalho, J. J.; Smith, R. S.; Weijers, D.; Auxin-dependent control of cytoskeleton and cell shape regulates division orientation in the Arabidopsis embryo Curr. Biol. 31, 4946-4955, (2021) DOI: 10.1016/j.cub.2021.09.019
Premitotic
control of cell division orientation is critical for plant development,
as cell walls prevent extensive cell remodeling or migration. While
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 axis 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. Organization of both MT and actin cytoskeleton depends 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.Graphical abstract