A bHLH Complex Controls Embryonic Vascular Tissue Establishment and Indeterminate Growth in Arabidopsis

De Rybel, Bert; Möller, Barbara; Yoshida, Saiko; Grabowicz, Ilona; Barbier de Reuille, Pierre; Boeren, Sjef; Smith, Richard Simon; Borst, Jan Willem; Weijers, Dolf (2013). A bHLH Complex Controls Embryonic Vascular Tissue Establishment and Indeterminate Growth in Arabidopsis. Developmental cell, 24(4), pp. 426-437. Cambridge, Mass.: Cell Press 10.1016/j.devcel.2012.12.013

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Plants have a remarkable potential for sustained (indeterminate) postembryonic growth. Following their specification in the early embryo, tissue-specific precursor cells first establish tissues and later maintain them postembryonically. The mechanisms underlying these processes are largely unknown. Here we define local control of oriented, periclinal cell division as the mechanism underlying both the establishment and maintenance of vascular tissue. We identify an auxin-regulated basic helix-loop-helix (bHLH) transcription factor dimer as a critical regulator of vascular development. Due to a loss of periclinal divisions, vascular tissue gradually disappears in bHLH-deficient mutants; conversely, ectopic expression is sufficient for triggering periclinal divisions. We show that this dimer operates independently of tissue identity but is restricted to a small vascular domain by integrating overlapping transcription patterns of the interacting bHLH proteins. Our work reveals a common mechanism for tissue establishment and indeterminate vascular development and provides a conceptual framework for developmental control of local cell divisions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Development
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Yoshida, Saiko; Barbier de Reuille, Pierre and Smith, Richard Simon

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1534-5807

Publisher:

Cell Press

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

12 Feb 2014 08:06

Last Modified:

08 Sep 2015 12:09

Publisher DOI:

10.1016/j.devcel.2012.12.013

BORIS DOI:

10.7892/boris.38668

URI:

https://boris.unibe.ch/id/eprint/38668

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