NDLI: A SCARECROW-based regulatory circuit controls Arabidopsis thaliana meristem size from the root endodermis

Content Provider	Springer Nature Link
Author	Moubayidin, Laila Salvi, Elena Giustini, Leonardo Terpstra, Inez Heidstra, Renze Costanti, Paolo Sabatini, Sabrina
Copyright Year	2016
Abstract	SCARECROW controls Arabidopsis root meristem size from the root endodermis tissue by regulating the DELLA protein RGA that in turn mediates the regulation of ARR1 levels at the transition zone. Coherent organ growth requires a fine balance between cell division and cell differentiation. Intriguingly, plants continuously develop organs post-embryonically thanks to the activity of meristems that allow growth and environmental plasticity. In Arabidopsis thaliana, continued root growth is assured when division of the distal stem cell and their daughters is balanced with cell differentiation at the meristematic transition zone (TZ). We have previously shown that at the TZ, the cytokinin-dependent transcription factor ARR1 controls the rate of differentiation commitment of meristematic cells and that its activities are coordinated with those of the distal stem cells by the gene SCARECROW (SCR). In the stem cell organizer (the quiescent center, QC), SCR directly suppresses ARR1 both sustaining stem cell activities and titrating non-autonomously the ARR1 transcript levels at the TZ via auxin. Here, we show that SCR also exerts a fine control on ARR1 levels at the TZ from the endodermis by sustaining gibberellin signals. From the endodermis, SCR controls the RGA REPRESSOR OF ga1-3 (RGA) DELLA protein stability throughout the root meristem, thus controlling ARR1 transcriptional activation at the TZ. This guarantees robustness and fineness to the control of ARR1 levels necessary to balance cell division to cell differentiation in sustaining coherent root growth. Therefore, this work advances the state of the art in the field of root meristem development by integrating the activity of three hormones, auxin, gibberellin, and cytokinin, under the control of different tissue-specific activities of a single root key regulator, SCR.
Starting Page	1159
Ending Page	1168
Page Count	10
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	243
Issue Number	5
e-ISSN	14322048
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-05
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ARABIDOPSIS RESPONSE REGULATOR 1 (ARR1) Differentiation Gibberellin Hormones Root SCARECROW (SCR) Plant Sciences Agriculture Ecology Forestry
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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