A Gene Regulatory Network for Cellular Reprogramming in Plant Regeneration

Abstract Wounding triggers organ regeneration in many plant species, and application of plant hormones, such as auxin and cytokinin, enhances their regenerative capacities in tissue culture. Recent studies have identified several key players mediating wound- and/or plant hormone-induced cellular rep...

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Published in:Plant and cell physiology Vol. 59; no. 4; pp. 765 - 777
Main Authors: Ikeuchi, Momoko, Shibata, Michitaro, Rymen, Bart, Iwase, Akira, B�gman, Anne-Maarit, Watt, Lewis, Coleman, Duncan, Favero, David S, Takahashi, Tatsuya, Ahnert, Sebastian E, Brady, Siobhan M, Sugimoto, Keiko
Format: Journal Article
Language:English
Published: Japan Oxford University Press 01.04.2018
Subjects:
Arabidopsis Proteins - metabolism
Cellular Reprogramming - drug effects
Cellular Reprogramming - genetics
Cytokinins - pharmacology
Gene Regulatory Networks - drug effects
Genes, Plant
Indoleacetic Acids - pharmacology
Plant Cells - metabolism
Plants - genetics
Promoter Regions, Genetic
Regeneration - drug effects
Regeneration - genetics
Transcription Factors - metabolism
Callus formation
Cellular reprogramming
Regeneration
Wound stress
Auxin
Cytokinin
ISSN:0032-0781, 1471-9053, 1471-9053
Online Access:Get full text
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Summary:Abstract Wounding triggers organ regeneration in many plant species, and application of plant hormones, such as auxin and cytokinin, enhances their regenerative capacities in tissue culture. Recent studies have identified several key players mediating wound- and/or plant hormone-induced cellular reprogramming, but the global architecture of gene regulatory relationships underlying plant cellular reprogramming is still far from clear. In this study, we uncovered a gene regulatory network (GRN) associated with plant cellular reprogramming by using an enhanced yeast one-hybrid (eY1H) screen systematically to identify regulatory relationships between 252 transcription factors (TFs) and 48 promoters. Our network analyses suggest that wound- and/or hormone-invoked signals exhibit extensive cross-talk and regulate many common reprogramming-associated genes via multilayered regulatory cascades. Our data suggest that PLETHORA 3 (PLT3), ENHANCER OF SHOOT REGENERATION 1 (ESR1) and HEAT SHOCK FACTOR B 1 (HSFB1) act as critical nodes that have many overlapping targets and potentially connect upstream stimuli to downstream developmental decisions. Interestingly, a set of wound-inducible APETALA 2/ETHYLENE RESPONSE FACTORs (AP2/ERFs) appear to regulate these key genes, which, in turn, form feed-forward cascades that control downstream targets associated with callus formation and organ regeneration. In addition, we found another regulatory pathway, mediated by LATERAL ORGAN BOUNDARY/ASYMMETRIC LEAVES 2 (LOB/AS2) TFs, which probably plays a distinct but partially overlapping role alongside the AP2/ERFs in the putative gene regulatory cascades. Taken together, our findings provide the first global picture of the GRN governing plant cell reprogramming, which will serve as a valuable resource for future studies.
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ISSN:0032-0781
1471-9053
1471-9053
DOI:10.1093/pcp/pcy013