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A robust auxin response network controls embryo and suspensor development through a bHLH transcriptional module

(2019) PLANT CELL. 31(1). p.52-67
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Abstract
Land plants reproduce sexually by developing an embryo from a fertilized egg cell. However, embryos can also be formed from other cell types in many plant species. Thus, a key question is how embryo identity in plants is controlled, and how this process is modified during nonzygotic embryogenesis. The Arabidopsis (Arabidopsis thaliana) zygote divides to produce an embryonic lineage and an extra-embryonic suspensor. Yet, normally quiescent suspensor cells can develop a second embryo when the initial embryo is damaged, or when response to the signaling molecule auxin is locally blocked. Here we used auxindependent suspensor embryogenesis as a model to determine transcriptome changes during embryonic reprogramming. We found that reprogramming is complex and accompanied by large transcriptomic changes before anatomical changes. This analysis revealed a strong enrichment for genes encoding components of auxin homeostasis and response among misregulated genes. Strikingly, deregulation among multiple auxin-related gene families converged upon the reestablishment of cellular auxin levels or response. This finding points to a remarkable degree of feedback regulation to create resilience in the auxin response during embryo development. Starting from the transcriptome of auxin-deregulated embryos, we identified an auxin-dependent basic Helix Loop Helix transcription factor network that mediates the activity of this hormone in suppressing embryo development from the suspensor.
Keywords
GENOME-WIDE ANALYSIS, GENE-EXPRESSION, CELL FATE, ARABIDOPSIS, ROOT, EMBRYOGENESIS, DIFFERENTIATION, INITIATION, PROTEINS, TRANSFORMATION

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Chicago
Radoeva, Tatyana, Annemarie S Lokerse, Cristina I Llavata-Peris, Jos Wendrich, Daoquan Xiang, Che-Yang Liao, Lieke Vlaar, et al. 2019. “A Robust Auxin Response Network Controls Embryo and Suspensor Development Through a bHLH Transcriptional Module.” Plant Cell 31 (1): 52–67.
APA
Radoeva, T., Lokerse, A. S., Llavata-Peris, C. I., Wendrich, J., Xiang, D., Liao, C.-Y., Vlaar, L., et al. (2019). A robust auxin response network controls embryo and suspensor development through a bHLH transcriptional module. PLANT CELL, 31(1), 52–67.
Vancouver
1.
Radoeva T, Lokerse AS, Llavata-Peris CI, Wendrich J, Xiang D, Liao C-Y, et al. A robust auxin response network controls embryo and suspensor development through a bHLH transcriptional module. PLANT CELL. 2019;31(1):52–67.
MLA
Radoeva, Tatyana et al. “A Robust Auxin Response Network Controls Embryo and Suspensor Development Through a bHLH Transcriptional Module.” PLANT CELL 31.1 (2019): 52–67. Print.
@article{8590098,
  abstract     = {Land plants reproduce sexually by developing an embryo from a fertilized egg cell. However, embryos can also be formed from other cell types in many plant species. Thus, a key question is how embryo identity in plants is controlled, and how this process is modified during nonzygotic embryogenesis. The Arabidopsis (Arabidopsis thaliana) zygote divides to produce an embryonic lineage and an extra-embryonic suspensor. Yet, normally quiescent suspensor cells can develop a second embryo when the initial embryo is damaged, or when response to the signaling molecule auxin is locally blocked. Here we used auxindependent suspensor embryogenesis as a model to determine transcriptome changes during embryonic reprogramming. We found that reprogramming is complex and accompanied by large transcriptomic changes before anatomical changes. This analysis revealed a strong enrichment for genes encoding components of auxin homeostasis and response among misregulated genes. Strikingly, deregulation among multiple auxin-related gene families converged upon the reestablishment of cellular auxin levels or response. This finding points to a remarkable degree of feedback regulation to create resilience in the auxin response during embryo development. Starting from the transcriptome of auxin-deregulated embryos, we identified an auxin-dependent basic Helix Loop Helix transcription factor network that mediates the activity of this hormone in suppressing embryo development from the suspensor.},
  articleno    = {tpc.00518.2018},
  author       = {Radoeva, Tatyana and Lokerse, Annemarie S and Llavata-Peris, Cristina I and Wendrich, Jos and Xiang, Daoquan and Liao, Che-Yang and Vlaar, Lieke and Boekschoten, Mark and Hooiveld, Guido and Datla, Raju and Weijers, Dolf},
  issn         = {1040-4651},
  journal      = {PLANT CELL},
  language     = {eng},
  number       = {1},
  pages        = {tpc.00518.2018:52--tpc.00518.2018:67},
  title        = {A robust auxin response network controls embryo and suspensor development through a bHLH transcriptional module},
  url          = {http://dx.doi.org/10.1105/tpc.18.00518},
  volume       = {31},
  year         = {2019},
}

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