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The Arabidopsis bZIP11 transcription factor links low-energy signalling to auxin-mediated control of primary root growth
Please always quote using this URN: urn:nbn:de:bvb:20-opus-157742
- Plants have to tightly control their energy homeostasis to ensure survival and fitness under constantly changing environmental conditions. Thus, it is stringently required that energy-consuming stress-adaptation and growth-related processes are dynamically tuned according to the prevailing energy availability. The evolutionary conserved SUCROSE NON-FERMENTING1 RELATED KINASES1 (SnRK1) and the downstream group C/S\(_{1}\) basic leucine zipper (bZIP) transcription factors (TFs) are well-characterised central players in plants’ low-energyPlants have to tightly control their energy homeostasis to ensure survival and fitness under constantly changing environmental conditions. Thus, it is stringently required that energy-consuming stress-adaptation and growth-related processes are dynamically tuned according to the prevailing energy availability. The evolutionary conserved SUCROSE NON-FERMENTING1 RELATED KINASES1 (SnRK1) and the downstream group C/S\(_{1}\) basic leucine zipper (bZIP) transcription factors (TFs) are well-characterised central players in plants’ low-energy management. Nevertheless, mechanistic insights into plant growth control under energy deprived conditions remains largely elusive. In this work, we disclose the novel function of the low-energy activated group S\(_{1}\) bZIP11-related TFs as regulators of auxin-mediated primary root growth. Whereas transgenic gain-of-function approaches of these bZIPs interfere with the activity of the root apical meristem and result in root growth repression, root growth of loss-of-function plants show a pronounced insensitivity to low-energy conditions. Based on ensuing molecular and biochemical analyses, we propose a mechanistic model, in which bZIP11-related TFs gain control over the root meristem by directly activating IAA3/SHY2 transcription. IAA3/SHY2 is a pivotal negative regulator of root growth, which has been demonstrated to efficiently repress transcription of major auxin transport facilitators of the PIN-FORMED (PIN) gene family, thereby restricting polar auxin transport to the root tip and in consequence auxin-driven primary root growth. Taken together, our results disclose the central low-energy activated SnRK1-C/S\(_{1}\)-bZIP signalling module as gateway to integrate information on the plant’s energy status into root meristem control, thereby balancing plant growth and cellular energy resources.…
Author: | Christoph Weiste, Lorenzo Pedrotti, Jebasingh Selvanayagam, Prathibha Muralidhara, Christian Fröschel, Ondřej Novák, Karin Ljung, Johannes Hanson, Wolfgang Dröge-Laser |
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URN: | urn:nbn:de:bvb:20-opus-157742 |
Document Type: | Journal article |
Faculties: | Fakultät für Biologie / Julius-von-Sachs-Institut für Biowissenschaften |
Language: | English |
Parent Title (English): | PLoS Genetics |
Year of Completion: | 2017 |
Volume: | 13 |
Issue: | 2 |
Pagenumber: | e1006607 |
Source: | PLoS Genetics 13(2): e1006607 (2017). DOI: 10.1371/journal.pgen.1006607 |
DOI: | https://doi.org/10.1371/journal.pgen.1006607 |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
Tag: | auxins; gene expression; genetically modified plants; meristems; plant growth and development; regulator genes; root growth; sucrose |
Release Date: | 2018/02/21 |
Collections: | Open-Access-Publikationsfonds / Förderzeitraum 2017 |
Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |