1
|
Dai Y, Luo L, Zhao Z. Genetic robustness control of auxin output in priming organ initiation. Proc Natl Acad Sci U S A 2023; 120:e2221606120. [PMID: 37399382 PMCID: PMC10334806 DOI: 10.1073/pnas.2221606120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 05/17/2023] [Indexed: 07/05/2023] Open
Abstract
Auxin signaling is essential for organ initiation in plants. How genetic robustness controls auxin output during organ initiation is largely unknown. Here, we identified DORNROSCHEN-LIKE (DRNL) as a target of MONOPTEROS (MP) that plays essential roles in organ initiation. We demonstrate that MP physically interacts with DRNL to inhibit cytokinin accumulation by directly activating ARABIDOPSIS HISTIDINE PHOSPHOTRANSFER PROTEIN 6 and CYTOKININ OXIDASE 6. DRN, the paralogous gene of DRNL, acts redundantly with DRNL but is not coexpressed with DRNL in the organ founder cells in which DRNL is expressed. We demonstrate that DRNL directly inhibits DRN expression in the peripheral zone, whereas DRN transcripts are ectopically activated in drnl mutants and fully restore the functional deficiency of drnl in organ initiation. Our results provide a mechanistic framework for the robust control of auxin signaling in organ initiation through paralogous gene-triggered spatial gene compensation effects.
Collapse
Affiliation(s)
- Yuqiu Dai
- Chinese Academy of Sciences Center for Excellence in Molecular Plant Sciences, Ministry of Education Key Laboratory for Cellular Dynamics, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei230027, China
| | - Linjie Luo
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu241000, China
- Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu241000, China
| | - Zhong Zhao
- Chinese Academy of Sciences Center for Excellence in Molecular Plant Sciences, Ministry of Education Key Laboratory for Cellular Dynamics, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei230027, China
| |
Collapse
|
2
|
Glowa D, Comelli P, Chandler JW, Werr W. Clonal sector analysis and cell ablation confirm a function for DORNROESCHEN-LIKE in founder cells and the vasculature in Arabidopsis. PLANTA 2021; 253:27. [PMID: 33420666 PMCID: PMC7794208 DOI: 10.1007/s00425-020-03545-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 12/20/2020] [Indexed: 06/02/2023]
Abstract
Inducible lineage analysis and cell ablation via conditional toxin expression in cells expressing the DORNRÖSCHEN-LIKE transcription factor represent an effective and complementary adjunct to conventional methods of functional gene analysis. Classical methods of functional gene analysis via mutational and expression studies possess inherent limitations, and therefore, the function of a large proportion of transcription factors remains unknown. We have employed two complementary, indirect methods to obtain functional information for the AP2/ERF transcription factor DORNRÖSCHEN-LIKE (DRNL), which is dynamically expressed in flowers and marks lateral organ founder cells. An inducible, two-component Cre-Lox system was used to express beta-glucuronidase GUS in cells expressing DRNL, to perform a sector analysis that reveals lineages of cells that transiently expressed DRNL throughout plant development. In a complementary approach, an inducible system was used to ablate cells expressing DRNL using diphtheria toxin A chain, to visualise the phenotypic consequences. These complementary analyses demonstrate that DRNL functionally marks founder cells of leaves and floral organs. Clonal sectors also included the vasculature of the leaves and petals, implicating a previously unidentified role for DRNL in provasculature development, which was confirmed in cotyledons by closer analysis of drnl mutants. Our findings demonstrate that inducible gene-specific lineage analysis and cell ablation via conditional toxin expression represent an effective and informative adjunct to conventional methods of functional gene analysis.
Collapse
Affiliation(s)
- Dorothea Glowa
- Developmental Biology, Institute of Zoology, Cologne Biocenter, Cologne University, Zülpicher Straße 47b, 50674, Cologne, Germany
| | - Petra Comelli
- Developmental Biology, Institute of Zoology, Cologne Biocenter, Cologne University, Zülpicher Straße 47b, 50674, Cologne, Germany
| | - John W Chandler
- Developmental Biology, Institute of Zoology, Cologne Biocenter, Cologne University, Zülpicher Straße 47b, 50674, Cologne, Germany
| | - Wolfgang Werr
- Developmental Biology, Institute of Zoology, Cologne Biocenter, Cologne University, Zülpicher Straße 47b, 50674, Cologne, Germany.
| |
Collapse
|
3
|
Comelli P, Glowa D, Frerichs A, Engelhorn J, Chandler JW, Werr W. Functional dissection of the DORNRÖSCHEN-LIKE enhancer 2 during embryonic and phyllotactic patterning. PLANTA 2020; 251:90. [PMID: 32236749 DOI: 10.1007/s00425-020-03381-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 03/20/2020] [Indexed: 06/11/2023]
Abstract
The Arabidopsis DORNRÖSCHEN-LIKE enhancer 2 comprises a high-occupancy target region in the IM periphery that integrates signals for the spiral phyllotactic pattern and cruciferous arrangement of sepals. Transcription of the DORNRÖSCHEN-LIKE (DRNL) gene marks lateral organ founder cells (LOFCs) in the peripheral zone of the inflorescence meristem (IM) and enhancer 2 (En2) in the DRNL promoter upstream region essentially contributes to this phyllotactic transcription pattern. Further analysis focused on the phylogenetically highly conserved 100-bp En2core element, which was sufficient to promote the phyllotactic pattern, but was recalcitrant to further shortening. Here, we show that En2core functions independent of orientation and create a series of mutations to study consequences on the transcription pattern. Their analysis shows that, first, in addition to in the inflorescence apex, En2core acts in the embryo; second, cis-regulatory target sequences are distributed throughout the 100-bp element, although substantial differences exist in their function between embryo and IM. Third, putative core auxin response elements (AuxREs) spatially activate or restrict DRNL expression, and fourth, according to chromatin configuration data, En2core enhancer activity in LOFCs correlates with an open chromatin structure at the DRNL transcription start. In combination, mutational and chromatin analyses imply that En2core comprises a high-occupancy target (HOT) region for transcription factors, which implements phyllotactic information for the spiral LOFC pattern in the IM periphery and coordinates the cruciferous array of floral sepals. Our data disfavor a contribution of activating auxin response factors (ARFs) but do not exclude auxin as a morphogenetic signal.
Collapse
Affiliation(s)
- Petra Comelli
- Developmental Biology, Biocenter, University of Cologne, Zülpicher Str 47b, 50674, Cologne, Germany
| | - Dorothea Glowa
- Developmental Biology, Biocenter, University of Cologne, Zülpicher Str 47b, 50674, Cologne, Germany
| | - Anneke Frerichs
- Developmental Biology, Biocenter, University of Cologne, Zülpicher Str 47b, 50674, Cologne, Germany
| | - Julia Engelhorn
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829, Cologne, Germany
- Institute for Molecular Physiology, Heinrich-Heine-Universität, Universitätsstraße 1, 40225, Düsseldorf, Germany
| | - John W Chandler
- Developmental Biology, Biocenter, University of Cologne, Zülpicher Str 47b, 50674, Cologne, Germany
| | - Wolfgang Werr
- Developmental Biology, Biocenter, University of Cologne, Zülpicher Str 47b, 50674, Cologne, Germany.
| |
Collapse
|
4
|
Chandler JW, Werr W. A phylogenetically conserved APETALA2/ETHYLENE RESPONSE FACTOR, ERF12, regulates Arabidopsis floral development. PLANT MOLECULAR BIOLOGY 2020; 102:39-54. [PMID: 31807981 PMCID: PMC6976583 DOI: 10.1007/s11103-019-00936-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 10/30/2019] [Indexed: 05/05/2023]
Abstract
Arabidopsis ETHYLENE RESPONSE FACTOR12 (ERF12), the rice MULTIFLORET SPIKELET1 orthologue pleiotropically affects meristem identity, floral phyllotaxy and organ initiation and is conserved among angiosperms. Reproductive development necessitates the coordinated regulation of meristem identity and maturation and lateral organ initiation via positive and negative regulators and network integrators. We have identified ETHYLENE RESPONSE FACTOR12 (ERF12) as the Arabidopsis orthologue of MULTIFLORET SPIKELET1 (MFS1) in rice. Loss of ERF12 function pleiotropically affects reproductive development, including defective floral phyllotaxy and increased floral organ merosity, especially supernumerary sepals, at incomplete penetrance in the first-formed flowers. Wildtype floral organ number in early formed flowers is labile, demonstrating that floral meristem maturation involves the stabilisation of positional information for organogenesis, as well as appropriate identity. A subset of erf12 phenotypes partly defines a narrow developmental time window, suggesting that ERF12 functions heterochronically to fine-tune stochastic variation in wild type floral number and similar to MFS1, promotes meristem identity. ERF12 expression encircles incipient floral primordia in the inflorescence meristem periphery and is strong throughout the floral meristem and intersepal regions. ERF12 is a putative transcriptional repressor and genetically opposes the function of its relatives DORNRÖSCHEN, DORNRÖSCHEN-LIKE and PUCHI and converges with the APETALA2 pathway. Phylogenetic analysis suggests that ERF12 is conserved among all eudicots and appeared in angiosperm evolution concomitant with the generation of floral diversity.
Collapse
Affiliation(s)
- J. W. Chandler
- Developmental Biology, Institute of Zoology, Cologne Biocenter, University of Cologne, Zuelpicher Straße 47b, 50674 Cologne, Germany
| | - W. Werr
- Developmental Biology, Institute of Zoology, Cologne Biocenter, University of Cologne, Zuelpicher Straße 47b, 50674 Cologne, Germany
| |
Collapse
|
5
|
Frerichs A, Engelhorn J, Altmüller J, Gutierrez-Marcos J, Werr W. Specific chromatin changes mark lateral organ founder cells in the Arabidopsis inflorescence meristem. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:3867-3879. [PMID: 31037302 PMCID: PMC6685650 DOI: 10.1093/jxb/erz181] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 04/18/2019] [Indexed: 05/20/2023]
Abstract
Fluorescence-activated cell sorting (FACS) and assay for transposase-accessible chromatin with high-throughput sequencing (ATAC-seq) were combined to analyse the chromatin state of lateral organ founder cells (LOFCs) in the peripheral zone of the Arabidopsis apetala1-1 cauliflower-1 double mutant inflorescence meristem. On a genome-wide level, we observed a striking correlation between transposase hypersensitive sites (THSs) detected by ATAC-seq and DNase I hypersensitive sites (DHSs). The mostly expanded DHSs were often substructured into several individual THSs, which correlated with phylogenetically conserved DNA sequences or enhancer elements. Comparing chromatin accessibility with available RNA-seq data, THS change configuration was reflected by gene activation or repression and chromatin regions acquired or lost transposase accessibility in direct correlation with gene expression levels in LOFCs. This was most pronounced immediately upstream of the transcription start, where genome-wide THSs were abundant in a complementary pattern to established H3K4me3 activation or H3K27me3 repression marks. At this resolution, the combined application of FACS/ATAC-seq is widely applicable to detect chromatin changes during cell-type specification and facilitates the detection of regulatory elements in plant promoters.
Collapse
Affiliation(s)
- Anneke Frerichs
- Developmental Biology, Department of Biology, Biocenter, University of Cologne, Cologne, Germany
| | - Julia Engelhorn
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg, Cologne, Germany
- Institute for Molecular Physiology, Heinrich-Heine-Universität, Düsseldorf, Germany
| | - Janine Altmüller
- Cologne Center for Genomics (CCG), University of Cologne, Weyertal Cologne, Germany
| | | | - Wolfgang Werr
- Developmental Biology, Department of Biology, Biocenter, University of Cologne, Cologne, Germany
- Correspondence:
| |
Collapse
|
6
|
Kirschner S, Woodfield H, Prusko K, Koczor M, Gowik U, Hibberd JM, Westhoff P. Expression of SULTR2;2, encoding a low-affinity sulphur transporter, in the Arabidopsis bundle sheath and vein cells is mediated by a positive regulator. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:4897-4906. [PMID: 30032291 PMCID: PMC6137973 DOI: 10.1093/jxb/ery263] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 07/10/2018] [Indexed: 05/03/2023]
Abstract
The bundle sheath provides a conduit linking veins and mesophyll cells. In the C3 plant Arabidopsis thaliana, it also plays important roles in oxidative stress and sulphur metabolism. However, the mechanisms responsible for the patterns of gene expression that underpin these metabolic specializations are poorly understood. Here, we used the Arabidopsis SULTR2;2 gene as a model to better understand mechanisms that restrict expression to the bundle sheath. Deletion analysis indicated that the SULTR2;2 promoter contains a short region necessary for expression in the bundle sheath and veins. This sequence acts as a positive regulator and is tolerant to multiple consecutive deletions indicating considerable redundancy in the cis-elements involved. It is highly conserved in SULTR2;2 genes of the Brassicaceae and is functional in the distantly related C4 species Flaveria bidentis that belongs to the Asteraceae. We conclude that expression of SULTR2;2 in the bundle sheath and veins is underpinned by a highly redundant sequence that likely represents an ancient and conserved mechanism found in families as diverse as the Asteraceae and Brassicaceae.
Collapse
Affiliation(s)
- Sandra Kirschner
- Institute for Plant Molecular and Developmental Biology, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße, Düsseldorf, Germany
| | - Helen Woodfield
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, UK
| | - Katharina Prusko
- Institute for Plant Molecular and Developmental Biology, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße, Düsseldorf, Germany
| | - Maria Koczor
- Institute for Plant Molecular and Developmental Biology, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße, Düsseldorf, Germany
| | - Udo Gowik
- Institute for Plant Molecular and Developmental Biology, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße, Düsseldorf, Germany
| | - Julian M Hibberd
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, UK
| | - Peter Westhoff
- Institute for Plant Molecular and Developmental Biology, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße, Düsseldorf, Germany
| |
Collapse
|
7
|
Luo L, Zeng J, Wu H, Tian Z, Zhao Z. A Molecular Framework for Auxin-Controlled Homeostasis of Shoot Stem Cells in Arabidopsis. MOLECULAR PLANT 2018; 11:899-913. [PMID: 29730265 DOI: 10.1016/j.molp.2018.04.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 04/04/2018] [Accepted: 04/20/2018] [Indexed: 05/23/2023]
Abstract
The classic phytohormone auxin plays an essential role in priming meristematic cell differentiation in the shoot apical meristem to promote lateral organ initiation. Recently, several lines of evidence have suggested that auxin is not only transported to new primordia but also descends to the stem cells in the central zone. However, the function of auxin in stem cell regulation has remained elusive. Here, we show that auxin signaling in stem cells is mediated, at least in part, by AUXIN RESPONSE FACTOR 5/MONOPTEROS (ARF5/MP), which directly represses the transcription of DORNROSCHEN/ENHANCER OF SHOOT REGENERATION 1 (DRN/ESR1). DRN expressed in stem cells positively regulates CLAVATA3 (CLV3) expression and has important meristematic functions. Our results provide a mechanistic framework for auxin control of shoot stem cell homeostasis and demonstrate how auxin differentially controls plant stem cell maintenance and differentiation.
Collapse
Affiliation(s)
- Linjie Luo
- CAS Center for Excellence in Molecular Plant Sciences, School of Life Sciences, University of Science and Technology of China, Huangshan Road 443, Hefei 230027, China
| | - Jian Zeng
- CAS Center for Excellence in Molecular Plant Sciences, School of Life Sciences, University of Science and Technology of China, Huangshan Road 443, Hefei 230027, China
| | - Haijun Wu
- CAS Center for Excellence in Molecular Plant Sciences, School of Life Sciences, University of Science and Technology of China, Huangshan Road 443, Hefei 230027, China
| | - Zhaoxia Tian
- CAS Center for Excellence in Molecular Plant Sciences, School of Life Sciences, University of Science and Technology of China, Huangshan Road 443, Hefei 230027, China.
| | - Zhong Zhao
- CAS Center for Excellence in Molecular Plant Sciences, School of Life Sciences, University of Science and Technology of China, Huangshan Road 443, Hefei 230027, China.
| |
Collapse
|
8
|
Chandler JW. Class VIIIb APETALA2 Ethylene Response Factors in Plant Development. TRENDS IN PLANT SCIENCE 2018; 23:151-162. [PMID: 29074232 DOI: 10.1016/j.tplants.2017.09.016] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 09/22/2017] [Accepted: 09/25/2017] [Indexed: 05/21/2023]
Abstract
The APETALA2 (AP2) transcription factor superfamily in many plant species is extremely large. In addition to well-documented roles in stress responses, some AP2 members in arabidopsis, such as those of subgroup VIIIb, which includes DORNRÖSCHEN, DORNRÖSCHEN-LIKE, PUCHI, and LEAFY PETIOLE, are also important developmental regulators throughout the plant life cycle. Information is accumulating from orthologs of these proteins in important crop species that they influence key agronomic traits, such as the release of bud-burst in woody perennials and floral meristem identity and branching in cereals, and thereby represent potential for agronomic improvement. Given the increasing recognition of their developmental significance, this review highlights the function of these proteins and addresses their phylogenetic and evolutionary relationships.
Collapse
Affiliation(s)
- John W Chandler
- Institute for Developmental Biology, Cologne Biocenter, University of Cologne, Zuelpicher Strasse 47b, D-50674 Cologne, Germany.
| |
Collapse
|
9
|
Thirulogachandar V, Alqudah AM, Koppolu R, Rutten T, Graner A, Hensel G, Kumlehn J, Bräutigam A, Sreenivasulu N, Schnurbusch T, Kuhlmann M. Leaf primordium size specifies leaf width and vein number among row-type classes in barley. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2017; 91:601-612. [PMID: 28482117 DOI: 10.1111/tpj.13590] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 04/20/2017] [Accepted: 04/27/2017] [Indexed: 05/18/2023]
Abstract
Exploring genes with impact on yield-related phenotypes is the preceding step to accomplishing crop improvements while facing a growing world population. A genome-wide association scan on leaf blade area (LA) in a worldwide spring barley collection (Hordeum vulgare L.), including 125 two- and 93 six-rowed accessions, identified a gene encoding the homeobox transcription factor, Six-rowed spike 1 (VRS1). VRS1 was previously described as a key domestication gene affecting spike development. Its mutation converts two-rowed (wild-type VRS1, only central fertile spikelets) into six-rowed spikes (mutant vrs1, fully developed fertile central and lateral spikelets). Phenotypic analyses of mutant and wild-type leaves revealed that mutants had an increased leaf width with more longitudinal veins. The observed significant increase of LA and leaf nitrogen (%) during pre-anthesis development in vrs1 mutants also implies a link between wider leaf and grain number, which was validated from the association of vrs1 locus with wider leaf and grain number. Histological and gene expression analyses indicated that VRS1 might influence the size of leaf primordia by affecting cell proliferation of leaf primordial cells. This finding was supported by the transcriptome analysis of mutant and wild-type leaf primordia where in the mutant transcriptional activation of genes related to cell proliferation was detectable. Here we show that VRS1 has an independent role on barley leaf development which might influence the grain number.
Collapse
Affiliation(s)
- Venkatasubbu Thirulogachandar
- Independent Junior Research Group Abiotic Stress Genomics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
- HEISENBERG-Research Group Plant Architecture, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
- Interdisciplinary Centre for Crop Plant Research (IZN), Hoher Weg 8, 06120, Halle (Saale), Germany
| | - Ahmad M Alqudah
- HEISENBERG-Research Group Plant Architecture, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Ravi Koppolu
- HEISENBERG-Research Group Plant Architecture, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Twan Rutten
- Research Group Structural Cell Biology, Department Physiology and Cell Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Andreas Graner
- Research Group Genome Diversity, Department Genebank, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Goetz Hensel
- Research Group Plant Reproductive Biology, Department Physiology and Cell Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Jochen Kumlehn
- Research Group Plant Reproductive Biology, Department Physiology and Cell Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Andrea Bräutigam
- Research Group Network Analysis and Modeling, Department Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Nese Sreenivasulu
- Independent Junior Research Group Abiotic Stress Genomics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
- Interdisciplinary Centre for Crop Plant Research (IZN), Hoher Weg 8, 06120, Halle (Saale), Germany
| | - Thorsten Schnurbusch
- HEISENBERG-Research Group Plant Architecture, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Markus Kuhlmann
- Independent Junior Research Group Abiotic Stress Genomics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK Gatersleben), Corrensstr. 3 06466 Stadt Seeland, OT Gatersleben, Germany
- Interdisciplinary Centre for Crop Plant Research (IZN), Hoher Weg 8, 06120, Halle (Saale), Germany
| |
Collapse
|
10
|
Chandler JW, Werr W. DORNRÖSCHEN, DORNRÖSCHEN-LIKE, and PUCHI redundantly control floral meristem identity and organ initiation in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:3457-3472. [PMID: 28859377 DOI: 10.1093/jxb/erx208] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 05/26/2017] [Indexed: 05/02/2023]
Abstract
The biphasic floral transition in Arabidopsis thaliana involves many redundant intersecting regulatory networks. The related AP2 transcription factors DORNRÖSCHEN (DRN), DORNRÖSCHEN-LIKE (DRNL), and PUCHI individually execute well-characterized functions in diverse developmental contexts, including floral development. Here, we show that their combined loss of function leads to synergistic floral phenotypes, including reduced floral merosity in all whorls, which reflects redundant functions of all three genes in organ initiation rather than outgrowth. Additional loss of BLADE-ON-PETIOLE1 (BOP1) and BOP2 functions results in the complete conversion of floral meristems into secondary inflorescence shoots, demonstrating that all five genes define an essential regulatory network for establishing floral meristem identity, and we show that their functions converge to regulate LEAFY expression. Thus, despite their largely discrete spatiotemporal expression domains in the inflorescence meristem and early floral meristem, PUCHI, DRN, and DRNL interdependently contribute to cellular fate decisions. Auxin might represent one potential non-cell-autonomous mediator of their gene functions, because PUCHI, DRN, and DRNL all interact with auxin transport and biosynthesis pathways.
Collapse
Affiliation(s)
- J W Chandler
- Institute of Developmental Biology, Cologne Biocenter, University of Cologne, Germany
| | - W Werr
- Institute of Developmental Biology, Cologne Biocenter, University of Cologne, Germany
| |
Collapse
|