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1,174 results on '"Ljung, Karin"'

5. KIPK and KIPK-LIKE1 suppress overbending during negative hypocotyl gravitropic growth

Author

Xiao, Yao, primary, Zourelidou, Melina, additional, Bassukas, Alkistis E. Lanassa, additional, Weller, Benjamin, additional, Janacek, Dorina P., additional, Schnulz, Lukas, additional, Brajkovic, Sarah, additional, Simura, Jan, additional, Kuster, Bernhard, additional, Schwechheimer, Claus, additional, Ljung, Karin, additional, Li, Jia, additional, and Hammes, Ulrich Z., additional

Published
2024
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6. Selective auxin agonists induce specific AUX/IAA protein degradation to modulate plant development

Author

Vain, Thomas, Raggi, Sara, Ferro, Noel, Barange, Deepak Kumar, Kieffer, Martin, Ma, Qian, Doyle, Siamsa M, Thelander, Mattias, Pařízková, Barbora, Novák, Ondřej, Ismail, Alexandre, Enquist, Per-Anders, Rigal, Adeline, Łangowska, Małgorzata, Harborough, Sigurd Ramans, Zhang, Yi, Ljung, Karin, Callis, Judy, Almqvist, Fredrik, Kepinski, Stefan, Estelle, Mark, Pauwels, Laurens, and Robert, Stéphanie

Subjects
Emerging Infectious Diseases, Arabidopsis, Arabidopsis Proteins, F-Box Proteins, Gene Expression Regulation, Plant, Indoleacetic Acids, NEDD8 Protein, Plant Development, Plant Growth Regulators, Plants, Genetically Modified, Proteolysis, Receptors, Cell Surface, SKP Cullin F-Box Protein Ligases, Seedlings, Signal Transduction, Transcription Factors, Transcription, Genetic, auxin, chemical biology, selective agonist, prohormone, hormone perception
Abstract

Auxin phytohormones control most aspects of plant development through a complex and interconnected signaling network. In the presence of auxin, AUXIN/INDOLE-3-ACETIC ACID (AUX/IAA) transcriptional repressors are targeted for degradation by the SKP1-CULLIN1-F-BOX (SCF) ubiquitin-protein ligases containing TRANSPORT INHIBITOR RESISTANT 1/AUXIN SIGNALING F-BOX (TIR1/AFB). CULLIN1-neddylation is required for SCFTIR1/AFB functionality, as exemplified by mutants deficient in the NEDD8-activating enzyme subunit AUXIN-RESISTANT 1 (AXR1). Here, we report a chemical biology screen that identifies small molecules requiring AXR1 to modulate plant development. We selected four molecules of interest, RubNeddin 1 to 4 (RN1 to -4), among which RN3 and RN4 trigger selective auxin responses at transcriptional, biochemical, and morphological levels. This selective activity is explained by their ability to consistently promote the interaction between TIR1 and a specific subset of AUX/IAA proteins, stimulating the degradation of particular AUX/IAA combinations. Finally, we performed a genetic screen using RN4, the RN with the greatest potential for dissecting auxin perception, which revealed that the chromatin remodeling ATPase BRAHMA is implicated in auxin-mediated apical hook development. These results demonstrate the power of selective auxin agonists to dissect auxin perception for plant developmental functions, as well as offering opportunities to discover new molecular players involved in auxin responses.

Published
2019

7. Surveillance of cell wall diffusion barrier integrity modulates water and solute transport in plants.

Author

Wang, Peng, Calvo-Polanco, Monica, Reyt, Guilhem, Barberon, Marie, Champeyroux, Chloe, Santoni, Véronique, Maurel, Christophe, Franke, Rochus B, Ljung, Karin, Novak, Ondrej, Geldner, Niko, Boursiac, Yann, and Salt, David E

Abstract

The endodermis is a key cell layer in plant roots that contributes to the controlled uptake of water and mineral nutrients into plants. In order to provide such functionality the endodermal cell wall has specific chemical modifications consisting of lignin bands (Casparian strips) that encircle each cell, and deposition of a waxy-like substance (suberin) between the wall and the plasma membrane. These two extracellular deposits provide control of diffusion enabling the endodermis to direct the movement of water and solutes into and out of the vascular system in roots. Loss of integrity of the Casparian strip-based apoplastic barrier is sensed by the leakage of a small peptide from the stele into the cortex. Here, we report that such sensing of barrier integrity leads to the rebalancing of water and mineral nutrient uptake, compensating for breakage of Casparian strips. This rebalancing involves both a reduction in root hydraulic conductivity driven by deactivation of aquaporins, and downstream limitation of ion leakage through deposition of suberin. These responses in the root are also coupled to a reduction in water demand in the shoot mediated by ABA-dependent stomatal closure.

Published
2019

11. Broad spectrum developmental role of Brachypodium AUX1

Author

van der Schuren, Alja, Voiniciuc, Catalin, Bragg, Jennifer, Ljung, Karin, Vogel, John, Pauly, Markus, and Hardtke, Christian S

Subjects
Plant Biology, Biological Sciences, Biotechnology, Genetics, Brachypodium, Gene Expression Regulation, Plant, Gravitropism, Mutation, Phenotype, Plant Development, Plant Proteins, Plant Roots, Plant Shoots, AUX1, auxin, monocotyledon, seminal root, Agricultural and Veterinary Sciences, Plant Biology & Botany, Plant biology, Climate change impacts and adaptation, Ecological applications
Abstract

Targeted cellular auxin distribution is required for morphogenesis and adaptive responses of plant organs. In Arabidopsis thaliana (Arabidopsis), this involves the prototypical auxin influx facilitator AUX1 and its LIKE-AUX1 (LAX) homologs, which act partially redundantly in various developmental processes. Interestingly, AUX1 and its homologs are not strictly essential for the Arabidopsis life cycle. Indeed, aux1 lax1 lax2 lax3 quadruple knock-outs are mostly viable and fertile, and strong phenotypes are only observed at low penetrance. Here we investigated the Brachypodium distachyon (Brachypodium) AUX1 homolog BdAUX1 by genetic, cell biological and physiological analyses. We report that BdAUX1 is essential for Brachypodium development. Bdaux1 loss-of-function mutants are dwarfs with aberrant flower development, and consequently infertile. Moreover, they display a counter-intuitive root phenotype. Although Bdaux1 roots are agravitropic as expected, in contrast to Arabidopsis aux1 mutants they are dramatically longer than wild type roots because of exaggerated cell elongation. Interestingly, this correlates with higher free auxin content in Bdaux1 roots. Consistently, their cell wall characteristics and transcriptome signature largely phenocopy other Brachypodium mutants with increased root auxin content. Our results imply fundamentally different wiring of auxin transport in Brachypodium roots and reveal an essential role of BdAUX1 in a broad spectrum of developmental processes, suggesting a central role for AUX1 in pooideae.

Published
2018

16. HISTONE DEACETYLASE 9 stimulates auxin-dependent thermomorphogenesis in Arabidopsis thaliana by mediating H2A.Z depletion

Author

van der Woude, Lennard C., Perrella, Giorgio, Snoek, Basten L., van Hoogdalem, Mark, Novák, Ondřej, van Verk, Marcel C., van Kooten, Heleen N., Zorn, Lennert E., Tonckens, Rolf, Dongus, Joram A., Praat, Myrthe, Stouten, Evelien A., Proveniers, Marcel C. G., Vellutini, Elisa, Patitaki, Eirini, Shapulatov, Umidjon, Kohlen, Wouter, Balasubramanian, Sureshkumar, Ljung, Karin, van der Krol, Alexander R., Smeekens, Sjef, Kaiserli, Eirini, and van Zanten, Martijn

Published
2019

19. In situ seasonal patterns of root auxin concentrations and meristem length in an arctic sedge

Author

Blume-Werry, Gesche, Semenchuk, Philipp, Ljung, Karin, Milbau, Ann, Novak, Ondrej, Olofsson, Johan, Brunoni, Federica, Blume-Werry, Gesche, Semenchuk, Philipp, Ljung, Karin, Milbau, Ann, Novak, Ondrej, Olofsson, Johan, and Brunoni, Federica

Abstract

Seasonal dynamics of root growth play an important role in large-scale ecosystem processes; they are largely governed by growth regulatory compounds and influenced by environmental conditions. Yet, our knowledge about physiological drivers of root growth is mostly limited to laboratory-based studies on model plant species. We sampled root tips of Eriophorum vaginatum and analyzed their auxin concentrations and meristem lengths biweekly over a growing season in situ in a subarctic peatland, both in surface soil and at the permafrost thawfront. Auxin concentrations were almost five times higher in surface than in thawfront soils and increased over the season, especially at the thawfront. Surprisingly, meristem length showed an opposite pattern and was almost double in thawfront compared with surface soils. Meristem length increased from peak to late season in the surface soils but decreased at the thawfront. Our study of in situ seasonal dynamics in root physiological parameters illustrates the potential for physiological methods to be applied in ecological studies and emphasizes the importance of in situ measurements. The strong effect of root location and the unexpected opposite patterns of meristem length and auxin concentrations likely show that auxin actively governs root growth to ensure a high potential for nutrient uptake at the thawfront.

Published
2024
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22. The epidermis coordinates auxin-induced stem growth in response to shade

Author

Procko, Carl, Burko, Yogev, Jaillais, Yvon, Ljung, Karin, Long, Jeff A, and Chory, Joanne

Subjects
Plant Biology, Biological Sciences, Biotechnology, Stem Cell Research, Stem Cell Research - Nonembryonic - Non-Human, Arabidopsis, Arabidopsis Proteins, Brassica rapa, Brassinosteroids, Gene Expression Profiling, Gene Expression Regulation, Plant, Hypocotyl, Indoleacetic Acids, Mutation, Nuclear Proteins, Plant Epidermis, Signal Transduction, Sunlight, Transcription Factors, auxin, brassinosteroid, epidermis, shade avoidance, stem growth, Medical and Health Sciences, Psychology and Cognitive Sciences, Developmental Biology, Biological sciences, Biomedical and clinical sciences, Psychology
Abstract

Growth of a complex multicellular organism requires coordinated changes in diverse cell types. These cellular changes generate organs of the correct size, shape, and functionality. In plants, the growth hormone auxin induces stem elongation in response to shade; however, which cell types of the stem perceive the auxin signal and contribute to organ growth is poorly understood. Here, we blocked the transcriptional response to auxin within specific tissues to show that auxin signaling is required in many cell types for correct hypocotyl growth in shade, with a key role for the epidermis. Combining genetic manipulations in Arabidopsis thaliana with transcriptional profiling of the hypocotyl epidermis from Brassica rapa, we show that auxin acts in the epidermis in part by inducing activity of the locally acting, growth-promoting brassinosteroid pathway. Our findings clarify cell-specific auxin function in the hypocotyl and highlight the complexity of cell type interactions within a growing organ.

Published
2016

23. Tree architecture: A strigolactone-deficient mutant reveals a connection between branching order and auxin gradient along the tree stem

Author

Su, Chang, primary, Kokosza, Andrzej, additional, Xie, Xiaonan, additional, Pěnčík, Aleš, additional, Zhang, Youjun, additional, Raumonen, Pasi, additional, Shi, Xueping, additional, Muranen, Sampo, additional, Topcu, Melis Kucukoglu, additional, Immanen, Juha, additional, Hagqvist, Risto, additional, Safronov, Omid, additional, Alonso-Serra, Juan, additional, Eswaran, Gugan, additional, Venegas, Mirko Pavicic, additional, Ljung, Karin, additional, Ward, Sally, additional, Mähönen, Ari Pekka, additional, Himanen, Kristiina, additional, Salojärvi, Jarkko, additional, Fernie, Alisdair R., additional, Novák, Ondřej, additional, Leyser, Ottoline, additional, Pałubicki, Wojtek, additional, Helariutta, Ykä, additional, and Nieminen, Kaisa, additional

Published
2023
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26. Flexure wood formation via growth reprogramming in hybrid aspen involves jasmonates and polyamines and transcriptional changes resembling tension wood development

Author

Urbancsok, János, primary, Donev, Evgeniy N., additional, Sivan, Pramod, additional, van Zalen, Elena, additional, Barbut, Félix R., additional, Derba‐Maceluch, Marta, additional, Šimura, Jan, additional, Yassin, Zakiya, additional, Gandla, Madhavi L., additional, Karady, Michal, additional, Ljung, Karin, additional, Winestrand, Sandra, additional, Jönsson, Leif J., additional, Scheepers, Gerhard, additional, Delhomme, Nicolas, additional, Street, Nathaniel R., additional, and Mellerowicz, Ewa J., additional

Published
2023
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42. Regulating plant physiology with organic electronics

Author

Poxson, David J., Karady, Michal, Gabrielsson, Roger, Alkattan, Aziz Y., Gustavsson, Anna, Doyle, Siamsa M., Robert, Stéphanie, Ljung, Karin, Grebe, Markus, Simon, Daniel T., and Berggren, Magnus

Published
2017

45. Development of flexible Organic Electronic Ion Pump for bioelectronic petiole feeding

Author

Bernacka-Wojcik, Iwona, primary, Stavrinidou, Eleni, additional, Abdel Aziz, Ilaria, additional, Simura, Jan, additional, Oikonomou, Vasileios K., additional, Rossi, Stefano, additional, Mohammadi, Mohsen, additional, Dar, Abdul Manan, additional, Talide, Loïc, additional, Berggren, Magnus, additional, Simon, Daniel T., additional, Tybrandt, Klas, additional, Jonsson, Magnus P., additional, Ljung, Karin, additional, Niittylä, Totte, additional, and Seitanidou, Maria, additional

Published
2023
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47. The PLETHORA Gene Regulatory Network Guides Growth and Cell Differentiation in Arabidopsis Roots

Author

Santuari, Luca, Sanchez-Perez, Gabino F., Luijten, Marijn, Rutjens, Bas, Terpstra, Inez, Berke, Lidija, Gorte, Maartje, Prasad, Kalika, Bao, Dongping, Timmermans-Hereijgers, Johanna L.P.M., Maeo, Kenichiro, Nakamura, Kenzo, Shimotohno, Akie, Pencik, Ales, Novak, Ondrej, Ljung, Karin, van Heesch, Sebastiaan, de Bruijn, Ewart, Cuppen, Edwin, Willemsen, Viola, Mähönen, Ari Pekka, Lukowitz, Wolfgang, Snel, Berend, de Ridder, Dick, Scheres, Ben, and Heidstra, Renze

Published
2016

48. Cell-surface receptors enable perception of extracellular cytokinins

Author

Antoniadi, Ioanna, Novák, Ondřej, Gelová, Zuzana, Johnson, Alexander, Plíhal, Ondřej, Simerský, Radim, Mik, Václav, Vain, Thomas, Mateo-Bonmatí, Eduardo, Karady, Michal, Pernisová, Markéta, Plačková, Lenka, Opassathian, Korawit, Hejátko, Jan, Robert, Stéphanie, Friml, Jiří, Doležal, Karel, Ljung, Karin, and Turnbull, Colin

Published
2020
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