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De Cuyper C, Fromentin J, Yocgo RE, De Keyser A, Guillotin B, Kunert K, Boyer FD, Goormachtig S. From lateral root density to nodule number, the strigolactone analogue GR24 shapes the root architecture of Medicago truncatula. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:137-46. [PMID: 25371499 DOI: 10.1093/jxb/eru404] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In the rhizosphere, strigolactones not only act as crucial signalling molecules in the communication of plants with parasitic weeds and arbuscular mycorrhiza, but they also play a key role in regulating different aspects of the root system. Here we investigated how strigolactones influence the root architecture of Medicago truncatula. We provide evidence that addition of the synthetic strigolactone analogue GR24 has an inhibitory effect on the lateral root density. Moreover, treatment with GR24 of Sinorhizobium meliloti-inoculated M. truncatula plants affects the nodule number both positively and negatively, depending on the concentration. Plants treated with 0.1 µM GR24 had a slightly increased number of nodules, whereas concentrations of 2 and 5 µM strongly reduced it. This effect was independent of the autoregulation of nodulation mechanism that is controlled by SUPER NUMERIC NODULE. Furthermore, we demonstrate that GR24 controls the nodule number through crosstalk with SICKLE-dependent ethylene signalling. Additionally, because the expression of the nodulation marker EARLY NODULATION11 was strongly reduced in GR24-treated plants, we concluded that strigolactones influence nodulation at a very early stage of the symbiotic interaction.
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Affiliation(s)
- Carolien De Cuyper
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium Department of Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Justine Fromentin
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium Department of Plant Systems Biology, VIB, 9052 Ghent, Belgium Laboratoire des Interactions Plantes-Microorganismes, Unité Mixte de Recherche 441, Institut National de la Recherche Agronomique, F-31326 Castanet-Tolosan, France Laboratoire des Interactions Plantes-Microorganismes, Unité Mixte de Recherche 2594, Centre National de la Recherche Scientifique, F-31326 Castanet-Tolosan, France
| | - Rosita Endah Yocgo
- Laboratoire des Interactions Plantes-Microorganismes, Unité Mixte de Recherche 441, Institut National de la Recherche Agronomique, F-31326 Castanet-Tolosan, France
| | - Annick De Keyser
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium Department of Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Bruno Guillotin
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium Department of Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Karl Kunert
- Plant Science Department, Forestry and Agricultural Biotechnology Institute, University of Pretoria, 0083 Pretoria, South Africa
| | - François-Didier Boyer
- Institut National de la Recherche Agronomique, Institut Jean-Pierre Bourgin, Unité Mixte de Recherche 1318, Equipe de Recherche Labellisée Centre National de la Recherche Scientifique 3559, Saclay Plant Sciences, RD10, F-78026 Versailles, France AgroParisTech, Institut Jean-Pierre Bourgin, Unité Mixte de Recherche 1318, Equipe de Recherche Labellisée Centre National de la Recherche Scientifique 3559, Saclay Plant Sciences, RD10, F-78026 Versailles, France Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, Unité Propre de Recherche 2301, Centre National de la Recherche Scientifique, F-91198 Gif-sur-Yvette, France
| | - Sofie Goormachtig
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium Department of Plant Systems Biology, VIB, 9052 Ghent, Belgium
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