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Bohle F, Klaus A, Ingelfinger J, Tegethof H, Safari N, Schwarzländer M, Hochholdinger F, Hahn M, Meyer AJ, Acosta IF, Müller-Schüssele SJ. Contrasting cytosolic glutathione redox dynamics under abiotic and biotic stress in barley as revealed by the biosensor Grx1-roGFP2. J Exp Bot 2024; 75:2299-2312. [PMID: 38301663 DOI: 10.1093/jxb/erae035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 01/29/2024] [Indexed: 02/03/2024]
Abstract
Barley is a staple crop of major global importance and relatively resilient to a wide range of stress factors in the field. Transgenic reporter lines to investigate physiological parameters during stress treatments remain scarce. We generated and characterized transgenic homozygous barley lines (cv. Golden Promise Fast) expressing the genetically encoded biosensor Grx1-roGFP2, which indicates the redox potential of the major antioxidant glutathione in the cytosol. Our results demonstrated functionality of the sensor in living barley plants. We determined the glutathione redox potential (EGSH) of the cytosol to be in the range of -308 mV to -320 mV. EGSH was robust against a combined NaCl (150 mM) and water deficit treatment (-0.8 MPa) but responded with oxidation to infiltration with the phytotoxic secretome of the necrotrophic fungus Botrytis cinerea. The generated reporter lines are a novel resource to study biotic and abiotic stress resilience in barley, pinpointing that even severe abiotic stress leading to a growth delay does not automatically induce cytosolic EGSH oxidation, while necrotrophic pathogens can undermine this robustness.
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Affiliation(s)
- Finja Bohle
- Molecular Botany, Department of Biology, RPTU Kaiserslautern-Landau, D-67633 Kaiserslautern, Germany
- Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Alina Klaus
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Julian Ingelfinger
- Molecular Botany, Department of Biology, RPTU Kaiserslautern-Landau, D-67633 Kaiserslautern, Germany
| | - Hendrik Tegethof
- Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Nassim Safari
- Phytopathology, Department of Biology, RPTU Kaiserslautern-Landau, D-67633 Kaiserslautern, Germany
| | - Markus Schwarzländer
- Institute of Plant Biology and Biotechnology, University of Münster, D-48143 Münster, Germany
| | - Frank Hochholdinger
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Matthias Hahn
- Phytopathology, Department of Biology, RPTU Kaiserslautern-Landau, D-67633 Kaiserslautern, Germany
| | - Andreas J Meyer
- Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Ivan F Acosta
- Max Planck Institute for Plant Breeding Research, D-50829 Cologne, Germany
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