Cytokinin Plays a Multifaceted Role in Ralstonia solanacearum-Triggered Plant Disease Development
Cytokinin signalling plays both positive and negative roles in plant resistance to pathogens. It is not clear whether the role ofcytokinin changes at the different stages of pathogen infection. Arabidopsis thaliana sequentially exhibits distinct root mor-phological symptoms during Ralstonia solanace...
| Autores: | , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/376188 |
| Acceso en línea: | http://hdl.handle.net/10261/376188 https://api.elsevier.com/content/abstract/scopus_id/85213016256 |
| Access Level: | acceso abierto |
| Palabra clave: | Bacterial wilt Cytokinin Plant immunity Ralstonia solanacearum Root disease symptoms |
| Sumario: | Cytokinin signalling plays both positive and negative roles in plant resistance to pathogens. It is not clear whether the role ofcytokinin changes at the different stages of pathogen infection. Arabidopsis thaliana sequentially exhibits distinct root mor-phological symptoms during Ralstonia solanacearum infection, which offers a good system to investigate function of cytokininin the whole pathogen infection process. Using this system, we found increase of cytokinin signalling by Lonely Guy 2 (LOG2)overexpression or depletion of type-A Arabidopsis Response Regulators (ARRs), negative regulators of cytokinin signalling path-way, promoted cell death, wilting symptom and bacterial growth, but attenuated primary root growth inhibition and lateral rootformation. The decrease of cytokinin signalling by mutation on Isopentenyl Transferases (IPTs) inhibited root hair formation, celldeath, wilting symptom and bacterial colonisation. Application of different concentration of exogenesis 6-benzylaminopurine(6-BA) showed first promoted, then decreased root hair formation. Moreover, application of 6-BA accelerated cell death but sup-pressed lateral root formation and primary root growth inhibition. The diverse roles of cytokinin in these different root diseasephenotypes suggested function of cytokinin during plant responses to R. solanacearum is cell type-specific, which provides newinsights on roles of cytokinin signalling in regulation on plant–pathogen interactions. |
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