ArticleFrontiers in plant science2014
Role of auxin during intercellular infection of Discaria trinervis by Frankia.
Article in Frontiers in plant science, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed, 24 citations in OpenAlex.
- Article
- Recent Advances in Adventitious Root Formation in Chestnut.Plants (Basel, Switzerland) · 2020Review
- A Homeotic Mutation Changes Legume Nodule Ontogeny into Actinorhizal-Type Ontogeny.The Plant cell · 2020Article
- Accumulation of and Response to Auxins in Roots and Nodules of the Actinorhizal PlantFrontiers in plant science · 2019Article
- MtLAX2, a Functional Homologue of the Arabidopsis Auxin Influx Transporter AUX1, Is Required for Nodule Organogenesis.Plant physiology · 2017Article
- Recent advances in actinorhizal symbiosis signaling.Plant molecular biology · 2016Review
- The Control of Auxin Transport in Parasitic and Symbiotic Root-Microbe Interactions.Plants (Basel, Switzerland) · 2015Review
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Authors and funding
10 authors at 5 institutions in 3 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Nitrogen-fixing nodules induced by Frankia in the actinorhizal plant Discaria trinervis result from a primitive intercellular root invasion pathway that does not involve root hair deformation and infection threads. Here, we analyzed the role of auxin in this intercellular infection pathway at the molecular level and compared it with our previous work in the intracellular infected actinorhizal plant Casuarina glauca. Immunolocalisation experiments showed that auxin accumulated in Frankia-infected cells in both systems. We then characterized the expression of auxin transporters in D. trinervis nodules. No activation of the heterologous CgAUX1 promoter was detected in infected cells in D. trinervis. These results were confirmed with the endogenous D. trinervis gene, DtAUX1. However, DtAUX1 was expressed in the nodule meristem. Consistently, transgenic D. trinervis plants containing the auxin response marker DR5:VENUS showed expression of the reporter gene in the meristem. Immunolocalisation experiments using an antibody against the auxin efflux carrier PIN1, revealed the presence of this transporter in the plasma membrane of infected cells. Finally, we used in silico cellular models to analyse auxin fluxes in D. trinervis nodules. Our results point to the existence of divergent roles of auxin in intercellularly- and intracellularly-infected actinorhizal plants, an ancestral infection pathways leading to root nodule symbioses.
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