title: Nuclear Ca2+signalling in arbuscular mycorrhizal and actinorhizal endosymbioses: on the trail of novel underground signals.
abstract: Contents 533 I. 533 II. 534 III. 536 IV. 536 537 References 537 SUMMARY: Root endosymbioses are beneficial associations formed between terrestrial plants and either bacterial or fungal micro-organisms. A common feature of these intracellular symbioses is the requirement for mutual recognition between the two partners before host-regulated microbial entry. As part of this molecular dialogue, symbiosis-specific microbial factors set in motion a highly conserved plant signal transduction pathway, of which a central component is the activation of sustained nuclear Ca2+oscillations in target cells of the host epidermis. Here, we focus on recent findings concerning this crucial Ca2+-dependent signalling step for endosymbiotic associations involving either arbuscular mycorrhizal fungi or nitrogen-fixing Frankia actinomycetes, and in particular how this knowledge is contributing to the identification of the respective microbial factors.
authors.affiliation: Laboratory of Plant-Microbe Interactions (LIPM), INRA-CNRS-Toulouse University, 31326, Castanet-Tolosan, France.
authors.forename: David G
authors.initials: DG
authors.lastname: Barker
authors.affiliation: Laboratory of Plant-Microbe Interactions (LIPM), INRA-CNRS-Toulouse University, 31326, Castanet-Tolosan, France.
authors.forename: Mireille
authors.initials: M
authors.lastname: Chabaud
authors.affiliation: Department of Life Sciences and Systems Biology, Turin University, Viale Mattioli 25, 10125, Turin, Italy.
authors.forename: Guilia
authors.initials: G
authors.lastname: Russo
authors.affiliation: Department of Life Sciences and Systems Biology, Turin University, Viale Mattioli 25, 10125, Turin, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Genre
mesh_terms: D039903:Actinobacteria / Q000378:metabolism*; D020013:Calcium Signaling; D002467:Cell Nucleus / Q000378:metabolism*; D038821:Mycorrhizae / Q000378:metabolism*; D015398:Signal Transduction; D013559:Symbiosis
keywords: LysM receptor-like kinases; chitin oligomers; common symbiotic signalling pathway; in vivo calcium reporters; nuclear calcium spiking; plant-microbe interactions; root endosymbiosis