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A poly(A) ribonuclease controls the cellotriose-based interaction between Piriformospora indica and its host Arabidopsis

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Michal Johnson,  Joy
IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society;

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Mrozinska,  Anna
IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society;

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Paetz,  Christian
Research Group Biosynthesis / NMR, MPI for Chemical Ecology, Max Planck Society;

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Schneider,  Bernd
Research Group Biosynthesis / NMR, MPI for Chemical Ecology, Max Planck Society;

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Svatoš,  Aleš
Research Group Mass Spectrometry, MPI for Chemical Ecology, Max Planck Society;

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Citation

Michal Johnson, J., Thürich, J., Petutschnig, E. K., Altschmied, L., Meichsner, D., Sherameti, I., et al. (2018). A poly(A) ribonuclease controls the cellotriose-based interaction between Piriformospora indica and its host Arabidopsis. Plant Physiology, 176(1), 2496-2514. doi:10.1104/pp.17.01423.


Cite as: http://hdl.handle.net/21.11116/0000-0000-3A9A-2
Abstract
Piriformospora indica, an endophytic root-colonizing fungus, efficiently promotes plant growth and induces resistance to abiotic stress and biotic diseases. The fungal cell wall extract induces cytoplasmic calcium [Ca2+]cyt elevation in host plant roots. Here, we show that an elici-tor-active cell wall moiety, released by P. indica into the medium, is cellotriose (CT). CT in-duces a mild defense-like response including the production of reactive oxygen species, changes in membrane potentials and the expression of genes involved in growth regulation and root development. CT based [Ca2+]cyt elevation in Arabidopsis roots does not require BAK1 coreceptor, or the putative Ca2+ channels TPC1, GLR3.3, -2.4 and -2.5 and operates synergistically with the elicitor chitin. We identified an ethylmethane-sulfonate-induced mu-tant ([Ca2+]cyt elevation mutant, cycam) impaired in response to CT, cellooligomers (n = 2, 4-7), but not to chitooligomers (n = 4-8) in roots. The mutant contains a single nucleotide ex-change in the gene encoding for a poly(A) ribonuclease (AtPARN, At1g55870) which de-grades poly(A) tails of specific mRNAs. The wild-type PARN cDNA, expressed under the control of a 35S promoter, complements the mutant phenotype. Our finding of cellotriose as a novel chemical mediator might help to understand the complex P. indica-plant mutual rela-tionship in beneficial symbiosis.