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Oxylipins are not required for R gene-mediated resistance in potato

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Abstract

The role of 9- and 13-lipoxygenase-derived oxylipins for race-cultivar-specific resistance in potato was analyzed by expressing RNA interference constructs against oxylipin biosynthetic genes in transgenic potato plants carrying the resistance gene R1 against Phytophthora infestans. Down-regulation of 9-lipoxygenase expression resulted in highly reduced levels of 9-hydroxyoctadecatrienoic acid after treatment with the pathogen-associated molecular pattern Pep-13. However, neither 9-lipoxygenase nor 9-divinyl ether synthase RNAi plants exhibited alterations in their resistance to P. infestans. Similarly, successful down-regulation of transcript accumulation of the 13-lipoxygenase pathway genes encoding allene oxide cyclase, 12-oxophytodienoic acid reductase 3 and the jasmonic acid receptor coronatine-insensitive 1 resulted in highly reduced levels of jasmonic acid after Pep-13 treatment. Race-cultivar-specific resistance, however, was not lost in these plants. Our results suggest that neither 9-lipoxygenase-derived oxylipins nor jasmonic acid are required for R-gene-mediated resistance in potato. Importantly, in tobacco, the silencing of 9-lipoxygenase expression was previously demonstrated to suppress race-cultivar-specific resistance. Thus, we conclude a differential requirement of oxylipins for R-gene-mediated resistance in different solanaceous plants.

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Abbreviations

9-HOT:

9-hydroxyoctadecatrienoic acid

JA:

Jasmonic acid

LOX:

Lipoxygenase

NtLOX1 :

Nicotiana tabacum 9-lipoxygenase 1

PAMP:

Pathogen-associated molecular pattern

Ppn :

Phytophthora parasitica var. nicotianae

R :

Resistance gene

StAOC :

Solanum tuberosum allene oxide cyclase

StCOI1 :

S. tuberosum coronatine-insensitive 1

StLOX1 :

S. tuberosum 9-lipoxygenase 1

StDES :

S. tuberosum 9-divinyl ether synthase

StOPR3 :

S. tuberosum 12-oxophytodienoic acid reductase 3

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Acknowledgements

The excellent technical assistance of Angelika Weinel and Ulrike Smolka is gratefully acknowledged. We thank Prof. Felix Mauch for providing P. infestans 208m2, Sabine Freitag for help with 9-HOT analysis and Birgit Ortel for help with JA measurements. This work was funded by the Deutsche Forschungsgemeinschaft (SFB 648, TP A4).

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Correspondence to Sabine Rosahl.

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Lennart Eschen-Lippold and Simone Altmann contributed equally to the work.

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Eschen-Lippold, L., Altmann, S., Gebhardt, C. et al. Oxylipins are not required for R gene-mediated resistance in potato. Eur J Plant Pathol 127, 437–442 (2010). https://doi.org/10.1007/s10658-010-9621-1

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