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.
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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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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DOI: https://doi.org/10.1007/s10658-010-9621-1