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Transcriptome analysis of early downy mildew (Plasmopara viticola) defense in grapevines carrying the Asian resistance locus Rpv10

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Abstract

The oomycete Plasmopara viticola (Berk. & Curt.) Berl. & de Toni causes downy mildew, one of the most devastating diseases of grapevine (Vitis vinifera L.). Traditional European grapevine cultivars are highly susceptible to this obligate biotrophic pathogen. Large amounts of fungicides are necessary to protect the grapevine plants and secure harvest. This strong requirement for protective chemicals conflicts with the modern demand for sustainability in agriculture. A significant reduction of chemical protection is possible by generating novel robust grapevine cultivars through resistance breeding. Current grapevine breeding utilizes marker-assisted genetic selection. The aim is to combine diverse resistance loci for durable resistance. Markers tagging various resistance loci were elaborated during the last 10 years. However, knowledge about the conveyed defense mechanisms is still sparse but would be essential to optimize the combination of resistance loci. Asian Vitis amurensis accessions carry resistance against downy mildew e.g. in the Rpv10 locus. This locus has been introgressed into the resistant grapevine cultivar ‘Solaris’ and was genetically mapped to chromosome nine. To understand its mode of action in early defense reactions we performed a comparative RNA sequencing analysis after pathogen challenge of Rpv10-carriers, Rpv10-carriers containing additionally the resistance locus Rpv3 from American Vitis sp. origin and non-Rpv carriers. This study indicated comprehensive transcriptional re-programming and a large number of differentially expressed genes. The data indicates that the difference between resistant and susceptible grapevines relies in the increased amount of responsive genes and the efficiency of early signal transduction. This results in the fast activation of large gene clusters encoding phenylalanine ammonium lyase and stilbene synthase on chromosome 16.

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Acknowledgements

This project was co-financed by the European Union—European Regional Development Fund (ERDF) (A23 partial)—as part of the program INTERREG IV Upper Rhine (“Transcending borders with every project”). It was additionally supported by the Research Foundation of German Viticulture of the German Association of Agriculture (Forschungsring des Deutschen Weinbaus bei der DLG) (Rpv10). We wish to thank the Breeding Department of the Institute of Grapevine Breeding Geilweilerhof for the contribution of data on markers linked to Plasmopara viticola resistance in grapevine genetic resources.

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Correspondence to Eva Zyprian.

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Fröbel, S., Dudenhöffer, J., Töpfer, R. et al. Transcriptome analysis of early downy mildew (Plasmopara viticola) defense in grapevines carrying the Asian resistance locus Rpv10. Euphytica 215, 28 (2019). https://doi.org/10.1007/s10681-019-2355-z

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  • DOI: https://doi.org/10.1007/s10681-019-2355-z

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