terclim by ICS banner
IVES 9 IVES Conference Series 9 Mgaloblishvili Rpv29 and Rpv31 loci reveal new insights on downy mildew resistance sources in Vitis vinifera

Mgaloblishvili Rpv29 and Rpv31 loci reveal new insights on downy mildew resistance sources in Vitis vinifera

Abstract

Downy mildew, a disease caused by Plasmopara viticola (Berk. et Curt.) Berl. and De Toni, is one of the strongest threats to grapevine (Vitis vinifera L.) production. Recently, sources of resistance to downy mildew were identified among Caucasian germplasm. Among them, the Georgian variety Mgaloblishvili revealed a unique resistance mechanism. A genome wide association study (GWAS) allowed the identification of the genetic bases of Mgaloblishvili resistance, the loci Rpv29, Rpv30 and Rpv31. To dissect the three resistance loci, Mgaloblishvili genome was sequenced using PacBio HiFi reads and assembled. A chromosome-scale diploid genome assembly consisting of ~ 986 Mb and a contig N50 length of 25.8 Mb was obtained. A total of 58,912 protein-coding genes were predicted on the two sets of phased chromosomes. A whole genome comparison with the genome of the susceptible reference accession PN40024 was performed. Mgaloblishvili resistance loci were in-depth analyzed in terms of structure, gene content, gene expression and impact of structural variants (SVs) and SNPs (Single Nucleotide Polymorphisms). Furthermore, using DNA sequencing data of Mgaloblishvili self-cross progeny, resistance haplotypes were identified for Rpv30 and Rpv31. The obtained data highlighted Mgaloblishvili resistant phenotype as a consequence of multiple small SVs and SNPs, that eventually results into differential transcriptional regulation. Altogether, these genetic resources will increase the knowledge about downy mildew-grapevine pathosystem. Moreover, they will be available for breeding programs aiming to develop grapevine resistant varieties.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Article

Authors

Valentina Ricciardi 1, Andrea Minio 2, Melanie Massonnet 2, Alexander H.J. Wittenberg3, David Maghradze 4,5,6, Silvia Laura Toffolatti 1, Osvaldo Failla 1, Dario Cantù 2*, Gabriella De Lorenzis

1 Department of Agricultural and Environmental Sciences, University of Milan
2 Department of Viticulture and Enology, University of California, Davis (CA), USA
3 KeyGene, Wageningen, The Netherlands
4 Caucasus International University, Tbilisi, Georgia
5 Georgian Technical University, Tbilisi, Georgia
6National Wine Agency of Georgia, Tbilisi, Georgia

Contact the author*

Keywords

Grapevine, biotic stress, QTL, genome, Caucasus

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

VITIGEOSS Business Service: Task scheduling optimization in vineyards

Agriculture plantations are complex systems whose performance critically depends on the execution of several types of tasks with precise timing and efficiency to respond to different external factors. This is particularly true for orchards like vineyards, which need to be strictly monitored and regulated, as they are sensitive to diverse types of pests, and climate conditions. In these environments, managing and optimally scheduling the available work force and resources is not trivial and is usually done by teams of senior managers based on their experience. In this regard, having a baseline schedule could help them in the decision process and improve their results, in terms of time and resources spent.

Southern Oregon Ava landscape and climate for wine production

The Southern Oregon American Viticultural Area (AVA) consists of the Applegate Valley, Rogue Valley, Umpqua Valley, Elkton Oregon, and Red Hills of Douglas County sub-AVAs (Figure 1) that are some of the many winegrape producing regions found within the intermountain valleys along the west coast of the United States.

From vine to wine: integrating conventional and advanced analytical techniques to support breeding. A Barbera, Croatina, and Ervi pivotal study

The introduction of new grapevine varieties has long accompanied viticulture and enology, enabling the emergence of new wine styles and ensuring the continuity of oenological practice.

An effective method for extracting high-quality RNA from grapevine

Grapevine (Vitis vinifera L.) is one of the most important economic crops in the world. Because of this importance, one finds widespread molecular genetic research on this species, an important element of which is high quality RNA.

Vineyard innovative tools based on the integration of earth observation services and in-field sensors (VitiGEOSS project)

Climate change is having an unprecedented impact on the wine industry, which is one of the major agricultural sectors around the world. Global warming, combined with the variation in rainfall patterns and the increase in frequency of extreme weather events, is significantly influencing vine physiology and exposing, more frequently, plants to severe biotic and abiotic stresses. This represents a challenge for viticulturists who need to take complex decisions to adjust vineyard management and achieve oenological goals.