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ARS Home » Pacific West Area » Parlier, California » San Joaquin Valley Agricultural Sciences Center » Crop Diseases, Pests and Genetics Research » Research » Publications at this Location » Publication #393301

Research Project: Breeding Prunus and Vitis Scions for Improved Fruit Quality and Durable Pest Resistance

Location: Crop Diseases, Pests and Genetics Research

Title: Genetic characterization of Pierce’s Disease resistance in a Vitis arizonica/monticola wild grapevine

Author
item HUERTA-ACOSTA, KARLA GABRIELA - Snfl Group
item Riaz, Summaira
item TENSCHER, ALAN - University Of California, Davis
item WALKER, ANDREW - University Of California, Davis

Submitted to: American Journal of Enology and Viticulture
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/24/2022
Publication Date: N/A
Citation: N/A

Interpretive Summary: Durable field resistance to any disease requires broader genetic base. Pierce's disease (PD) caused by bacteria is an important grape disease and currently major locus PdR1 is being used in the breeding programs. This study explored and characterized PD resistance from an accession b46-43, collected from Texas.

Technical Abstract: Pierce’s Disease (PD) is a bacterial disease that threatens vineyards across the US and Mexico. Genetic resistance against this disease has been achieved using the resistance locus PdR1, which was found in a wild grapevine from Mexico. In order to stack genes for broader and long-lasting resistance, we aimed to identify sources of resistance different than PdR1 to broaden genetic resistance to PD. The objective of this study was to characterize the genetic resistance in population 14399, a hybrid population derived from accession b46-43, a PD resistant wild grapevine from Texas. It was hypothesized b46-43’s resistance differs from PdR1 and that it contains an alternative source of genetic resistance to PD. A total of 318 individuals from population 14399 were evaluated for PD resistance and genotyped to build a framework genetic map and run a quantitative trait locus (QTL) analysis. The QTL analysis explained 55.5% of the phenotypic variation on chromosome 14, suggesting the presence of PdR1. Unfortunately, no minor loci were identified on other chromosomes. The rarity of additional loci indicates that PD resistance may have a common origin and it is widespread as a result of gene flow.