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Research Report

Genetic Mapping of Pierce’s Disease Resistance in Germplasm Collected from the Southwestern United States and Mexico

View ORCID ProfileSummaira Riaz, Alan Tenscher, M. Andrew Walker
Am J Enol Vitic.  2023  74: 0740026  ; DOI: 10.5344/ajev.2023.23006
Summaira Riaz
1Crop Diseases, Pests and Genetics Research Unit, USDA-ARS San Joaquin Valley Agricultural Sciences Center, Parlier, California, United States of America;
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  • ORCID record for Summaira Riaz
  • For correspondence: Summaira.riaz@usda.gov
Alan Tenscher
1Crop Diseases, Pests and Genetics Research Unit, USDA-ARS San Joaquin Valley Agricultural Sciences Center, Parlier, California, United States of America;
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M. Andrew Walker
2Department of Viticulture and Enology, University of California, Davis, California 95616 USA.
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Abstract

Background and goals Pierce’s disease (PD) is an important grapevine disease in California and other warm grapegrowing areas in North America. Farming grape cultivars with natural resistance to the disease that have broader genetic base is an effective approach in high-pressure PD regions. The goal of this study was to genetically characterize PD resistance in three new accessions, b40-14 and b41-14, both collected from Mexico, and T03-16, collected from Texas.

Methods and key findings Simple sequence repeat (SSR) marker-based genetic maps that cover all 19 grape chromosomes were developed for b40-14 and b41-14, while the genetic map for T03-16 was developed only for chromosome 14. Quantitative trait locus (QTL) analysis was carried out by interval mapping, using parental and consensus maps for all three backgrounds. The QTL analysis identified a major locus in the three accessions on chromosome 14, within the genetic window of the previously-identified PD resistance locus PdR1. This increases the total to 13 known accessions with a major QTL for PD resistance in a similar genomic region.

Conclusions and significance All three accessions have major, but not complete, effect QTL for PD resistance on chromosome 14, indicating that other minor QTLs may be present in other genomic regions. Larger populations and map resolution are required to identify all minor QTLs.

  • PdR1 locus
  • Pierce’s disease
  • Southwestern US
  • transition zone
  • Vitis arizonica
  • Received January 2023.
  • Accepted June 2023.
  • Published online August 2023
  • Copyright © 2023 by the American Society for Enology and Viticulture. All rights reserved.
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Genetic Mapping of Pierce’s Disease Resistance in Germplasm Collected from the Southwestern United States and Mexico
View ORCID ProfileSummaira Riaz, Alan Tenscher, M. Andrew Walker
Am J Enol Vitic.  2023  74: 0740026  ; DOI: 10.5344/ajev.2023.23006
Summaira Riaz
1Crop Diseases, Pests and Genetics Research Unit, USDA-ARS San Joaquin Valley Agricultural Sciences Center, Parlier, California, United States of America;
  • Find this author on Google Scholar
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  • ORCID record for Summaira Riaz
  • For correspondence: Summaira.riaz@usda.gov
Alan Tenscher
1Crop Diseases, Pests and Genetics Research Unit, USDA-ARS San Joaquin Valley Agricultural Sciences Center, Parlier, California, United States of America;
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M. Andrew Walker
2Department of Viticulture and Enology, University of California, Davis, California 95616 USA.
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Genetic Mapping of Pierce’s Disease Resistance in Germplasm Collected from the Southwestern United States and Mexico
View ORCID ProfileSummaira Riaz, Alan Tenscher, M. Andrew Walker
Am J Enol Vitic.  2023  74: 0740026  ; DOI: 10.5344/ajev.2023.23006
Summaira Riaz
1Crop Diseases, Pests and Genetics Research Unit, USDA-ARS San Joaquin Valley Agricultural Sciences Center, Parlier, California, United States of America;
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Summaira Riaz
  • For correspondence: Summaira.riaz@usda.gov
Alan Tenscher
1Crop Diseases, Pests and Genetics Research Unit, USDA-ARS San Joaquin Valley Agricultural Sciences Center, Parlier, California, United States of America;
  • Find this author on Google Scholar
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M. Andrew Walker
2Department of Viticulture and Enology, University of California, Davis, California 95616 USA.
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