Genetic loci associated with tissue-specific resistance to powdery mildew in octoploid strawberry (Fragaria × ananassa)

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Lynn, S. C., Dunwell, J. M. orcid id iconORCID: https://orcid.org/0000-0003-2147-665X, Whitehouse, A. B. and Cockerton, H. M. (2024) Genetic loci associated with tissue-specific resistance to powdery mildew in octoploid strawberry (Fragaria × ananassa). Frontiers in Plant Science, 15. 1376061. ISSN 1664-462X doi: 10.3389/fpls.2024.1376061

Abstract/Summary

Powdery mildew is one of the most problematic diseases in strawberry production. To date, few commercial strawberry cultivars are deemed to have complete resistance and as such, an extensive spray programme must be implemented to control the pathogen. Here, a large-scale field experiment was used to determine the powdery mildew resistance status of leaf and fruit tissues across a diverse panel of strawberry genotypes. This phenotypic data was used to identify Quantitative Trait Nucleotides (QTN) associated with tissue-specific powdery mildew resistance. In total, six stable QTN were found to be associated with foliar resistance, with one QTN on chromosome 7D associated with a 61% increase in resistance. In contrast to the foliage results, there were no QTN associated with fruit disease resistance and there was a high level of resistance observed on strawberry fruit, with no genetic correlation observed between fruit and foliar symptoms, indicating a tissue-specific response. Beyond the identification of genetic loci, we also demonstrate that genomic selection can lead to rapid gains in foliar resistance across genotypes, with the potential to capture >50% of the genetic foliage resistance present in the population. To date, breeding of robust powdery mildew resistance in strawberry has been impeded by the quantitative nature of natural resistance and a lack of knowledge relating to the genetic control of the trait. These results address this shortfall, through providing the community with a wealth of information that could be utilized for genomic informed breeding, implementation of which could deliver a natural resistance strategy for combatting powdery mildew.

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Item Type Article
URI https://reading-clone.eprints-hosting.org/id/eprint/116212
Identification Number/DOI 10.3389/fpls.2024.1376061
Refereed Yes
Divisions Life Sciences > School of Agriculture, Policy and Development > Department of Crop Science
Uncontrolled Keywords GWAS, genomic selection, biotroph, plant pathogen, disease resistance
Publisher Frontiers
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