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Identification of powdery mildew resistance QTL in Fragaria x ananassa

Helen M. Cockerton, Robert J. Vickerstaff, Amanda Karlström, Fiona Wilson, Maria Sobczyk, Joe Q. He, Daniel J. Sargent, Andy J. Passey, Kirsty J. McLeary, Katalin Pakozdi, Nicola Harrison, Maria Lumbreras-Martinez, Laima Antanaviciute, David W. Simpson, View ORCID ProfileRichard J. Harrison
doi: https://doi.org/10.1101/196485
Helen M. Cockerton
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Robert J. Vickerstaff
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Amanda Karlström
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Fiona Wilson
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Maria Sobczyk
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Joe Q. He
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Daniel J. Sargent
2Driscolls’ Genetics Ltd, East Malling Enterprise Center, New Road, East Malling, Kent, ME19 6BJ
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Andy J. Passey
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Kirsty J. McLeary
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Katalin Pakozdi
2Driscolls’ Genetics Ltd, East Malling Enterprise Center, New Road, East Malling, Kent, ME19 6BJ
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Nicola Harrison
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Maria Lumbreras-Martinez
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Laima Antanaviciute
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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David W. Simpson
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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Richard J. Harrison
1NIAB EMR, New Road, East Malling, Kent, ME19 6BJ
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  • ORCID record for Richard J. Harrison
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Abstract

The obligate biotrophic fungus Podosphaera aphanis is the causative agent of powdery mildew on cultivated strawberry (Fragaria x ananassa). Genotypes from two bi-parental mapping populations ‘Emily’ x ‘Fenella’ and ‘Redgauntlet’ x ‘Hapil’ were phenotyped for powdery mildew disease severity in a series of field trials. Here we report multiple QTL associated with resistance to powdery mildew, identified in ten phenotyping events conducted across different years and locations. Seven QTL show a level of stable resistance across multiple phenotyping events however many other QTL were represented in a single phenotyping event and therefore must be considered transient. One of the identified QTL was closely linked to an associated resistance gene across the wider germplasm. Furthermore, a preliminary association analysis identified a novel conserved locus for further investigation. Our data suggests that resistance is highly complex and that multiple additive sources of quantitative resistance to powdery mildew exist across strawberry germplasm. Implementation of the reported markers in marker-assisted breeding or genomic selection would lead to improved powdery mildew resistant strawberry cultivars, particularly where the studied parents, progeny and close pedigree material are included in breeding germplasm.

Key Message Powdery mildew resistance in two strawberry mapping populations is controlled by both stable and transient novel QTL of moderate effect. Some transferability of QTL across wider germplasm was observed.

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Posted January 18, 2018.
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Identification of powdery mildew resistance QTL in Fragaria x ananassa
Helen M. Cockerton, Robert J. Vickerstaff, Amanda Karlström, Fiona Wilson, Maria Sobczyk, Joe Q. He, Daniel J. Sargent, Andy J. Passey, Kirsty J. McLeary, Katalin Pakozdi, Nicola Harrison, Maria Lumbreras-Martinez, Laima Antanaviciute, David W. Simpson, Richard J. Harrison
bioRxiv 196485; doi: https://doi.org/10.1101/196485
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Identification of powdery mildew resistance QTL in Fragaria x ananassa
Helen M. Cockerton, Robert J. Vickerstaff, Amanda Karlström, Fiona Wilson, Maria Sobczyk, Joe Q. He, Daniel J. Sargent, Andy J. Passey, Kirsty J. McLeary, Katalin Pakozdi, Nicola Harrison, Maria Lumbreras-Martinez, Laima Antanaviciute, David W. Simpson, Richard J. Harrison
bioRxiv 196485; doi: https://doi.org/10.1101/196485

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