Abstract
Cultivation of common hop (Humulus lupulus L.) has increased dramatically during the past decade, with the primary growth occurring in the Pacific Northwest of the United States. A major limitation to hop production is hop powdery mildew [caused by Podosphaera macularis (Wallr.) Braun & Takam]. To date, a comprehensive evaluation of wild hop germplasm resources for resistance to hop powdery mildew has yet to be conducted. Herein, we report the first extensive powdery mildew resistance screening of 244 wild H. lupulus populations (6,732 individuals) collected from North America and Eurasia. We used an elimination screening approach by sequentially inoculating four P. macularis isolates containing virulence on all previously described R genes. We detected the presence of powdery mildew resistance to isolates representing extant pathogenic diversity in seven germplasms (UMN-PMR-002 Male [Reg. no. GP-38, PI 699936], UMN-PMR-005 [Reg. no. GP-39, PI 699937], UMN-PMR-006 Female [GP-40, PI 699938], UMN-PMR-007 Male [Reg. no. GP-41, PI 699939], UMN-PMR-008 [Reg. no. GP-042, PI 699940], UMN-PMR-010 Male [Reg. no. GP-43, OU 699941], UMN-PMR-013 Female [Reg. no. GP-44, PI 699942]). Based upon genotypic profiling, the seven germplasms were identified in H. lupulus var. lupulus originating from Eurasia. These accessions could be used to introgress broad-spectrum powdery mildew resistance in hop breeding programs worldwide.
| Original language | English (US) |
|---|---|
| Journal | Journal of Plant Registrations |
| DOIs | |
| State | Accepted/In press - 2022 |
Bibliographical note
Funding Information:The authors express their gratitude to Dr. Peter Darby for providing technical advice with approaches to their experiments. The authors are grateful to Adam Schrankler and Casey McNichols for their assistance in carrying out the experiments and lastly, Yuka Kutsumi and Maxim Mallaliev for providing additional germplasm samples acquired under USDA Animal and Plant Health Inspection Service Permit to Import Plants and Plant Products (Permit # P37‐19‐02139). The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the research results reported within this paper. This work was supported by funding from the Minnesota Department of Agriculture (Award No. CON000000071123) and Hopsteiner, S. S. Steiner, Inc. JSH was also supported by fellowships from the Plant and Microbial Biology graduate program at the University of Minnesota.
Funding Information:
The authors express their gratitude to Dr. Peter Darby for providing technical advice with approaches to their experiments. The authors are grateful to Adam Schrankler and Casey McNichols for their assistance in carrying out the experiments and lastly, Yuka Kutsumi and Maxim Mallaliev for providing additional germplasm samples acquired under USDA Animal and Plant Health Inspection Service Permit to Import Plants and Plant Products (Permit # P37-19-02139). The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the research results reported within this paper. This work was supported by funding from the Minnesota Department of Agriculture (Award No. CON000000071123) and Hopsteiner, S. S. Steiner, Inc. JSH was also supported by fellowships from the Plant and Microbial Biology graduate program at the University of Minnesota.
Publisher Copyright:
© 2022 The Authors. Journal of Plant Registrations published by Wiley Periodicals LLC on behalf of Crop Science Society of America.
