Identification of quantitative trait loci associated with R1-mediated resistance to powdery mildew and sex determination in hop (Humulus lupulus L.).

Autor: Havill JS; Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA., Richardson BJ; Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, 97331, USA., Rohwer CL; Southern Research and Outreach Center, University of Minnesota, Waseca, MN, 56093, USA., Gent DH; Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, 97331, USA.; Forage Seed and Cereal Research Unit, USA Department of Agriculture - Agricultural Research Service, Corvallis, OR, 97331, USA., Henning JA; Forage Seed and Cereal Research Unit, USA Department of Agriculture - Agricultural Research Service, Corvallis, OR, 97331, USA., Muehlbauer GJ; Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA. muehl003@umn.edu.
Jazyk: angličtina
Zdroj: TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik [Theor Appl Genet] 2023 Jun 15; Vol. 136 (7), pp. 154. Date of Electronic Publication: 2023 Jun 15.
DOI: 10.1007/s00122-023-04399-7
Abstrakt: Key Message: Two QTL were identified using linkage mapping approaches, one on hop linkage group 3 (qHl_Chr3.PMR1) associated with powdery mildew resistance and a second on linkage group 10 (cqHl_ChrX.SDR1) associated with sex determination. Hop (Humulus lupulus L.) is a dioecious species cultivated for use in beer. Hop powdery mildew, caused by Podosphaera macularis, is a constraint in many growing regions. Thus, identifying markers associated with powdery mildew resistance and sex provides the opportunity to pyramid R-genes and select female plants as seedlings, respectively. Our objectives were to characterize the genetic basis of R1-mediated resistance in the cultivar Zenith which provides resistance to pathogen races in the US, identify quantitative trait loci (QTL) associated with R1 and sex, and develop markers for molecular breeding-based approaches. Phenotypic evaluation of the population indicated that R1-based resistance and sex are inherited monogenically. We constructed a genetic map using 1339 single nucleotide polymorphisms (SNPs) based upon genotype-by-sequencing of 128 F 1 progeny derived from a Zenith × USDA 21058M biparental population. SNPs were assigned to 10 linkage groups comprising a map length of 1204.97 cM with an average density of 0.94 cM/marker. Quantitative trait locus mapping identified qHl_Chr3.PMR1, associated with R1 on linkage group 3 (LOD = 23.57, R 2  = 57.2%), and cqHl_ChrX.SDR1, associated with sex on linkage group 10 (LOD = 5.42, R 2  = 25.0%). Kompetitive allele-specific PCR (KASP) assays were developed for both QTL and assessed against diverse germplasm. Our results indicate that KASP markers associated with R1 may be limited to materials that are pedigree-related to Zenith, whereas markers associated with sex may be transferable across populations. The high-density map, QTL, and associated KASP markers will enable selecting for sex and R1-mediated resistance in hop.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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