Ursula K. Frei

1.6k total citations
62 papers, 984 citations indexed

About

Ursula K. Frei is a scholar working on Plant Science, Genetics and Molecular Biology. According to data from OpenAlex, Ursula K. Frei has authored 62 papers receiving a total of 984 indexed citations (citations by other indexed papers that have themselves been cited), including 60 papers in Plant Science, 27 papers in Genetics and 22 papers in Molecular Biology. Recurrent topics in Ursula K. Frei's work include Genetic Mapping and Diversity in Plants and Animals (26 papers), Chromosomal and Genetic Variations (18 papers) and Plant Virus Research Studies (18 papers). Ursula K. Frei is often cited by papers focused on Genetic Mapping and Diversity in Plants and Animals (26 papers), Chromosomal and Genetic Variations (18 papers) and Plant Virus Research Studies (18 papers). Ursula K. Frei collaborates with scholars based in United States, Denmark and China. Ursula K. Frei's co-authors include Thomas Lübberstedt, G. Wenzel, Gerald N. De La Fuente, Yongzhong Xing, Bruno Studer, Torben Asp, Andreas Günter Lössl, Christopher M. Taylor, Jeppe Reitan Andersen and Louise Bach Jensen and has published in prestigious journals such as SHILAP Revista de lepidopterología, PLANT PHYSIOLOGY and Trends in Plant Science.

In The Last Decade

Ursula K. Frei

59 papers receiving 965 citations

Peers

Ursula K. Frei

GENET

EEBS

ACS

Yonghong Zhou China

Michaël Abrouk Czechia

Rouf Mian United States

A. E. Van Deynze United States

Gordon M. Huestis United States

David Benscher United States

Rajender Singh India

Timothy Sawbridge Australia

Reza Talebı Iran

Bernd Hackauf Germany

Yonghong Zhou China

Ursula K. Frei

908 ×1.0

232 ×0.7

GENET

273 ×0.8

204 ×1.9

EEBS

66 ×0.7

ACS

Citations per year, relative to Ursula K. Frei Ursula K. Frei (= 1×) peers Yonghong Zhou

Countries citing papers authored by Ursula K. Frei

Since Specialization

Citations

This map shows the geographic impact of Ursula K. Frei's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ursula K. Frei with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ursula K. Frei more than expected).

Fields of papers citing papers by Ursula K. Frei

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ursula K. Frei. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ursula K. Frei. The network helps show where Ursula K. Frei may publish in the future.

Co-authorship network of co-authors of Ursula K. Frei

This figure shows the co-authorship network connecting the top 25 collaborators of Ursula K. Frei. A scholar is included among the top collaborators of Ursula K. Frei based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Ursula K. Frei. Ursula K. Frei is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Wang, Hao, et al.. (2025). Genetic variation and heritability of haploid frailty in maize. Frontiers in Plant Science. 16. 1572901–1572901.

Frei, Ursula K., et al.. (2025). Multi-trait ridge regression BLUP with de novo GWAS improves genomic prediction for haploid induction ability of haploid inducers in maize. Frontiers in Plant Science. 16. 1614457–1614457. 1 indexed citations

Lübberstedt, Thomas, et al.. (2024). Doubled Haploid Technology: Opportunities and Challenges for the Rapid Generation of Maize Homozygous Lines. Cold Spring Harbor Protocols. 2025(3). pdb.top108437–pdb.top108437. 1 indexed citations

Lübberstedt, Thomas, et al.. (2024). Doubled Haploid Technology: Generation of Doubled Haploid Maize Lines Using Haploid Inducers. Cold Spring Harbor Protocols. 2025(3). pdb.prot108624–pdb.prot108624. 1 indexed citations

Frei, Ursula K., et al.. (2024). Genome-wide association study of haploid female fertility (HFF) and haploid male fertility (HMF) in BS39-derived doubled haploid maize lines. Theoretical and Applied Genetics. 138(1). 5–5.

Lübberstedt, Thomas, et al.. (2023). Development of maize inbred lines with elevated grain methionine concentration from a high methionine population. Crop Science. 63(4). 2417–2425. 5 indexed citations

Frei, Ursula K., et al.. (2023). A Comparison between Inbred and Hybrid Maize Haploid Inducers. Plants. 12(5). 1095–1095. 5 indexed citations

Abel, Craig A., et al.. (2023). Evaluating Founding Landraces of Maize Population PI 674097 for Resistance to Leaf-Feeding Spodoptera frugiperda1. Southwestern Entomologist. 48(1). 1 indexed citations

Jubery, Talukder Z., et al.. (2022). Protocols for In Vivo Doubled Haploid (DH) Technology in Maize Breeding: From Haploid Inducer Development to Haploid Genome Doubling. Methods in molecular biology. 2484. 213–235. 8 indexed citations

10.

Frei, Ursula K., et al.. (2020). Genomic prediction of maternal haploid induction rate in maize. The Plant Genome. 13(1). e20014–e20014. 15 indexed citations

11.

Frei, Ursula K., et al.. (2020). Breeding Maize Maternal Haploid Inducers. Plants. 9(5). 614–614. 34 indexed citations

12.

Frei, Ursula K., et al.. (2020). QTL mapping of spontaneous haploid genome doubling using genotyping-by-sequencing in maize (Zea mays L.). Theoretical and Applied Genetics. 133(7). 2131–2140. 15 indexed citations

13.

Studer, Bruno, et al.. (2017). Fine mapping a self-fertility locus in perennial ryegrass. Theoretical and Applied Genetics. 131(4). 817–827. 14 indexed citations

14.

Fuente, Gerald N. De La, Ursula K. Frei, & Thomas Lübberstedt. (2013). Accelerating plant breeding. Trends in Plant Science. 18(12). 667–672. 69 indexed citations

15.

Brazauskas, Gintaras, Yongzhong Xing, Bruno Studer, et al.. (2013). Identification of genomic loci associated with crown rust resistance in perennial ryegrass (Lolium perenne L.) divergently selected populations. Plant Science. 208. 34–41. 3 indexed citations

16.

Lübberstedt, Thomas & Ursula K. Frei. (2012). Application of doubled haploids for target gene fixation in backcross programmes of maize. Plant Breeding. 131(3). 449–452. 24 indexed citations

17.

Chen, Yongsheng, Hongjun Liu, M. Paul Scott, et al.. (2012). Genetic and physical fine mapping of the novel brown midrib gene bm6 in maize (Zea mays L.) to a 180 kb region on chromosome 2. Theoretical and Applied Genetics. 125(6). 1223–1235. 19 indexed citations

18.

Asp, Torben, Ursula K. Frei, Thomas Didion, Klaus K. Nielsen, & Thomas Lübberstedt. (2007). Frequency, type, and distribution of EST-SSRs from three genotypes of Lolium perenne, and their conservation across orthologous sequences of Festuca arundinacea, Brachypodium distachyon, and Oryza sativa. BMC Plant Biology. 7(1). 36–36. 56 indexed citations

19.

Möllers, Christian, Ursula K. Frei, & G. Wenzel. (1994). Field evaluation of tetraploid somatic potato hybrids. Theoretical and Applied Genetics. 88(2). 147–152. 17 indexed citations

20.

Lössl, Andreas Günter, Ursula K. Frei, & G. Wenzel. (1994). Interaction between cytoplasmic composition and yield parameters in somatic hybrids of S. tuberosum L.. Theoretical and Applied Genetics. 89-89(7-8). 873–878. 19 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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