Christen D. Upper

4.7k total citations · 1 hit paper
45 papers, 3.3k citations indexed

About

Christen D. Upper is a scholar working on Plant Science, Molecular Biology and Cell Biology. According to data from OpenAlex, Christen D. Upper has authored 45 papers receiving a total of 3.3k indexed citations (citations by other indexed papers that have themselves been cited), including 35 papers in Plant Science, 9 papers in Molecular Biology and 9 papers in Cell Biology. Recurrent topics in Christen D. Upper's work include Plant Pathogenic Bacteria Studies (18 papers), Plant-Microbe Interactions and Immunity (15 papers) and Legume Nitrogen Fixing Symbiosis (10 papers). Christen D. Upper is often cited by papers focused on Plant Pathogenic Bacteria Studies (18 papers), Plant-Microbe Interactions and Immunity (15 papers) and Legume Nitrogen Fixing Symbiosis (10 papers). Christen D. Upper collaborates with scholars based in United States, Chile and Russia. Christen D. Upper's co-authors include Susan S. Hirano, D. C. Arny, S. S. Hirano, Steven E. Lindow, Charles A. West, Julianne Lindemann, John P. Helgeson, David T. Dennis, W.R. Barchet and Luís J. Corcuera and has published in prestigious journals such as Nature, Proceedings of the National Academy of Sciences and Journal of Biological Chemistry.

In The Last Decade

Christen D. Upper

44 papers receiving 3.0k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Bacteria in the Leaf Ecosystem with Emphasis onPseudomonas syringae—a Pathogen, Ice Nucleus, and Epiphyte

2000 665 citations Susan S. Hirano, Christen D. Upper profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Christen D. Upper United States	25	2.3k	641	571	358	313	45	3.3k
P. E. Kolattukudy United States	32	2.6k 1.1×	1.1k 1.8×	543 1.0×	308 0.9×	215 0.7×	49	4.1k
W. Oßwald Germany	24	1.8k 0.8×	914 1.4×	738 1.3×	170 0.5×	141 0.5×	78	2.3k
Andreas von Tiedemann Germany	33	3.8k 1.6×	762 1.2×	1.2k 2.2×	226 0.6×	192 0.6×	134	4.4k
Sergio Sgorbati Italy	28	2.0k 0.9×	1.0k 1.6×	128 0.2×	346 1.0×	170 0.5×	73	3.3k
Edward A. Baker United States	35	2.1k 0.9×	478 0.7×	130 0.2×	972 2.7×	129 0.4×	122	3.9k
V. Demoulin Belgium	22	1.2k 0.5×	1.1k 1.7×	581 1.0×	428 1.2×	78 0.2×	92	3.0k
Mary C. Wildermuth United States	27	4.4k 1.9×	1.9k 2.9×	332 0.6×	89 0.2×	633 2.0×	42	5.5k
Emory G. Simmons United States	17	1.6k 0.7×	399 0.6×	1.4k 2.4×	200 0.6×	47 0.2×	45	2.6k
Andrea Ghirardo Germany	30	1.5k 0.7×	858 1.3×	139 0.2×	177 0.5×	439 1.4×	73	2.5k
Klaus Høiland Norway	21	1.6k 0.7×	420 0.7×	602 1.1×	371 1.0×	57 0.2×	64	2.3k

Countries citing papers authored by Christen D. Upper

Since Specialization

Citations

This map shows the geographic impact of Christen D. Upper'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 Christen D. Upper with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Christen D. Upper more than expected).

Fields of papers citing papers by Christen D. Upper

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Christen D. Upper. 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 Christen D. Upper. The network helps show where Christen D. Upper may publish in the future.

Co-authorship network of co-authors of Christen D. Upper

This figure shows the co-authorship network connecting the top 25 collaborators of Christen D. Upper. A scholar is included among the top collaborators of Christen D. Upper 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 Christen D. Upper. Christen D. Upper is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Newcomb, Maria, Christen D. Upper, & D. I. Rouse. (2010). Factors Contributing to Seasonal Fluctuations in Rust Severity onRibes missourienseCaused byCronartium ribicola. Phytopathology. 100(10). 986–996. 10 indexed citations

Upper, Christen D., S. S. Hirano, S. E. Lindow, E. I. Hecht-Poinar, & V. J. Elliott. (2002). Revisiting the roles of immigration and growth in the development of populations of Pseudomonas syringae in the phyllosphere.. 69–79. 5 indexed citations

Hirano, S. S., et al.. (1997). Contribution of the Regulatory Gene lemA to Field Fitness of Pseudomonas syringae pv. syringae. Applied and Environmental Microbiology. 63(11). 4304–4312. 31 indexed citations

Hirano, S. S., et al.. (1996). Raindrop Momentum Triggers Growth of Leaf-Associated Populations of Pseudomonas syringae on Field-Grown Snap Bean Plants. Applied and Environmental Microbiology. 62(7). 2560–2566. 65 indexed citations

Hirano, S. S. & Christen D. Upper. (1993). Dynamics, spread, and persistence of a single genotype of Pseudomonas syringae relative to those of its conspecifics on populations of snap bean leaflets. Applied and Environmental Microbiology. 59(4). 1082–1091. 23 indexed citations

Clayton, Murray K., et al.. (1989). Periodic spatial patterns of bacterial brown spot in a 90 m snap bean row segment. Phytopathology. 79(10). 1162. 4 indexed citations

Hirano, S. S. & Christen D. Upper. (1985). Ecology and physiology of Pseudomonas syringae. Biotechnology(Faisalabad). 3(12). 1073–1078. 5 indexed citations

Hirano, Susan S., et al.. (1985). Ice Nucleation Temperature of Individual Leaves in Relation to Population Sizes of Ice Nucleation Active Bacteria and Frost Injury. PLANT PHYSIOLOGY. 77(2). 259–265. 66 indexed citations

Lindow, Steven E., Susan S. Hirano, W.R. Barchet, D. C. Arny, & Christen D. Upper. (1982). Relationship between Ice Nucleation Frequency of Bacteria and Frost Injury. PLANT PHYSIOLOGY. 70(4). 1090–1093. 85 indexed citations

10.

Lindow, Steven E., D. C. Arny, & Christen D. Upper. (1982). Bacterial Ice Nucleation: A Factor in Frost Injury to Plants. PLANT PHYSIOLOGY. 70(4). 1084–1089. 227 indexed citations

11.

Schrader, L. E., et al.. (1982). Effects of Freezing Field‐Grown Soybean Plants at Various Stages of Podfill on Yield and Seed Quality¹. Crop Science. 22(1). 73–78. 13 indexed citations

12.

Woodward, Michael D., Luís J. Corcuera, Heinrich K. Schnoes, John P. Helgeson, & Christen D. Upper. (1979). Identification of 1,4-Benzoxazin-3-ones in Maize Extracts by Gas-Liquid Chromatography and Mass Spectrometry. PLANT PHYSIOLOGY. 63(1). 9–13. 26 indexed citations

13.

Woodward, Michael D., Luís J. Corcuera, John P. Helgeson, A. Kelman, & Christen D. Upper. (1979). Quantitation of 1,4-Benzoxazin-3-ones in Maize by Gas-Liquid Chromatography. PLANT PHYSIOLOGY. 63(1). 14–19. 34 indexed citations

14.

Corcuera, Luís J., Michael D. Woodward, John P. Helgeson, A. Kelman, & Christen D. Upper. (1978). 2,4-Dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H)-one, an Inhibitor from Zea mays with Differential Activity against Soft Rotting Erwinia Species. PLANT PHYSIOLOGY. 61(5). 791–795. 77 indexed citations

15.

Woodward, Michael D., Luís J. Corcuera, John P. Helgeson, A. Kelman, & Christen D. Upper. (1978). Factors That Influence the Activity of 2,4-Dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H)-one on Erwinia Species in Growth Assays. PLANT PHYSIOLOGY. 61(5). 803–805. 16 indexed citations

16.

Woodward, Michael D., Luís J. Corcuera, John P. Helgeson, & Christen D. Upper. (1978). Decomposition of 2,4-Dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H)-one in Aqueous Solutions. PLANT PHYSIOLOGY. 61(5). 796–802. 117 indexed citations

17.

Upper, Christen D., John P. Helgeson, & Geraldine T. Haberlach. (1970). Limitation of Tobacco Callus Tissue Growth by Carbohydrate Availability. PLANT PHYSIOLOGY. 46(1). 118–122. 14 indexed citations

18.

Upper, Christen D., et al.. (1970). Gas-Liquid Chromatographic Isolation of Cytokinins from Natural Sources. PLANT PHYSIOLOGY. 45(5). 543–547. 53 indexed citations

19.

Helgeson, John P. & Christen D. Upper. (1970). Modification of Logarithmic Growth Rates of Tobacco Callus Tissue by Gibberellic Acid. PLANT PHYSIOLOGY. 46(1). 113–117. 10 indexed citations

20.

Helgeson, John P., et al.. (1969). Control of Logarithmic Growth Rates of Tobacco Callus Tissue by Cytokinins. PLANT PHYSIOLOGY. 44(2). 193–198. 14 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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