Clarence A. Ryan

30.4k citations

230 papers · 22.8k indexed · 8 hit papers · h-index 78

Impact in

Insect Science top 0.01%
- Insect-Plant Interactions and Control
- Insect and Pesticide Research
Plant Science top 0.01%
- Plant-Microbe Interactions and Immunity
- Plant Parasitism and Resistance
- Plant Stress Responses and Tolerance
- Plant Molecular Biology Research

Papers in

Insect Science 52
- Insect and Pesticide Research 29
- Entomopathogenic Microorganisms in Pest Control 22
Plant Science 116
- Plant-Microbe Interactions and Immunity 53
- Plant Stress Responses and Tolerance 26
- Plant Molecular Biology Research 22

Co-authors: Gregory Pearce Edward E. Farmer Martha L. Orozco-Cárdenas Javier Narváez-Vásquez Daniel R. Bergey Alisa Huffaker Yube Yamaguchi Gregg A. Howe
Journals: Proceedings of the National Academy of Sciences (40 papers)PLANT PHYSIOLOGY (39 papers)Journal of Biological Chemistry (19 papers)The Plant Cell (14 papers)Planta (10 papers)
Partner nations: United States Japan Germany

In The Last Decade

Clarence A. Ryan

230 papers receiving 21.6k citations

Hit Papers

8 papers align trajectories log scale

Hydrogen Peroxide Acts as a Second Messenger for the Induction of Defense Genes in Tomato Plants in Response to Wounding, Systemin, and Methyl Jasmonate 2001 · 747 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

2001 The Plant Cell
1999 Proceedings of the National Academy of Sciences
1992 The Plant Cell
1991 Science
1990 Annual Review of Phytopathology
1990 Proceedings of the National Academy of Sciences
1973 Annual Review of Plant Physiology
1972 Science

Peers

Countries citing papers authored by Clarence A. Ryan

Since Specialization

Citations

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

Fields of papers citing papers by Clarence A. Ryan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Clarence A. Ryan. 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 Clarence A. Ryan. The network helps show where Clarence A. Ryan may publish in the future.

Co-authors

The 25 scholars most cited alongside Clarence A. Ryan, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Clarence A. Ryan Line = papers co-authored together Clarence A. Ryan links everyone, so they are left out of the graph.

All Works

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

20 of 20 papers shown

#	Work
1	Ca ² ⁺ signaling by plant Arabidopsis thaliana Pep peptides depends on AtPepR1, a receptor with guanylyl cyclase activity, and cGMP-activated Ca ²⁺ channels Proceedings of the National Academy of Sciences ·Zhi Qi, Rajeev Verma, Chris Gehring, Yube Yamaguchi, Yichen Zhao, Clarence A. Ryan, Gerald A. Berkowitz	2010	199
2	PEPR2 Is a Second Receptor for the Pep1 and Pep2 Peptides and Contributes to Defense Responses in Arabidopsis The Plant Cell ·Yube Yamaguchi, Alisa Huffaker, Anthony C. Bryan, Frans E. Tax, Clarence A. Ryan	2010	370
3	Structure–activity studies of GmSubPep, a soybean peptide defense signal derived from an extracellular protease Peptides ·Gregory Pearce, Gerhard R. Munske, Yube Yamaguchi, Clarence A. Ryan	2010	20
4	Systemic wound signaling in tomato leaves is cooperatively regulated by systemin and hydroxyproline-rich glycopeptide signals Plant Molecular Biology ·Javier Narváez-Vásquez, Martha L. Orozco-Cárdenas, Clarence A. Ryan	2007	30
5	Unbound Form of Tomato Inhibitor-II Reveals Interdomain Flexibility and Conformational Variability in the Reactive Site Loops Journal of Biological Chemistry ·R.K. Bhatt, Kenneth Ng, M.M. Cherney, Gregory Pearce, Usman Ghani, Clarence A. Ryan, Michael N.G. James	2003	23
6	The systemin receptor SR160 from Lycopersicon peruvianum is a member of the LRR receptor kinase family Proceedings of the National Academy of Sciences ·Justin M. Scheer, Clarence A. Ryan	2002	218
7	RALF, a 5-kDa ubiquitous polypeptide in plants, arrests root growth and development Proceedings of the National Academy of Sciences ·Gregory Pearce, Daniel S. Moura, Johannes W. Stratmann, Clarence A. Ryan	2001	342
8	Characterization and localization of a wound-inducible type I serine-carboxypeptidase from leaves of tomato plants ( Lycopersicon esculentum Mill.) Planta ·Daniel S. Moura, Daniel R. Bergey, Clarence A. Ryan	2001	60
9	Wound- and systemin-inducible calmodulin gene expression in tomato leaves Plant Molecular Biology ·Daniel R. Bergey, Clarence A. Ryan	1999	61
10	Octadecanoid-redived signals in plants Trends in Cell Biology ·Edward E. Farmer, Clarence A. Ryan	1992	63
11	A Polypeptide from Tomato Leaves Induces Wound-Inducible Proteinase Inhibitor Proteins Science ·Gregory Pearce, Daniël J. Strydom, S.A. Johnson, Clarence A. Ryan Hit paper breakdown →	1991	758
12	Tissue and Cellular Localization of Proteinase Inhibitors I and II in the Fruit of the Wild Tomato, Lycopersicon peruvianum (L.) Mill PLANT PHYSIOLOGY ·Vincent P. M. Wingate, Vincent R. Franceschi, Clarence A. Ryan	1991	18
13	Uniquely Regulated Proteinase Inhibitor I Gene in a Wild Tomato Species PLANT PHYSIOLOGY ·Vincent P. M. Wingate, Clarence A. Ryan	1991	8
14	Engineering Proteinase Inihibitor Genes For Plant Defense Against Predators UNI ScholarWorks (University of Northern Iowa) ·Clarence A. Ryan, Thomas D. Moloshok, Gregory Pearce, Abdel Boudries., Robert W. Thornburg, Gerald E. Hall, Russell R. Johnson, Edward E. Farmer, Curtis Palm	1990	2
15	Oral administration of proteinase inhibitor II from potatoes reduces energy intake in man Physiology & Behavior ·Andrew J. Hill, Steven Peikin, Clarence A. Ryan, John E. Blundell	1990	66
16	Regulation of expression of a wound-inducible tomato inhibitor I gene in transgenic nightshade plants Plant Molecular Biology ·Russell R. Johnson, Jong Lee, Clarence A. Ryan	1990	8
17	Oligosaccharide Signalling in Plants PubMed ·Clarence A. Ryan	1987	133
18	Purification and Characterization of the Carboxypeptidase Isoinhibitors from Potatoes PLANT PHYSIOLOGY ·G. Michael Hass, Xiao Li, D. J. Makus, Clarence A. Ryan	1979	16
19	Evidence for the presence of proteinase inhibitor I in vacuolar protein bodies of plant cells Planta ·L. K. Shumway, Derrick Crook, Clarence A. Ryan	1976	28
20	Immunological Similarities of Proteinase Inhibitors from Potatoes PLANT PHYSIOLOGY ·Clarence A. Ryan, Ebru Turgal	1976	6

About Clarence A. Ryan

Clarence A. Ryan is a scholar working on Insect Science, Plant Science, Biotechnology, Molecular Biology and Microbiology, having authored 230 papers that have together received 22.8k indexed citations. Recurring topics across this work include Insect Resistance and Genetics (89 papers), Plant-Microbe Interactions and Immunity (53 papers), Plant Reproductive Biology (29 papers), Insect and Pesticide Research (29 papers), Plant Stress Responses and Tolerance (26 papers), Plant tissue culture and regeneration (24 papers), Entomopathogenic Microorganisms in Pest Control (22 papers) and Plant Molecular Biology Research (22 papers). The work is most often cited by research in Insect Science (6.3k citations), Plant Science (16.2k citations), Biotechnology (2.1k citations), Molecular Biology (12.3k citations) and Ecology, Evolution, Behavior and Systematics (1.9k citations). Clarence A. Ryan has collaborated with scholars based in United States, Japan and Germany. Frequent co-authors include Gregory Pearce, Edward E. Farmer, Martha L. Orozco-Cárdenas, Javier Narváez-Vásquez, Daniel R. Bergey, Alisa Huffaker, Yube Yamaguchi, Gregg A. Howe, Johannes W. Stratmann and S.A. Johnson. Their work appears in journals such as Proceedings of the National Academy of Sciences, PLANT PHYSIOLOGY, Journal of Biological Chemistry, The Plant Cell and Planta.

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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