Dr. Hagop Atamian

Dr. Hagop Atamian

Assistant Professor
Schmid College of Science and Technology; Biological Sciences
Office Location: Keck Center for Science and Engineering 261
American University of Beirut, Bachelor of Science
American University of Beirut, Master of Science
University of California, Riverside, Ph.D.



Postdoctoral Fellow, Dept. of Plant Biology, UC Davis (Mentor: Prof. Stacey L Harmer)

Ph.D. in Molecular Genetics, Dept. of Nematology, UC Riverside

M.S. in Plant Protection, Faculty of Agriculture and Food Science, American University of Beirut (Mentor: Prof. Yusuf Abou Jawdah)

Research Interests

Dr. Atamian’s research interests broadly aim at understanding the molecular mechanisms of plant interactions with the environment. These include biotic interactions (insects, bacteria, fungi, nematodes) and various biotic stresses (drought, cold, heat) as well as daily environmental fluctuations. He uses high throughput sequencing and molecular approaches together with physiological field experiments to better understand plant genotype x environment interactions. 


Biotic, abiotic, plant, genotype, transcriptome, genome, circadian clock, microbiome, hormone, light, temperature, pest, pathogen

Selected Publications

Click here for complete list of publications

Chaudhary R, Atamian HS (2017) Resistance-gene-mediated defense responses against biotic stresses in the crop model plant tomato. Journal of Plant Pathology and Microbiology 8:404.

Atamian HS, Creux NM, Brown EA, Garner AG, Blackman BK and Harmer SL (2016) Circadian regulation of sunflower heliotropism, floral orientation, and pollinator visits. Science 353: 587-590.

The article was featured on the cover of the August 2016 issue.

Atamian HS and Harmer SL (2016) Circadian regulation of hormone signaling and plant physiology. Plant Molecular Biology 91: 691–702.

Ouyang S, Park G, Atamian HS, Han CS, Stajich JE, Kaloshian I and Borkovich KA (2014) MicroRNAs suppress NB domain genes in tomato that confer resistance to Fusarium oxysporum. PLoS Pathogens 10: e1004464. 

Chaudhary R, Atamian HS, Shen Z, Briggs SP and Kaloshian I (2014) GroEL from the endosymbiont Buchnera aphidicola betrays the aphid by triggering plant defense. Proceedings of the National Academy of Sciences USA 111: 8919–8924.

Atamian HS, Chaudhary R, Dal Cin V, Girke T and Kaloshian I (2013) In planta expression or delivery of potato aphid Macrosiphum euphorbiae effectors Me10 and Me23 enhances aphid fecundity. Molecular Plant-Microbe Interactions 26: 67-74.

Atamian HS, Eulgem T and Kaloshian I (2012) SlWRKY70 is required for Mi-1-mediated resistance to aphids and nematodes in tomato. Planta 235: 299-309.

Bhattarai KK, Atamian HS, Kaloshian I and Eulgem T (2010) WRKY72-type transcription factors contribute to basal immunity in tomato and Arabidopsis as well as gene-for-gene resistance mediated by the tomato R gene Mi-1. The Plant Journal 63: 229–240.

Gerardo NM, Altincicek B, Anselme C, Atamian HS, Barribeau SM, de Vos M, Duncan E, Evans JD, Gabaldon T, Ghanim M, Heddi A, Kaloshian I, Latorre A, Moya A et al. (2010) Immunity and other defenses in pea aphids, Acyrthosiphon pisum. Genome Biology 11: R21.

Recent Creative, Scholarly Work and Publications

Quides K.W., Lee Y., Hur T. and Atamian H.S. (2023). Evaluation of qPCR to Detect Shifts in Population Composition of the Rhizobial Symbiont Mesorhizobium japonicum during Serial in Planta Transfers. Biology, 12(2), 277.
Atamian H.S., Davila, F.E.L. and Prakash A. (2023). A transcriptomic study of ‘Granny Smith’ apple fruit response to x-ray irradiation using RNA-Seq. Scientia Horticulturae, 311: 111777.
Ang D., Kendall R. and Atamian H.S. (2023) Virtual and in vitro screening of natural products identifies indole and benzene derivatives as inhibitors of SARS-CoV-2 main protease (Mpro). Biology, 12: 519.
Atamian H.S. and Funk J.L. (2023) Physiological and transcriptomic responses of two Artemisia californica populations to drought: implications for restoring drought-resilient native communities. Global Ecology and Conservation, 43: e02466
Ordaz N.A., Nagalakshmi U., Boiteux L.S., Atamian H.S., Ullman D. and Dinesh-Kumar S.P. (2023) The Sw-5b NLR immune receptor induces earlier transcriptional changes in response to thrips and mechanical modes of inoculation of Tomato spotted wilt orthotospovirus. Molecular Plant-Microbe Interactions, 36(11): 705-715.
Brooks C.J., Atamian H.S. and Harmer S.L. (2023) Multiple light signaling pathways control solar tracking in sunflowers. PLOS Biology, 21: e3002344.
Hassani M., Piechota T. and Atamian H.S. (2022) Prediction of cultivation areas for the commercial and an early flowering wild accession of Salvia hispanica L. in the United States. Agronomy 12 (7), 1651
Quides K.W. and Atamian H.S. (2021) A microbiome engineering framework to evaluate rhizobial symbionts of legumes. Plant and Soil 463: 631-642
Melo A.A.M., Olabode P.N., Atamian H.S., Nyakundi B., Pacioles C.T. and Prakash A. (2021) Irradiation reduces superficial scald by downregulating ethylene and a-farnesene biosynthetic enzymes in ‘Granny Smith’ apples. Radiation Physics and Chemistry 189: 109650.
Wimberley J., Cahill J. and Atamian H.S. (2020) De novo sequencing and analysis of Salvia hispanica tissue-specific transcriptome and identification of genes involved in terpenoid biosynthesis. Plants 9: 405-419