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⚠️ Information and Updates Regarding COVID-19's Impact on the College of Agricultural Sciences

Franck Dayan

Weed Science


Office: 111 Weed Research Lab
Lab: 101 Weed Research Lab
Phone: 662.816.6214

Lab Website: Weed Science Lab

Research Interests

I joined the faculty of in January 2016 after a 20-year career as a research plant physiologist for the USDA-ARS.  I am interested in functional plant genomics and my research program encompasses applied projects on herbicide mode of action and evolution of resistance in weeds to more basic projects aiming to use genomic approaches to decipher traits imparting weediness (competition, cold and heat stress tolerance etc…).  I am also interested in the relative contribution of each of the 3 wheat genomes to specific pathways associated with primary metabolism.  My expertise in plant biochemistry and physiology as well as chemical ecology complements the efforts already in place in other groups at Colorado State University.

Courses I Teach

Plant Biochemistry in Agriculture

This course is intended for graduate students in the plant sciences, such as botany, plant ecology, crop science, weed science or horticulture, but it is opened to other students with general interest in plants.

This course offers students an experiential learning environment leading to an appreciation of the role of plant biochemistry in agriculture. The structure and function of enzymes in metabolic pathways and the contributions of these pathways to plant growth and development will be covered. To that end, students will become proficient in basic modeling of proteins. When appropriate, topics are taught as problem-based situations related to plant production, stress responses, chemical ecology and the production of secondary metabolites of importance to mankind. Students will be able to critically read the scientific literature pertaining to plant biochemistry and metabolism.


Graduate Students I Advise

  • Abigail Barker – PhD in Weed Science
  • Raven Bough – PhD in BIAG
  • Hudson Takano – PhD in Weed Science
  • Mirella Farinelli Ortiz – PhD in Weed Science

Honors & Distinctions

Past President of the Phytochemical Society of North America, Past Treasurer of Phytochemical Society of North America and the International Weed Science Society, Associate editor of Weed Science and Pesticide Biochemistry and Physiology.  North American Editor of Outlooks on Pest Management.  Molisch Award from the International Allelopathy Society, 2017,  Outstanding Research Award from Weed Science Society of America, 2015, Senior Research Scientist of the Year (MSA) from USDA-ARS, 2012, Early Career Outstanding Scientist Award from the Weed Science Society of America, 2006. Grodzinsky Award from the International Allelopathy Congress in 2008, Early Career Research Scientist of the Year (MSA) from USDA-ARS in 2001.  Scientific refereed publications, 130; Other publications, 60.

Selected Publications

Herbicide Mode of Action and Mechanisms of Resistance

Oliveira, M. C., Gaines, T. D., Dayan, F. E., Patterson, E., Jhala, A. and Knezevic, S. 2017. Reversing resistance to tembotrione in the Amaranthus tuberculatus (syn. rudis) from Nebraska with cytochrome P450 inhibitors. Pest Management Science. Available online.

Dayan, F.E., Barker, A. and Tranel, P.J., 2017. Origins and Structure of Chloroplastic and Mitochondrial Plant Protoporphyrinogen Oxidases: Implications for Evolution of Herbicide Resistance. Pest Management Science. Available online

Carbonari, C., Latorre, D. O., Gomes, G. L. G. C., Velini, E. D., Owens, D. K., Pan, Z., and Dayan, F. E. 2016. Resistance to glufosinate is proportional to phosphinothricin acetyltransferase expression and activity in LibertyLink® and WideStrike® cotton. Planta 243:925-933.

Corniani, N., Velini, E. D., Silva, F. M. L., Nanayakkara, N. P. D., Witschel, M. and Dayan, F. E. Novel bioassay for the discovery of inhibitors of the 2-C-Methyl-d-erythritol 4-phosphate (MEP) and terpenoid pathways leading to carotenoid biosynthesis. PLoS ONE 9: e103704.

Corrêa, E. A., Dayan, F. E., Owens, D. K., Rimando, A. M., and Duke, S. O. 2016. Glyphosate-resistant and conventional canola (Brassica napus L.) responses to glyphosate and aminomethylphosphonic acid (AMPA) treatment. Journal of Agricultural and Food Chemistry 64:3508-3513.

Dayan, F. E., Owens, D. K., Corniani, N., Silva, F. M. L., Watson, S. B., Howell, J. and Shaner, D. L. 2015. Biochemical markers and enzyme assays for herbicide mode of action and resistance studies. Weed Science.  63, 23-63.

Dayan, F. E., Owens, D. K., Tranel, P. J., Preston, C. and Duke, S. O. 2014. Evolution of resistance to phytoene desaturase and protoporphyrinogen oxidase inhibitors – State of knowledge. Pest Management Science, 70: 1358-1366.

Garcia, A., Alarcon-Reverte, R., Watson, S. B., Abdallah, I., Dayan, F. E., Fischer, A. 2014. Concerted action of target-site mutations and high EPSPS activity in glyphosate-resistant junglerice (Echinochloa colona) from California. Pest Management Science, 71: 996-1007.

Maroli, A. S., Nandula, V. K., Dayan, F. E., Duke, S. O., Gerard, P., Tharayil, N. 2015. Metabolic profiling and enzyme analyses indicate a potential role of antioxidant systems in complementing glyphosate resistance in an Amaranthus palmeri Journal of Agricultural and Food Chemistry, 63:9199-9209.

Ribeiro, D. N., Nandula, V. K., Dayan, F. E., Rimando, A. M., Duke, S. O., Reddy, K. N., and Shaw. D. R. 2015. Possible glyphosate resistance mechanisms in pitted morningglory (Ipomoea lacunosa), Journal of Agricultural and Food Chemistry, 63:23-63.

Ribeiro, N. D., Pan, Z., Duke, S. O., Nandula, V. K., Baldwin, B. S., Shaw, D. and Dayan, F. E. Involvement of facultative apomixis in inheritance of EPSPS gene amplification in glyphosate-resistant Amaranthus palmeri.  Planta, 239:199-212.

Mentioned in

Salas, R. A., Scott, R. C., Dayan, F. E., and Burgos, N. R. 2015. EPSPS gene amplification in glyphosate-resistant in Italian ryegrass (Lolium perenne multiflorum) populations from Arkansas, United States. Journal of Agricultural and Food Chemistry, 63: 5885-5893.

Salas, R. A., Dayan, F. E., Pan, Z., Watson, S., Dickson, J., Scott, R. C., and Burgos, N. EPSPS gene amplification in glyphosate-resistant Italian ryegrass (Lolium perenne ssp multiflorum) from Arkansas, USA.  Pest Management Science, 68, 1223-1230.

Silva, F. M. L., Duke, S. O., Dayan, F. E. and Velini, E. D. 2016. Low doses of glyphosate change the response of soybean to subsequent glyphosate treatments. Weed Research 56:124-136.

Chemical Ecology and Natural Products

Pan, Z., Baerson, S. R., Wang, M., Bajsa‐Hirschel, J., Rimando, A. M., Wang, X., Nanayakkara, N. P. D., Noonan, B. P., Fromm, M. E., Dayan, F. E., Khan, I. A., and Duke, S. O. (2018). A cytochrome P450 CYP71 enzyme expressed in Sorghum bicolor root hair cells participates in the biosynthesis of the benzoquinone allelochemical sorgoleone. New Phytologist 218:616-629.

Głąb, L., Sowiński, J., Bough, R. and Dayan, F. E. 2017. Allelopathic potential of Sorghum bicolor (L.) Moench in weed control: A comprehensive review. Advances in Agronomy, 145:43-95.

Killeen, D. P., Larsen, L., Dayan, F. E., Gordon, K. C., Perry, N. B. and van Klink, J. W. 2016. Nortriketones: Antimicrobial trimethylated acylphloroglucinols from mānuka (Leptospermum scoparium). Journal of Natural Products 79:564-569

Cantrell, C. L., Dayan, F. E. and Duke, S. O. 2012. Natural products as sources for new pesticides. Journal of Natural Products, 75, 1231-1242.

Chen, X., Berim, A., Dayan. F. E., Gang, D. R. 2017. A (-)-Kolavenyl diphosphate synthase catalyzes the first committed step of salvinorin A biosynthesis in Salvia divinorum. Journal of Experimental Botany, 68:1109-1122.

Dayan, F. E., Owens, D. K., Watson, S. B., Asolkar, R. N. and Boddy, L. G. 2015. Sarmentine, a natural herbicide from Piper species with multiple herbicide mechanisms of action, Frontiers in Plant Science, 6. doi: 10.3389/fpls.2015.00222.

Dayan, F. E. and Duke, S. O. 2014. Natural compounds as next generation herbicides. Plant Physiology, 166:1090-1105. This article was selected as the lead article in this special issue of Plant Physiology.

Dayan, F. E., Owens, D. K. and Duke, S. O. 2012. Rationale for a natural products approach to herbicide discovery. Pest Management Science, 68, 519-528.

Głąb, L., Sowiński, J., Bough, R. and Dayan, F. E. 2017. Allelopathic potential of Sorghum bicolor (L.) Moench in weed control: A comprehensive review. Advances in Agronomy, in press.

Owens, D. K., Nanayakkara, N. P. D. and Dayan, F. E. In planta mechanism of action of leptospermone: Impact of its physico-chemical properties on uptake, translocation, and metabolism. Journal of Chemical Ecology. 39: 262-270.

Trivella, A., Stawingoga, M., Dayan, F. E., Cantrell, C. L., Mazellier, P., Richard, C. 2015. Photolysis of natural β-triketonic herbicides in water. Water Research, 78:28–36.

Patil, C., Calvayrac, C., Zhou, Y., Romdhane, S., Cooper, J.-F., Dayan, F. E. and Bertrand, C. 2016. Environmental Metabolic Footprinting: a novel application to study the impact of a natural and a synthetic ß-triketone herbicide in soil. Science of the Total Environment 566-567:552-558.

Rimando, A. M., Pan, Z., Polashock, J., Dayan, F. E., Mizuno, C., Snook, M. E., Liu, C.-J., and Baerson, S. R. 2012. In planta production of the highly potent resveratrol analogue pterostilbene via stilbene synthase and O-methyltransferase co-expression. Plant Biotechnology Journal, 10, 269-283.

Romdhane, S., Devers-Lamrani, M., Barthelmebs, L., Calvayrac, C., Bertrand, C., Cooper, J.-F., Dayan, F.E., Martin-Laurent, F. 2016. Ecotoxicological impact of the bioherbicide leptospermone on the microbial community of two arable soils. Frontiers in Microbiology 7:775.

Silva, F. M. L., Donega , M. A., Cerdeira, A. L., Corniani, N., Velini, E. D., Cantrell, C. L., Dayan, F. E., Coelho, M. N., Shea, K., Duke, S. O. 2014. Roots of the invasive species Carduus nutans and C. acanthoides L. produce large amounts of aplotaxene, a possible allelochemical. Journal of Chemical Ecology, 40:276-284.

Travaini, M. L., Sosa, G. M., Ceccarelli, E. A., Walter, H., Cantrell, C. L., Carrillo, N. J., Dayan, F. E., Meepagala, K. M. and Duke, S. O. Khellin and visnagin, furanochromones from Amni visnaga (L.) Lam., as potential bioherbicides. Journal of agricultural and food chemistry 64:9475-9487.

Uddin, M. R., Park, S. U., Dayan, F. E. and Pyon, J. Y. 2013. Herbicidal activity of formulated sorgoleone, a natural product of sorghum root exudate. Pesticide Management Science, 70:252-257.

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