Marc W. van Iersel

NAME Marc W. van Iersel
TITLE Professor
PHONE 706-583-0284
FAX 706-542-0624
ADDRESS 1111 Miller Plant Science Building University of Georgia
Athens, Georgia 30602
EDUCATION Ph.D., Agronomy, University of Arkansas
M.S., Horticulture, Wageningen Agricultural University, The Netherlands
RESEARCH INTERESTS Photosynthesis, respiration, carbon use efficiency, drought stress, plant nutrition

Marc van Iersel


Dr. Marc van Iersel is a professor of horticulture at the University of Georgia, specializing in the physiology and nutrition of horticultural crops. He has worked in research, outreach, and teaching related to crop physiology and nutrition since 1994, focusing on carbon fixation of plant canopies. Focus areas of his work include the conversion of photosynthates into structural dry matter (carbon use efficiency), whole plant respiration and the separation of respiration into growth and maintenance components, environmental and nutritional effects on whole plant photosynthesis and respiration, and drought effects on plant growth and physiology. He has developed a system to continuously measure the whole plant gas exchange of up to 8 whole plants or small crop for periods up to two months, which has proven a valuable tool to look at carbon fixation by plants. Through his research, he has authored or coauthored 70+ peer reviewed journal articles, 4 book chapters and 40 conference papers.

He teaches environmental physiology, the capstone course in the horticulture undergraduate program at the University of Georgia and graduate courses in plant nutrition and photosynthesis. He serves as the vice-president of the American Society for Horticultural Science, in charge of its research division and is associate editor for the photosynthesis/source-sink physiology section of the Journal of the American Society for Horticultural Science.

Dr. van Iersel's research group currently has collaborative links with many UGA researchers, the University of Maine, the University of Bari and the University of Palermo in Italy, and Sunchon National University in South Korea.


Frantz, J.M., N.N. Cometti, M.W. van Iersel, and B. Bugbee. 2007. Rethinking acclimation of growth and maintenance respiration of tomato in elevated CO2: effects of a sudden change in light at different temperatures. Journal of Plant Ecology 31:695-710.

Van Iersel, M.W. 2006. Respiratory Q10 of marigold (Tagetes patula L.) in response to long-term temperature differences and its relation to growth and maintenance respiration. Physiologia Plantarum 128:289-301.

Klingeman, W.E., M.W. van Iersel, J.G. Kang, R.M. Augé, J.L. Moore and P.C. Flanagan. 2005. Whole-plant gas exchange measurements of mycorrhizal 'Iceberg' roses exposed to cyclic drought. Crop Protection 24:309-317.

Van Iersel, M. 2004. Light, photosynthesis and plant growth. In: E. Runkle and P. Fisher (eds.) Lighting up profits. Understanding greenhouse lighting. p. 18-20, 22-24. Meister publishing, Willoughby, Ohio. (ISBN 1-892829-10-X)

Nemali, K.S. and M.W. van Iersel. 2004. Acclimation of wax begonia to light intensity: Changes in photosynthesis, respiration, and chlorophyll concentration. Journal of the American Society for Horticultural Science 129:745-751.

Nemali, K.S. and M.W. van Iersel. 2004. Light effects on wax begonia: photosynthesis, growth respiration, maintenance respiration, and carbon use efficiency. Journal of the American Society for Horticultural Science 129:416-424.

Earl, H.J., J.A. Ferrell, W.K. Vencill, M.W. van Iersel, and M.A. Czarnota. 2004. Effects of three herbicides on whole plant carbon fixation and water use by yellow nutsedge (Cyperus esculentus). Weed Science 52:213-216.

Van Iersel, M.W. 2003. Carbon use efficiency depends on growth respiration, maintenance respiration, and relative growth rate. A case study with lettuce. Plant, Cell & Environment 26:1441-1449.

Van Iersel, M.W. 2003. Carbon exchange rates of four bedding plant species as affected by short-term temperature changes. Journal of the American Society for Horticultural Science 128:100-106.

Schwarz, D., H.-P. Kläring, M.W. van Iersel, and K.T. Ingram. 2002. Growth and photosynthetic response of tomato to nutrient solution concentration at two light levels. Journal of the American Society for Horticultural Science 127:984-990.

Miller, A.M., M.W. van Iersel, and A.M. Armitage. 2001. Whole plant CO2 exchange responses of Angelonia angustifolia to temperature and irradiance. Journal of the American Society for Horticultural Science 125:606-610.

Van Iersel, M.W. and B. Bugbee. 2000. A semi-continuous, multi-chamber crop CO2-exchange system: design, calibration, and data interpretation. Journal of the American Society for Horticultural Science 125:86-92.