Ellen T. Paparozzi

Ellen T. Paparozzi


·Controlled Environment Agriculture: Greenhouses, Strawberries and More

Ellen T. Paparozzi


B.S., Plant Science, Cook College, Rutgers University, 1976

M.S., Floriculture & Ornamental Horticulture, Cornell University, Ithaca, NY, 1978

Ph.D., Floriculture & Ornamental Horticulture, Cornell University, Ithaca, NY, 1980

Areas of Focus

  • Plant Physiology (plant nutrition) and Anatomy
  • Floriculture and Ornamental Horticulture
  • Plant Physiology and Production Ecology

Research Interests


The purpose of our lab is to offer training to graduate students (and upper division undergraduate students) in research methods that involve the growing of floricultural and ornamental plants, and the execution complex plant nutritional experiments. We will train undergraduate and graduate students in sectioning and embedding plant material for light and fluorescence microscopy.

The laboratory technologist is Liz Conley, M. S. She coordinates all efforts in the laboratory and is responsible for equipment training, lab procedure training and equipment check-out. The lab is located in Rm.384 Plant Sciences and Liz can be be contacted at 2-2850 or via email at mconley2@unl.edu.

Research Focus

Our main research focus is on the broad topic of leaf yellowing and subsequent re-greening of leaves. We are approaching this topic using physiological, anatomical, and molecular biological methods.

Our current project right now involves Swedish ivy (2 species) and its ability to re-green after macronutrient and micronutrient deficiency. We have worked out re-greening timetables; protocols for protein separation by 2-D gel electrophoresis and total carbohydrate analysis also. We also view these symptoms utilizing light, fluorescence, confocal and electron microscopy.

Applied Research - Strawberries in Winter - sustainable horticulture

Research is underway to determine which cultivars of strawberries would grow best in the greenhouse during the winter. In order to do this, we are taking data on number and weight of berries per pot, nutraceutical characteristics and stolon production as well as light and moisture levels. Estimations of start-up costs for a poly greenhouse and costs of production are also part of this project. Collaborators on this project include: Dr. George Meyer, Biological Systems Engineering; Dr. Vicki Schlegel, Food Science; Dr. Erin Blankenship, Statistics; Dr. Paul Read, Horticulture; Associate Professors of Practice David Lambe MBA and Stacy Adams, M. S., and Ms M. Elizabeth Conley, MS, technologist. Please visit our website at agronomy.unl.edu/cea for more information.

Courses Taught


  • Thomas, D. and E. T. Paparozzi. 2013. Problems with detecting nutrient availability in experimental hydroponic solutions. J. Plant Nutrition in press.
  • Meyer, G.E., E.T. Paparozzi, E A. Walter-Shea, E.E. Blankenship, and S.A. Adams, 2012. An Investigation of reflective mulches for use over capillary mat systems for winter-time greenhouse strawberry production. Applied Engineering in Agriculture 28(2):271-279.
  • Lambe, D., S. A. Adams and E. T. Paparozzi. 2012. Estimating construction costs for a low-cost Quonset-style Greenhouse. UNL Extension Publication EC 104. 8 pp.
  • Paparozzi, Ellen T., K. A. Williams, R. Geneve, H. Hatterman-Valenti, C. Haynes, H. Kraus, C. McKenney and J. Pitts. 2011. Development of AG*IDEA Horticulture Graduate Certificates Program and Inter-institutional Course Share. HortTechnology 21:688-691.
  • Korus, K., M. E. Conley, E. E. Blankenship and E. T. Paparozzi. 2010. Storage and breakdown of starch aid P. parviflorus in leaf re-greening after nitrogen deficiency. Review of Undergraduate Research in Agriculture and the Life Sciences 15 (1):1-16.
  • Mello, A., N. A. Streck, E. E. Blankenship, and Ellen T. Paparozzi. 2009. Gibberellic Acid Promotes Seed Germination in Penstemon digitalis cv. Husker Red. HortScience 44: 870-873.
  • Paparozzi, E. T. 2008. Anatomical and physiological changes that occur during rooting of cuttings. In Plant Propagation Concepts and Laboratory Exercises. C. Beyl and R. Trigano. CRC Press (due out during Spring 2008).
  • Spaw, M., K. Williams, I. Mallberg, L. Hodges and E. T. Paparozzi. 2008. Bleeding hearts turn yellow: A case study to determine the cause of chlorosis in a crop of cut Dicentra spectabilis. HortTechnology 18:1-10. (featured in Spotlight section)
  • Widhalm, J. R., J. M Stone and E. T. Paparozzi. 2007. Nitrogen deficiency-induced senescent A. thaliana rosette leaves accumulate defense-related proteins. Plant biology and Botany Poster Abstracts. P. 59.
  • Kocamaz, C., E.T. Paparozzi and S. Kachman. 2006. Evaluation of alternative methods of applying sulfur fertilizers to chrysanthemum. J. Plant Nutrtition 29(2):361-374.
  • Guo, S. Stroup, W., Paparozzi, E. T. and M. E. Conley. 2006. A comparison of models and designs for experiments with nonlinear dose-response relationships. Proceedings 18th Conference on Applied Statistics in Agriculture. Manhattan, KS: Kansas State University Department of Statistics. pp. 214-241.
  • Paparozzi, E. T., W. W. Stroup and M. E. Conley. 2005. How to investigate four-way nutrient interactions in plants: A new look at response surface methods. Journal American Society for Horticultural Science 130(3):459-468. Cover photo
  • Thomas, D. M. and E. T. Paparozzi. 2004. Effect of chelates versus ionic salts of microelements and nitrogen form on hydroponic solution pH. J. Plant Nutrition 27: 1029-1041.
  • Paparozzi, E. T. 2003. Nutrition of floricultural crops: How far have we come? HortScience 38:1-5.
  • Paparozzi, E. T. and M . E. Conley. 2003. Choosing a model system for studies of leaf re-greening. Acta horticulturae 624: 323-327.
  • Williams, K. A. and E. T. Paparozzi. 2002. Model to develop a Synchronous, inter-institutional course using distance technologies. NACTA Journal 46:28-33.
  • Conley, M. E. , E. T. Paparozzi and W. W. Stroup. 2002. Leaf anatomical and nutrient concentration responses to nitrogen and sulfur applications in poinsettia. J. Plant Nutrition 25 (8):1773-1791.
  • Moreno-Sotomayor, A., A. Weiss, E. T. Paparozzi and T. J. Arkebauer. 2002. Leaf anatomy and light response curves of field grown maize as a function of age and nitrogen status. J. Plant Physiology 159(8):819-826.