Refereed Journal Publications:                     Also see vita Kopsell, D.A. and D.E. Kopsell. 2008. Genetic and environmental factors affecting plant lutein/zeaxanthin.  AgroFOOD industry Hi-tech 19(2):44-46. Kopsell, D.A., C.E. Sams, C.S. Charron, W.M. Randle, and D.E. Kopsell. 2007. Kale carotenoids remain stable while glucosinolates and flavor compounds respond to changes in selenium and sulfur fertility. Proceedings for the 1st International Symposium on Human Health Effects of Fruits and Vegetables. Acta Horticulturae 744:303-309. Toler, H.D., C.S. Charron, D.A. Kopsell, C.E. Sams, and W.M. Randle. 2007. Increasing selenium concentration in Brassica oleracea decreases glucosinolate concentration. Proceedings for the 1st International Symposium on Human Health Effects of Fruits and Vegetables. Acta Horticulturae 744:311-315. Kopsell, D.A., J.S. McElroy, C.E. Sams, and D.E. Kopsell. 2007. Genetic variation in carotenoid concentrations among diploid and amphidiploid Brassica species. HortScience 42(3):461-465. Lefsrud, M.G., D.A. Kopsell, and D.E. Kopsell. 2007. Nitrogen levels influence biomass, elemental accumulations, and pigment concentrations in spinach.  Journal of Plant Nutrition 30(2):171-185. Lefsrud, M.G., D.A. Kopsell, A. Wenzel, and J. Sheehan. 2007. Changes in kale ( Brassica oleracea L. var. acephala) carotenoid and chlorophyll pigment concentrations during leaf ontogeny. Scientia Horticulturae 112(2):136-141. Kopsell, D.A., D.E. Kopsell, and J. Curran-Celentano. 2007. Carotenoid pigments in kale are influenced by nitrogen concentration and form. Journal of the Science of Food and Agriculture 87(5):900-907. McElroy, J.S., D.A. Kopsell, J.C. Sorochan, and C.E. Sams. 2006. High and low irradiance adaptability of creeping bentgrass carotenoid composition. Crop Science 46(6):2606-2612. Kopsell, D.A., D.E. Kopsell, M.G. Lefsrud, A.J. Wenzel, C. Gerweck, and J. Curran-Celentano. 2006. Spinach cultigen variation for tissue carotenoid concentrations influence human serum carotenoid levels and macular pigment optical density following a twelve-week dietary intervention. Journal of Agricultural and Food Chemistry 54:7998-8005. Lefsrud, M.G. and D.A. Kopsell. 2006. Biomass production and pigment accumulation in kale grown under different radiation cycles in a controlled environment. HortScience 4:1412-1415. Kopsell, D.A. and D.E. Kopsell. 2006. Accumulation and bioavailability of carotenoids in vegetable crops. Trends in Plant Science 11:499-507. Lefsrud, M.G., D.A. Kopsell , R. Augé, and A.J. Both. 2006. Biomass production and pigment accumulation in kale grown under increasing photoperiods. HortScience 41(3):603-606. Lefsrud, M.G., D.A. Kopsell , D.E. Kopsell, and W.M. Randle. 2006. Kale carotenoids are unaffected by, whereas biomass production, elemental concentrations, and selenium accumulation respond to, changes in selenium fertility. J. Agric. Food Chem. 54(5):1764-1771. Lefsrud, M.G., D.A. Kopsell , D.E. Kopsell and J Curran-Celentano. 2006. Irradiance levels affect growth parameters and carotenoid pigments in kale and spinach grown in a controlled environment. Physiologia Plantarium Physiologia Plantarium 127:624-631. Wik, R.M., P.R. Fisher, D.A. Kopsell , and W.R. Argo. 2006. Iron form and concentration affect nutrition of container-grown Pelargonium and Calibrachoa . HortScience 41(1):244-251. Lefsrud, M.G., D.A. Kopsell , D.E. Kopsell, and J. Curran-Celentano. 2005. Air temperature affects biomass and carotenoid pigment accumulation in kale and spinach grown in a controlled environment. HortScience 40(7):2026-2030. Kopsell, D.A. , D.E. Kopsell, and J Curran-Celentano . 2005. Carotenoid and chlorophyll pigments in sweet basil grown in the field and greenhouse. HortScience 40(4):1230-1233. Kopsell, D.A., D.E. Kopsell, M.G. Lefsrud, J. Curran-Celentano, and L. Dukach. 2004. Variation in lutein, ?-carotene, and chlorophyll concentrations among Brassica oleracea cultigens and seasons. HortScience 39(2):361-364. Coolong, T.W., D.A. Kopsell, D.E. Kopsell, and W.M. Randle. 2004. Nitrogen and sulfur influence nutrient usage and accumulation in onion (Allium cepa L.). J. Plant Nutr. 27(9):1-20. Chenard, C.H., D.A. Kopsell, and D.E. Kopsell. 2005. Nitrogen concentration affects nutrient and carotenoid accumulation in parsley. J. Plant Nutr. 28(2): 285-297. Kopsell, D.E., D.A. Kopsell, M.G. Lefsrud, and J. Curran-celentano. 2004. Variability in elemental accumulations among leafy Brassica oleracea cultivars and selections. J. Plant Nutr. 27(10):1813-1826. Kopsell, D.E., D.A. Kopsell, W.M. Randle, T.W. Coolong, C.E. Sams, and J. Curran-Celentano. 2003. Kale carotenoids remain stable while flavor compounds respond to changes in sulfur fertility. J. Ag. Food Chem. 51(18):5319-5325. Kopsell, D.A., D.E. Kopsell, and W.M. Randle. 2003. Seed germination response of rapid-cycling Brassica oleracea grown under increasing sodium selenate. J. Plant Nutr. 26(7):1355-1366. Randle, W.M., D.E. Kopsell, and D.A. Kopsell. 2002. Sequentially reducing sulfate availability during onion growth and development affects bulb flavor at harvest. Hort. Sci. 37(1):118-121. Kopsell, D.A. and W.M. Randle. 2001. Genetic variance and selection potential for selenium accumulation in a rapid-cycling Brassica oleracea population. J. Amer. Soc. Hort. Sci. 126(3):329-335. Charron, C.S., D.A. Kopsell, W.M. Randle, and C.E. Sams. 2001. Sodium selenate fertilization increases selenium accumulation and decreases glucosinolate concentration in rapid-cycling Brassica oleracea. J. Sci. Food and Agric. 81(9):962-966. Kopsell, D.A., W.M. Randle, and H.A. Mills. 2000. Nutrient accumulation in the leaf tissue of rapid-cycling Brassica oleracea responds to increasing sodium selenate concentrations. J. Plant Nutrition 23(7):927-935. Kopsell, D.A. and W.M. Randle. 1999. Selenium accumulation in a rapid-cycling Brassica oleracea population responds to increasing sodium selenate concentrations. J. Plant Nutrition 22(6):927-937. Kopsell, D.A. and W.M. Randle. 1999. Selenium affects the S-alk(en)yl cysteine sulfoxides among short-day onion cultivars. J. Amer. Soc. Hort. Sci. 124(3):307-311. Randle, W.M., D.E. Kopsell, D.A. Kopsell, and R.L. Snyder. 1999. Total sulfur and sulfate accumulation in onions is affected by sulfur fertility. J. Plant Nutrition 22(1):45-51. Randle, W.M., D.A. Kopsell, D.E. Kopsell, R.L. Snyder, and R. Torrence. 1998. Field sampling short-day onions for bulb pungency. HortTechnology 8(3):329-332. Kopsell, D.A. and W.M. Randle. 1997. Selenate concentration affects selenium and sulfur uptake and accumulation by 'Granex 33' onions. J. Amer. Soc. Hort. Sci. 122(5):721-726. Kopsell, D.A. and W.M. Randle. 1997. Short-day onion cultivars differ in bulb selenium and sulfur accumulation which can affect bulb pungency. Euphytica 96(3):385-390. Book Chapters: Kopsell, D.A. and D.E. Kopsell. 2006. Selenium, pp. 515-550. In: A.V. Barker and D. Pilbeam (eds).  Handbook of plant nutrition. CRS Press – Taylor & Frances Group, Boca Raton, Fla. 613 p. Kopsell, D.E. and D.A. Kopsell. 2006. Copper, pp. 293-328. In: A.V. Barker and D. Pilbeam (eds).  Handbook of plant nutrition. CRS Press – Taylor & Frances Group, Boca Raton, Fla. 613 p. Contributed Papers: Kopsell, D.E. and D.A. Kopsell. 2004. It's in the leaves: high levels of carotenoids are found in dark-green leaves of spinach and kale. American Vegetable Grower May 2004:28 Kopsell, D.A. 2001. Kale (Brassica oleracea Acephala Group): Major health benefits from a minor crop. Proceedings of the New England Vegetable and Berry Conference. New England Vegetable and Berry Grower's Association. Sturbridge, MA. pp. 12-16. Kopsell, D.E. and D.A. Kopsell. 2001. Tips on surviving graduate school. Amer. Soc. Hort. Sci. Newsletter 17(5):4. Dean A. Kopsell, Ph.D., Assistant Professor, Plant Sciences Department Last Modified on 08-11-2004 9 Randle, W.M., D.E. Kopsell, and D.A. Kopsell. 1999. Considerations for implementing pungency field testing and its practical implications. Onion World 15(2):14-18. Kopsell, D.A. and W.M. Randle. 1998. The forms of selenium delivered by onions to human diets. Proceedings of the National Onion Research Conference. Sacramento, CA. pp. 179-182. Randle, W.M., D.E. Kopsell, and D.A. Kopsell. 1998. Considerations for implementing pungency field testing and its practical implications. Proceedings of the National Onion Research Conference. Sacramento, CA. pp. 171-173. Randle, W.M. and D.A. Kopsell. 1995. Selenium accumulation in onions and its effect on sulfur metabolism. Proceedings of the National Onion Research Conference. Madison, WI. pp. 84-90.