Juan Carlos Melgar
Assistant Professor of Pomology
Horticulture Program Team, Plant and Environmental Sciences Department, Public Service Activities
Office: BRC 218
Ph.D. Crop Production and Protection
University of Cordoba, Spain 2006
B.S. Agricultural Engineering
University of Cordoba, Spain 2000
Just Fruits, Horticulture 4550/6550
I have worked with fruit tree species under different climates for the last 15 years, including semiarid climates in the Mediterranean Basin (Spain and Italy) and subtropical humid climate in Florida, Texas and South Carolina. My research program is a combination of basic and applied research, in this case almost always driven by real problems that fruit tree growers have. I am also committed to inspire students and stimulate their interest and critical thinking.
My research in the last years focused on optimization of nutritional management, water-saving strategies, variety evaluations, horticultural practices that increase the value of agricultural products, and on the effect of biotic and abiotic stresses in physiological responses in peach, blackberry and citrus.
Extension and Outreach
My extension goals are to solve problems in fruit tree growing that can have significant economic, social and environmental impacts
Zhou, Q. and Melgar, J.C. 2020. Tree age influences nutrient partitioning among annually removed aboveground organs of peach. HortScience (in press)
Lawrence, B., Melgar, J.C., Dallmann, M., Ouellette, D., Mengjun, H. and Schnabel, G. 2020. Field performance and susceptibility to fungal pathogens of eleven blackberry cultivars. International Journal of Fruit Science (accepted)
Zhou, Q. and Melgar, J.C. 2019. Ripening season affects tissue mineral concentration and nutrient partitioning in peach trees. Journal of Plant Nutrition and Soil Science 182: 203-209.
Simpson, C.R., Melgar, J.C., Nelson, S.D. and Sétamou, M. 2019. Growth and yield responses under different grove management strategies for water conservation in young grapefruit trees. Scientia Horticulturae 256: 108567.
Allran, J., Schnabel, G. and Melgar, J.C. 2019. Peach bagging in the Southeastern U.S. Journal of the American Pomological Society 73: 38-46.
Kunta, M., Guzman, L., Garcia, A.C., del Rio, H.S., Melgar, J.C. and Louzada, E.S. 2019. Evaluation of physiological parameters in Citrus plants transformed with cyclic nucleotide gated ion channel (CNGC) gene. Acta Horticulturae 1230: 107-115.
Lawrence B.T. and Melgar, J.C. 2018. Variable fall climate influences nutrient resorption and reserve storage in young peach trees. Frontiers in Plant Science 9: 1819. doi: 10.3389/fpls2018.01819
Lawrence, B. and Melgar, J.C. 2018. Harvest, handling, and storage recommendations for improving postharvest quality of blackberry cultivars. HortTechnology 28: 578-583.
Penella, C., Calatayud, A. and Melgar J.C. 2017. Ascorbic acid alleviates water stress in young peach trees and improves their performance after rewatering. Frontiers in Plant Science, 8: 1627. doi: 10.3389/fpls.2017.01627
Hu, M-J., Peng, C., Melgar, J.C. and Schnabel, G. 2017. Investigation of potential causes of peach skin streaking. Plant Disease 101: 1601-1605.
Nishikawa, F., Louzada, E., Melgar, J.C., Kunta, M. and Setamou, M. 2017. Effects of planting bed height and the use of plastic mesh as ground cover on the flowering of citrus trees. Bulletin of the NARO, Fruit Tree and Tea Science 1: 1-8.
Kusakabe, A., Contreras-Barragan, B.A., Simpson, C.R., Enciso, J.M., Nelson, S.D. and Melgar, J.C. 2016. Application of partial rootzone drying to improve irrigation water use efficiency in grapefruit trees. Agricultural Water Management 178: 66-75.
Contreras-Barragan, B.A., Kusakabe, A., Melgar, J.C. and Nelson, S.D. 2016. Understanding partial rootzone drying in citrus. Acta Horticulturae 1135: 123-130.
Chaudhary, S., Kusakabe, A. and Melgar, J.C. 2016. Phytophthora infection in flooded citrus trees reduces root hydraulic conductance more than under non-flooded condition. Scientia Horticulturae 202: 107-110.
Elsayed-Farag, S. and Melgar, J.C. 2015. Efficiency of tree-based water status indicators at the onset of water deficit in citrus. Horticulture, Environment, and Biotechnology 56: 305-309.
Simpson, C.R., Nelson, S.D., Melgar, J.C., Jifon, J., Schuster, G. and Volder, A. 2015. Effects of salinity on physiological parameters of grafted and ungrafted citrus trees. Scientia Horticulturae 197: 483-489.
Melgar, J.C. 2014. Issues in citrus fruit production. Stewart Postharvest Review 2: 1-4
Romero Conde, A., Kusakabe, A. and Melgar, J.C. 2014. Physiological responses of citrus to partial rootzone drying irrigation strategies. Scientia Horticulturae 169: 234-238.
Melgoza, F.J., Kusakabe, A., Nelson, S.D. and Melgar, J.C. 2014. Exogenous applications of abscisic acid to increase freeze tolerance in citrus trees. International Journal of Fruit Science 14: 376-387.
Simpson, C.R., Nelson, S.D., Melgar, J.C., Jifon, J., King, S.R., Schuster, G. and Volder, A. 2014. Growth response of grafted and ungrafted citrus trees to saline irrigation. Scientia Horticulturae 169: 199-205
Syvertsen, J.P., Albrigo, L.G. and Melgar, J.C. 2012. Mechanical harvesting and citrus tree stress in Florida. Acta Horticulturae 928: 281-286.
Melgar, J.C., Mohamed, Y., Serrano-Castillo, N., GarcÃa-GalavÃs, P.A., Navarro, C., Parra, M.A., BeltrÃ¡n, G., Benlloch, M. and FernÃ¡ndez-Escobar, R. 2012. Response of olive trees to irrigation with saline water. Acta Horticulturae 949: 279-282.
Melgar, J.C., Dunlop, J. and Syvertsen, J.P. 2011. Oleocellosis injury of fruitlets from late season mechanical harvesting of 'Valencia' orange trees does not affect internal fruit quality. HortScience 46: 457-459
Ãlvarez-FernÃ¡ndez, A., Melgar, J.C., AbadÃa, J. and AbadÃa, A. 2011. Fruit quality and yield changes in pear (Pyrus communis L.) and peach (Prunus persica (L.) Batsch) trees as affected by iron deficiency chlorosis. Environmental and Experimental Botany 71: 280-286.
El Jendoubi, H., Melgar, J.C., Ãlvarez-FernÃ¡ndez, A., Sanz, M., AbadÃa, A. and AbadÃa, J. 2011. Setting good practices to assess the efficiency of iron fertilizers. Plant Physiology and Biochemistry 49: 483-488.
Melgar, J.C., Dunlop, J., Albrigo, L.G. and Syvertsen, J.P. 2010. Winter drought stress can delay flowering and avoid immature fruit loss during late-season mechanical harvesting of â€˜Valenciaâ€™ oranges. HortScience 45: 271-276.
Syvertsen, J.P. Melgar, J.C. and GarcÃa-SÃ¡nchez, F. 2010. Salinity tolerance and leaf water use efficiency in Citrus. Journal of the American Society for Horticultural Science 135: 33-39.
Melgar, J.C., Dunlop, J. and Syvertsen, J.P. 2010. Growth and physiological responses of Swingle citrumelo Citrus rootstock seedlings to partial rootzone drying and deficit irrigation. Journal of Agricultural Science 148: 593-602.
Melgar, J.C., Schumann, A.W. and Syvertsen, J.P. 2010. Fertigation frequency affects growth and water and nitrogen use efficiencies of Swingle citrumelo citrus rootstock seedlings. HortScience 45: 1255-1259.
Remorini, D., Melgar, J.C., Guidi, L., Deglâ€™Innocenti, E., Castelli, S., Traversi, M.L., Massai, R. and Tattini, M. 2009. Interaction effects of root-zone salinity and solar irradiance on the physiology and biochemistry of Olea europaea. Environmental and Experimental Botany 65: 210-219.
Melgar, J.C., Mohamed, Y., Serrano, N., GarcÃa-GalavÃs, P.A., Navarro, C., Parra, M.A., Benlloch, M. and FernÃ¡ndez-Escobar, R. 2009. Long term responses of olive trees to salinity. Agricultural Water Management 96: 1105-1113.
Melgar, J.C., Guidi, L., Remorini, D., Agati, G., Deglâ€™innocenti, E., Castelli, S., Baratto, M.C., Faraloni, C. and Tattini, M. 2009. Antioxidant defences and oxidative damage in salt-treated olive plants under contrasting sunlight irradiance. Tree Physiology 29: 1187-1198.
Melgar, J.C., Syvertsen, J.P. and GarcÃa-SÃ¡nchez, F. 2008. Can elevated CO2 improve salt tolerance in olive tree cuttings? Journal of Plant Physiology. 165: 631-640
Melgar, J.C., Syvertsen, J.P., MartÃnez, V. and GarcÃa-SÃ¡nchez, F. 2008. Leaf gas exchange, water relations, nutrient content and growth in citrus and olive seedlings under salinity. Biologia Plantarum. 52: 385-390.
Melgar, J.C., Mohamed, Y., Navarro, C., Parra, M.A., Benlloch, M. and FernÃ¡ndez-Escobar, R. 2008. Long term growth and yield responses of olive trees to different irrigation regimes. Agricultural Water Management 95: 968-972.
Tattini, M., Melgar, J.C. and Traversi, M.L. 2008. Responses of Olea europaea to high salinity: a brief â€“ ecophysiological â€“ review. Advances in Horticultural Science 22: 1-15.
Melgar's lab (español)