Open Access Research Paper Views (686) Drought stress response in caucasian hackberry: growth and morphology Sayed Abdolhossein Tabatabaei, Hamid Jalilvand, Hamid Ahani J. Biodiv. & Environ. Sci. 5(3), 158-169, September 2014. Keywords: Celtis Caucasica, Nursery irrigation, Principal components analysis, Repeated measures, Seedling Details