Hassan Salehi was born in Ray, Iran in 1968. He graduated in Horticultural Sciences, B.S. in 1991, M.S. in 1995, and Ph.D. in 2005. He had employed by Shiraz University as an instructor (1995), Assistant Professor (2005), Associate Professor (2009), and Professor (2013). He engaged two international labs in US including Michigan State University (2003-2004) and University of California (2012-2013). He is the editor of 4 international journals, and reviewer of many refereed journals. His area of interest for research and teaching is turfgrass’ and ornamental plants’ physiology and biotechnology. He awarded Distinguished Researcher of Shiraz University (2014), Distinguished Chairperson of Shiraz University (2012), Distinguished Associate Professor of Shiraz University (2010), and Distinguished Lecturer of Department of Horticultural Science (2003). He has published more than 80 papers in refereed journals and more than 120 conference papers.
In this study, one foreign cultivar and forty-nine common bermudagrass accessions were collected from 18 provinces of Iran. The experiment was conducted with four temperature regimes (24/17, 7.5/0, -7.5/-12 and -15/-15°C day/night cycles) in a factorial experiment based on the completely randomized design with three replications. Differences among treatment means were assessed by the Least Significant Difference (LSD) test at P = 0.05 probability level. Physiological characters were assessed in order to classify accessions as either cold -tolerant or -sensitive using Ward’s method of Hierarchical cluster analysis in SPSS software. Our results revealed that cold-tolerant common bermudagrass accessions showed higher proline, protein, antioxidant enzymes, color, visual quality and chlorophyll content and cold-sensitive accessions showed more severe cell membrane damage (EL) under cold stress conditions. Fall in temperature from 24°C severely decreased chlorophyll content, visual quality and color in all accessions. The highest antioxidant enzymes activity, chlorophyll content, color and visual quality at -7.5°C were observed in Taft, foreign cultivar, Naein, Malayear, Aligoudarz, Safashahr and Gorgan accessions. The increase in POD, SOD, CAT and APX activity observed in this study is assumed to protect cells from oxidative damage caused by cold stress. The most cold-tolerant accessions at -15°C were Taft, Naein and Malayear. Significant variations in freezing tolerance were observed between Iranian accessions of common bermudagrass. Further molecular studies are needed to clarify better these findings.