Control of In Vitro Contamination in Dionysia tapetodes for Effective Micropropagation

Document Type: Original Article


1 Department of Ornamental Plants, Research Center for Plant Sciences, Ferdowsi University of Mashhad, Mashhad, Iran

2 PhD Student, Department of Horticultural Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran

3 Assistant Professor, Department of Legume Research, Research Center for Plant Sciences, Ferdowsi University of Mashhad, Mashhad Iran


In vitro microbial contaminations are the most serious problems in plant tissue culture. Initial attempts for micropropagation of Dionysia tapetodes, a beautiful alpine cushion plant from north-east Iran, led to 100% explants contamination. Hence, the present study was conducted to develop an efficient surface sterilization protocol for in vitro culture of field collected D. tapetodes using combinations of different disinfection agents including sodium hypochlorite (NaOCl), ethanol and mercuric chloride (HgCl2) in different concentrations and exposure times. The most effective sterilization treatment with 91.6% healthy explants was the application of 0.1% mercuric chloride for 4 min. However, mercuric chloride in higher concentration (0.2%) was toxic to explants tissues and resulted in 41.66% necrosis. Moreover, the results indicated that in spite of being a general disinfectant in tissue culture studies, NaOCl was not as effective as mercuric chloride in elimination of microbial contaminations and led to 75% total infection when used in concentration of 3% for 15 min. The current experiment represented a potential method for disinfection of D. tapetodes and provided aseptic and clean explants for future in vitro culture studies.


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