One of the breeding strategies for orchids is through induced mutation in which orchid plants or cells are exposed to mutagens such as gamma rays, x-rays, electrons or ion beams or chemical agents [10]. Among the targeted breeding traits for orchid mutants are flower color, sizes, morphology and shelf life as well as plant architecture and vigor. Although several new mutant varieties have been developed in ornamental plants using gamma radiation and are propagated for new traits [11–13], only few mutant varieties of D. sonia have been successfully generated through mutagenesis namely ‘Keena Oval’, ‘Ahmad Sobri’, ‘Keena radiant’ and ‘Hieng Ding