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*Corresponding author: Peeranuch Jompuk, Department of Applied Radiation and Isotopes, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand. E-mail: fsciprk@ku.ac.th Received: 11 February 2019; Accepted: 24 April 2019 INTRODUCTION Curcuma alismatifolia is a tropical flower that can be found in northern and north-eastern Thailand. C. alismatifolia is a species of plant in the family Zingiberaceae, genus Curcuma (Department of Agricultural Extension, 2005). A common name is Siam Tulip because they have beautiful leaves and flowers similar to the leaves and flowers of the European tulip. C. alismatifolia can be used as cut flowers, potted plants or ornamental plants in beds (National Research Council of Thailand, 2012), which has made them popular in Thailand and other countries. Thailand exports C. alismatifolia in the form of undeveloped rhizomes, rhizomes that are growing already, and fresh flowers. Annual export value is 3-6 hundred thousand dollars (Department of Agriculture, 2018). Improvement of C. alismatifolia is being worked on continuously to respond to the market demand, by selecting from the genes in nature or through the development of varieties by interspecific hybridization, such as the Curcuma hybrid ‘Laddawan’ of Dynamic Seeds Co., Ltd. It is a hybrid between C. alismatifolia and C. petiolata. There is a distinctive inflorescence with pink and purple flowers that can be used as cut flowers and potted plants (Fig. 1(A)) (National Research Council of Thailand, 2012). The offspring display traits and characteristics of both parents, but are often sterile, preventing gene flow between the species. Then they cannot interbreed with the parental species. Mutation breeding is a way to induce genetic mutations in plants by using x-rays, gamma-rays, ion beams, laser beams, neutrons and electron beams, which may result in gene mutation and R E S E A R C H A R T I C L E

emirates journal of food and agriculture

Comparative effect of high energy electron beam and 137Cs gamma ray on survival, growth and chlorophyll content in curcuma hybrid ‘Laddawan’ and determine proper dose for mutations breeding