Author : Sorasak Maneekao; Naruatai Worasatit; Siripong Kumphai; Boonguer Poosri

Summary : Abstract: In 1994, the study of sesame improvement for reduction of seed loss by mutation was conducted at Ubonratchathani Field Crops Research Center (UBFCRC). There were two experiments carried out to improve sesame capsule for non-shattering characteristic using gamma rays and fast neutron. The first experiment was performed to study effect of irradiation rates on sesame when applied with these radiation at the rates varied from 200 to 750 Gy. Results of the experiment showed that all sesame lines had the LD 50 levels between 300-750 Gy when irradiated with gamma rays and 20-80 Gy, with fast neutron. The second experiment was done to investigate the effect of irradiation on shattering types of sesame capsules. Three local varieties, Red Pitsanulok, Black Burirum and white Granuan were irradiated with 500 Gy of gamma rays.