The Sensitivity of Leersia hexandra Sw. to Gamma-Ray Irradiation

Gamma-ray irradiation as a physical mutagen has high penetrating power. Therefore, it is most often used to increase genetic variability or produce new mutant plants. This research was conducted obtain the lethal dose of gamma-rays in Leersia hexandra The plant part single node stolon which had length 10 cm with middle stolon. doses given were 0, 25, 50, 75, 100 Gy. Stolons inserted into plastic clips and irradiated using Cobalt-60 gamma source at Center for Irradiation Radioisotope Applications (PAIR), National Nuclear Energy Agency (BATAN) Jakarta. Gamma-irradiation significant effect on inhibiting shoot growth. growth best number plants highest shoots obtained 25 Gy decreased increasing dose. (LD 50 ) determined eight days after CurveExpert 1.4 software. that can sprout regenerate followed linear equation y = 1.02 - 7.5x LD 68.85 20 29.36 Keywords: irradiation, variation, , dose, plant.