In order to study the radiosensitivity in three varieties of Sudan grass (Sorghum sudanense (Piper.) Stapf.) of different origin - Kazitachi (Japan), Vercors (USA) and Voronezskaya 9 (Russia) dry seeds were irradiated with ten doses of gamma rays (Cs 137) - 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800 and 2000 Gy. It was found that gamma rays did not have a statistically significant effect on the laboratory germination (variation from 89.36% to 101.06% compared to the control treatments) which did not allow the determination of the LD50 under laboratory conditions. Negative correlations were established in the rate of growth and accumulation of fresh biomass, the index of development of plants (GI) depending on the doses of gamma rays applied.
Radiosensitivity in Sudangrass (Sorghum sudanense (Piper.) Stapf.) 1. Experiments under laboratory conditions