EFFECT OF THE SYNTHETIC GROWTH REGULATORS ON GAMMA-IRRADIATION STRESS IN TRITICALE PLANTS

Pot vegetative experiments with triticale, cultivar 7251, were carried out. The plants were grown under controlled conditions and in the phase of stem extension they were irradiated with Cesium-137 gamma rays, at a dose of 4 Gy, and dose intensity of 2 Gy/min. On the day after the irradiation the plants were sprayed with plant growth regulators for the purpose of decreasing the radiation damage. Two types of protectors were tested: Tidiazuron (TDZ) and beta-indolilacetic acid (IAA). The influence of the irradiation and the protective effect of TDZ and IAA on some indices of the productivity in the phase of full ripeness were studied. The coefficient of protection of the applied radiomodifiers was determined as well. In case of irradiation of triticale with a dose of 4 Gy in the phase of stem extension, the reproductive organs were strongly damaged, which led to a considerable reduction of the plant productivity. It was established that TDZ had a weaker effect on the studied indices of productivity. IAA applied after the irradiation, affected positively, to a certain degree, such indices as number of ears, sterility, number and weight of the obtained grains, as a result of which the plant productivity was increased by 25%. The more strongly expressed radioprotective effect of IAA (K-p = 1.53) may allow it to be put into practice when needed.