ЕФЕКТ НА ТИДИАЗУРОНА И ДИЕТИЛЕНТРИАМИНА ПРИ ГАМА-ОБЛЪЧЕНИ РАСТЕНИЯ ОВЕС И ТРИТИКАЛЕ

The potential modifying effect of the synthetic growth regulators Tidiazuron and poliamine diethilentriamine, applied after gamma-irradiation stress on oats and triticale plants, was studied. Pot vegetative experiments with spring oats, cultivar Hanza 152, and 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 rate of 6 Gy (oats), and 4 Gy (triticale), and dose intensity of 2 Gy/min. On the day after the irradiation the plants were sprayed with a radioprotector for the purpose of decreasing the radiation damage. Two types of protectors were tested: tidiazuron and diethilenthriamine. The irradiation of oats and triticale plants in the phase of stem extension caused stress, which was detected by the disorganization of the cardinal physiological processes. The tested synthetic plant growth regulators reduced the negative effect of the irradiation. The peroxidase activity and the lipid peroxidation were reduced, while the plant productivity and the photosynthetic pigments were increased, both photosynthesis and transpiration activation were increased. Independently of the similar effect of both of the substances, polyamine DETA was characterized with a better modifying effect.Изследван беше модифициращият ефект на синтетичния растежен регулатор Тидиазурон и полиамина Диетилентриамин. Изведен беше вегетационен съдов опит с пролетен овес, сорт Ханза и тритикале сорт 7251. Растенията бяха отгледани при контролирани условия и във фаза вретенене бяха облъчени с гама-лъчи (Cs- 137), доза 6 Gy (овес), и 4 Gy (тритикале), при мощност на дозата 2 Gy/min. На следващия ден бяха третирани с посочените растежни вещества. Установено беше, че облъчването на овес и тритикале предизвиква стрес в растенията, който се изразява в подтискане на физиологичните процеси. Приложените вещества намаляват негативния ефект от облъчването. Липидната пероксидация и активността на ензима пероксидаза намаляват, докато продуктивността, скоростта на фотосинтезата и съдържанието на фотосинтетичните пигменти се повишава при третираните растения. Независимо от сходния характер на веществата, полиаминът диетилентриамин се характеризира с по-добър модифициращ ефект

EFFECT OF TIDIAZURON AND DIETHILENTRIAMINE ON GAMMA-IRRADIATED OATS AND TRITICALE PLANTS

The potential modifying effect of the synthetic growth regulators Tidiazuron and poliamine diethilentriamine, applied after gamma-irradiation stress on oats and triticale plants, was studied. Pot vegetative experiments with spring oats, cultivar Hanza 152, and 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 rate of 6 Gy (oats), and 4 Gy (triticale), and dose intensity of 2 Gy/min. On the day after the irradiation the plants were sprayed with a radioprotector for the purpose of decreasing the radiation damage. Two types of protectors were tested: tidiazuron and diethilenthriamine. The irradiation of oats and triticale plants in the phase of stem extension caused stress, which was detected by the disorganization of the cardinal physiological processes. The tested synthetic plant growth regulators reduced the negative effect of the irradiation. The peroxidase activity and the lipid peroxidation were reduced, while the plant productivity and the photosynthetic pigments were increased, both photosynthesis and transpiration activation were increased. Independently of the similar effect of both of the substances, polyamine DETA was characterized with a better modifying effect