PHYSIOLOGICAL EFFECTS OF THE SYNTHETIC GROWTH REGULATOR THIDIAZUROL (DROP) ON GAMMA-IRRADIATED STRESS IN PEAS PLANTS (PISSUM SATIVUM L.)

2002, 3 (4)   p. 293-300

N STOEVA

Abstract

Young plants, obtained from the control and gamma-irradiated seeds, were studied in laboratory experiments. The possible protective effect of the synthetic growth regulator Drop, applied after the stress, was studied. The seeds were irradiated with 80 and 100 Gy Co60 and germinated in 5.10-4 M water solution of Drop. 30- day-old plants , obtained from the control, gamma-irradiated and treated seeds, were studied . Biometric parameters, leaf gas-exchange and plastid pigments contents were measured. Under stress conditions, the growth rates of the γ-ray-treated seeds indicated negative effect in plants, recorded by the decrease of the height, fresh and dry masses, in comparison with the control. It was established that +Drop had a modifying effect on gamma-irradiation, which effect was expressed in the growth and in the leaf gas-exchange of the 30-day-old plants.

Keywords

gamma-irradiation stress, synthetic growth regulator, growth, photosynthetic pigments

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