| Abstrakt: |
The surveys were focused on assessing the opportunity for presowing treatment of barley seeds with low-energy electron beam radiation to improve the growth processes and to reduce the damage caused by phytopathogens. The laboratory experiment was carried out to study the impact of low-energy electron beam radiation (160 keV) at doses of 1 kGy, 3 kGy, and 5 kGy and a radiation dose rate of 500 Gy/imp on a range of plant parameters. They included seed germination characteristics and seedling morphometric traits along with the damage caused by fungal diseases at the reference of natural infection, enzyme activities, and phytohormone concentrations in 7-day-old seedlings. The seeds untreated with radiation were used to serve as a control group. Treatment at a dose of 3 kGy induced significant increases in the laboratory germination and the seed growth force by 6 and 10%, respectively, when compared to the control seed group. Irradiation at doses of 1 and 5 kGy did not have any effects on these parameter values. With respect to the doses of 1 and 5 kGy, increases in the lengths of a sprout and a rootlet by 6.8–8.2 and 5.9–24.6%, respectively were recorded, when compared to the control. A dose of 3 kGy had no effect on the values of these parameters. Irradiation had insignificant impacts on seedling's fresh and dry mass and water contents in them. The electron beam radiation treatment of seeds at doses of 1, 3, and 5 kGy completely suppressed the spread of Penicillium spp. Irradiation at 3 and 5 kGy inactivated Fusarium spp. However, the treatment at a dose of 5 kGy is associated with a significant, 2.1-fold increase in the seedling damage caused by Bipolaris sorokiniana and a 1.8-fold increase in its spread. Irradiation had no impact on the activity of most enzymes and phytohormones in seedlings, except the 1.5- and 2.7-fold increases in the contents of indolylacetic and indolylbutyric acids at irradiation at 5 and 1 kGy, respectively, when compared to the control. [ABSTRACT FROM AUTHOR] |
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