Wpływ różnych dawek promieni gamma 60Co na dynamikę kiełkowania nasion i przeżywalność siewek asra chińskiego (Callistephus chinensis Nees). Cz. I [The effect of varying doses of gamma rays 60Co on the dynamics of seed germination and survival of China aster (Callistephus chinensis Nees) seedlings]

Abstract

Studies were undertaken on the effect of gamma rays on germination of aster seeds in laboratory conditions and in a greenhouse, as well as on the dynamics of seedling survival after 10, 20, 30 and 40 days. In laboratory conditions negative effect of radiation on seed germination was noted already four days after sowing. However, this effect was only transitory and after 10 days decreased germination ability was observed only in case of 'Goplana' variety, at radiation doses of 24 and 30 kR. In greenhouse conditions higher radiation doses decreased germination ability of most varieties under study and prolonged germination time. At 24-50 kR inhibition of growth and development of seedlings – at the stage of cotyledon - was noted in all varieties under study. Lethal effect of radiation occurred after 20 or 30 days and increased with time. Level of LD₁₀₀ after 40 days varied in particular varieties from 12 to 18 kF. Reaction of particular varieties under study was also diffenetiated.