%0 Article
%T Factors affecting gamma-irradiation sensitivity of Scots pine and Norway spruce
%A Lehtiniemi, Tapio
%D 1977
%J Silva Fennica
%V 11
%N 1
%R doi:10.14214/sf.a14814
%U https://silvafennica.fi/article/4963
%X <p>This study, comprising three experiments, aims to determine the effect of the geographical origin of Scots pine (<em>Pinus sylvestris</em> L.) and Norway spruce (<em>Picea abies (</em>L.) H. Karst.) seeds, and the duration of the time lag between the moisture treatment and subsequent irradiation on the gamma-irradiation sensitivity of seeds.</p>
<p>The studies showed that the greater the irradiation dose seeds were subjected to the slower the rate of germination. In general, small radiation doses (250–1,000 rad) had a stimulating effect and the final germination percentage (36–40 days) increased. However, when the level was further increased, the germination percentage decreased. Air-dry and moistened seeds withstood irradiation better than others. In a study with moistened seeds from different geographical sources, pine and spruce seeds from Northern Finland were less able to withstand irradiation than those originating from the south.</p>
<p>The PDF includes a summary in English.</p>