The influence of high temperature treatment on seed germination.
The influence of high temperature treatments on the seed germination of several tree and shrub species was studied. High temperature (120°C) treatment significantly increased the germination rates of Vaccinium uliginosum and Spiraea salicifolia, slightly promoted germination of Sorbaria sorbifolia and Alnus sibirica [A. hirsuta var. sibirica], markedly reduced germination of Larix gmelinii, Pinus sylvestris var. mongolica and Betula dahurica [B. davurica], and slightly reduced germination of Betula platyphylla and Alnus japonica. Treatment at lower temperatures gave the following results: 50°C increased germination of Larix gmelinii and Betula platyphylla by 60 and 5.5%, respectively; 70°C increased germination of Pinus sylvestris var. mongolica and Sorbaria sorbifolia by 16.9 and 30.5%, respectively; and 90°C increased germination of Alnus japonica by 88%. Treatment at 120°C increased germination of Vaccinium uliginosum, Spiraea salicifolia and Alnus hirsuta var. sibirica by 434, 58.1 and 15%, respectively.