Escuela de Biología, Universidad Central de Venezuela, Caracas, Venezuela.
Planta. 1976 Jan;128(3):195-9. doi: 10.1007/BF00393228.
The germination response of seeds of Ludwigia octovalvis (Jacq.) (=Jussiaea suffruticosa L.; Raven, 1963), to continuous light and to various types of intermittent irradiations is determined at 25, 30, 35 and 40° at different light intensities. At 25 and 40° intermittent irradiations are an effective substitute for continuous ones, while at 30 and 35° no promotion of germination is observed in the intermittent irradiations tested, except if the dark interval between light pulses is reduced to 1 min. Previous results obtained in the photocontrol of germination in this species are confirmed and extended to a variety of light cycles and intensities, indicating that the response to temperature is bimodal unless light is supplied continuously with high intensity, and that germination depends on light intensity more markedly in the temperature region of minimum germination (30-35°). As germination in this species is controlled by the red far-red system, hypothesis to account for the temperature dependence are based on the interaction between temperature and the reactions in which phytochrome is involved.
在 25、30、35 和 40°C 的不同光照强度下，研究了八角莲（Ludwigia octovalvis（Jacq.）= Jussiaea suffruticosa L.；Raven，1963）种子对连续光照和各种间歇辐射的萌发反应。在 25 和 40°C 时，间歇辐射是连续辐射的有效替代品，而在 30 和 35°C 时，在测试的间歇辐射中没有观察到萌发的促进作用，除非光脉冲之间的暗间隔缩短到 1 分钟。在该物种中，对萌发的光控作用获得的先前结果得到了证实，并扩展到各种光照周期和强度，表明除非以高强度连续提供光，否则对温度的反应是双峰的，并且在萌发的最低温度区域（30-35°C），萌发对光强度的依赖性更为明显。由于该物种的萌发受红远红光系统控制，因此解释温度依赖性的假设基于温度与涉及光敏色素的反应之间的相互作用。
