Vieira D C M, Socolowski F, Takaki M
Departamento de Botânica, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP, Brazil.
Braz J Biol. 2010 Nov;70(4):1015-20. doi: 10.1590/s1519-69842010000500014.
The aims of this study were to evaluate the effects of light and temperature on seed germination and the effect of light on seedling emergence of Clausena excavata, an invasive exotic species. Seeds were incubated at constant temperatures (10 to 40 ºC), under continuous white light and darkness. Seedling emergence was evaluated under full sun and canopy shade. There was no significant difference between seeds germinated in the presence or absence of light at temperatures between 20 and 35 ºC. Seeds maintained at 20 ºC germinated more slowly than other temperatures. Independent of temperature, seed germination was much more synchronised under white light than under darkness. In the field, emergence occurred in both environments, but a greater percentage was observed under full sun. Seedling emergence occurred at the same rate and synchronisation index under both conditions. C. excavata has a high invader potential in open areas and shaded environments.
本研究的目的是评估光照和温度对外来入侵物种假黄皮种子萌发的影响以及光照对其幼苗出土的影响。将种子在恒定温度（10至40摄氏度）下、持续白光和黑暗条件下进行培养。在全日照和树冠遮荫条件下评估幼苗出土情况。在20至35摄氏度之间，有光或无光条件下萌发的种子之间没有显著差异。保持在20摄氏度的种子比其他温度下萌发得更慢。与温度无关，白光下种子萌发比黑暗中更同步。在田间，两种环境下均有幼苗出土，但全日照下观察到的比例更高。两种条件下幼苗出土的速率和同步指数相同。假黄皮在开阔区域和遮荫环境中具有较高的入侵潜力。
