Effects of light and temperature on seed germination in Cecropia hololeuca Miq. (Cecropiaceae)

Brazilian Archives of Biology and Technology

关键词: Cecropia hololeuca;    germination;    alternating temperature;    phytochrome;    light;   

DOI  :  10.1590/S1516-89132004000200004

来源: DOAJ

【 摘 要 】

Seeds of Cecropia hololeuca were submitted to regimes of constant and alternating temperatures, associated with photoperiods of white light, "shade light" and continuous darkness under controlled conditions in laboratory. Seeds did not germinate at constant temperatures of 10°C to 20°C and above 35°C. Seeds only germinated in the darkness when the temperature was alternated. "Shade light" inhibited germination. We concluded that the regime of alternating temperatures suppressed the light effects on seed germination of this species.
Sementes de Cecropia hololeuca foram submetidas a regimes de temperaturas constantes e alternadas, associadas a fotoperíodos com luz branca, "luz de sombreamento" e escuro contínuo sob condições controlados em laboratório. Temperaturas constantes de 10°C a 20°C e acima de 35°C, não promoveram a germinação. As sementes germinaram no escuro quando a temperatura foi alternada, e a "luz de sombreamento" a germinação. Concluímos que o regime de temperaturas alternadas suprimiu os efeitos da luz sobre a germinação.

【 授权许可】

Unknown