Efects of light, temperature, growth substances and potassium on the germination of <I>Miconia cinnamomifolia</I> (DC) Naudin

Abstract

Germination is higher in larger and heavier seeds. The seed is light sensitive, and in a range of 1 to 12 hours of light. The germination is strongly related to the increasing light period Red, far red and blue light are able to promote germination, red light being the most effective. In a range of temperatures between 15°C and 35°C, germination is higher at 25° C and 30°C, being completly inhibited at 15°C and 35°C. Germination at alternating temperatures of 25°C-15°C, 25°C-30°C and 25°C-35°C is similar to germination occured at constant temperature of l5°C, 20°C, 30°C and 35°C. Application of gibberellic acid (GA3) lO-3M, indolacetic acid (IAA) lO-3M and indolbutiryc acid (IAB) lO-3M inhibit germination. 240ppm ethylene, kinetin lO-3M and 1% potassium nitrate don't affect ermination.