Abstract
AbstractThe present study focuses on the effects of different kinds of visible light, the intensities of white light, temperature and pH on akinete germination in the green alga Pithophora oedogonia (Mont.) Wittrock. In addition, it was studied how different kinds of visible light applied during akinete formation influenced the subsequent germination in white light. Akinetes initiated to germinate 3 days earlier in blue and green light than in yellow, red and white light. The green light was most favourable to akinete germination, while red light had a poor effect. No photoreversible effect of red and green light was observed. Akinetes formed under green, blue and yellow light germinated quickly and showed a higher percentage of germination than those formed under red light. Germination of akinetes was initiated even when kept in total darkness. Germination of akinetes was favoured in white light at intensities between 0.50 and 1.5 Klux. Maximum germination of akinetes occurred at 25 °C, while progressively higher and lower temperature suppressed germination of akinetes at different levels. Initiation of akinete germination was delayed at a pH of 7 and 8. No germination of akinetes was observed at a pH of 9 and 10.
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