Effect of external factors on phototaxis of Chlamydomonas reinhardtii
- 1 January 1977
- journal article
- research article
- Published by Springer Nature in Archiv für Mikrobiologie
- Vol. 112 (2) , 179-185
- https://doi.org/10.1007/bf00429333
Abstract
The effects of carbon dioxide, oxygen and pH on the inversion intensity of phototaxis of Chlamydomonas reinhardtii have been investigated. With decreasing CO2 tension the inversion intensity is decreased. The gassing with CO2 can be substituted by hydrogencarbonate only to a small extent (20%). On the other hand, the effect of decreasing CO2 tension can be prevented also only in part by adjusting the pH to about 6.5–7.0. Thus the effect of CO2 on the inversion intensity of phototaxis is obviously a compostite of a true CO2 effect and an effect of the concomitant pH change. Oxygen has only a slight effect. In presence of oxygen (air) the phototactic reaction values are somewhat lower than in its absence. Under certain conditions circadian rhythms seem to be initiated by changing oxygen as well as CO2 tensions. Based on these results some contradictory results of older investigations are discussed.Keywords
This publication has 6 references indexed in Scilit:
- Effect of external factors on phototaxis of Chlamydomonas reinhardtiiArchiv für Mikrobiologie, 1975
- The Relationship between Stimulus Intensity and Oriented Phototactic Response (Topotaxis) in ChlamydomonasPhysiologia Plantarum, 1971
- Phototactic investigations in Chlamydomonas reinhardii dangeard in homocontinuous cultureArchiv für Mikrobiologie, 1971
- Factors Affecting Light Response in Phototactic AlgaePhysiologia Plantarum, 1959
- Reversion in the sense of orientation to light in the colonial forms, Volvox globator and Pandorina morumJournal of Experimental Zoology, 1919
- Ueber die Erregung von positivem Heliotropismus durch Säure, insbesondere Kohlensäure, und von negativem Heliotropismus durch ultraviolette StrahlenPflügers Archiv - European Journal of Physiology, 1906