Fluorescence characteristics of cyanobacteria (blue-green algae) |
| |
Authors: | Schubert Hendrik; Schiewer Ulrich; Tschirner Erhard |
| |
Institution: | Sektion Biologie der Wilhelm-Pieck-Universität Rostock Freiligrathstrasse 718, Rostock, DDR-2500
1Ingenieurhochschule Köthen Wissenschaftsbereich Verfahrenstechnik, Köthen, DDR-4370, GDR |
| |
Abstract: | The fluorescence characteristics of the cyanobacteria Synechocystisaquatilis Sauv., Microcystis firma (Breb. et Lenorm.) Schmidleand Synechococcus leopoliensis (Racib.) Kom. and the green algaScenedesmus quadricauda (Turp.) Breb. were examined. In thethree cyanobacteria, phycocyanin is the main accessory pigment.Phycoerythrin is not present in our investigated strains ofcyanobacteria. The highest excitation of the chlorophyll a (Chla) fluorescence of cyanobacteria resulted from light with wavelengthsof 620630 nm. A definite Kautsky effectis also evident at this wavelength. However, excitation withblue light (420520 nm) produced only very slight fluorescence.The Kautsky effect is not evident at these wavelengths, evenat high photon flux densities. For Scenedesmus, fluorescencecharacteristics typical of green algae were found. The fluorescenceexcitation of cyanobacteria at 620 nm corresponds to a photosynthesispeak in the action spectrum measured in terms of O2 production.The results underline the necessity of fluorescence measurementsat several wavelengths whenever mixed populations are involved.Such measurements also present possibilities for more accurateestimation of biomass and potential photosynthetic productionin mixed populations. |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|