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Influence of UV-B radiation and nitrogen starvation on daily rhythms of phototaxis and cell shape in Euglena gracilis
Section of Plant Physiology, Lund University.
Section of Plant Physiology, Lund University.ORCID iD: 0000-0003-2835-097X
Section of Plant Physiology, Lund University.
1994 (English)In: Physiologia Plantarum, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 92, p. 501-505Article in journal (Refereed) Published
Abstract [en]

The flagellate Euglena gracilis Klebs strain Z shows phototaxis and changes cell shape between oblong and round. Both cell events show daily rhythmicity. Phototaxis was highest about 2 h after light onset with a second peak of activity 9 h later. At the same times, the cells were in their most oblong shape. During the night phase the cells were phototactically inactive and round. These rhythms were altered by environmental stress, e.g. UV‐B radiation (280–320 nm) and nitrogen deficiency. Artificial UV‐B radiation of 0.5 W m−2 caused a loss in phototaxis hut the peak of activity occurred at the same time as for control cells. The transition from round to oblong cell shape was slower after UV‐B radiation, but the difference between the roundest and the most oblong cell shape was unchanged. Nitrogen deficiency caused a total loss of phototaxis and the cells remained round all the time. The cells lost all their chlorophyll and were, therefore, photosynthetically inactive.

Place, publisher, year, edition, pages
1994. Vol. 92, p. 501-505
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Natural Sciences
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URN: urn:nbn:se:mau:diva-37498DOI: 10.1111/j.1399-3054.1994.tb08842.xOAI: oai:DiVA.org:mau-37498DiVA, id: diva2:1508451
Available from: 2020-12-10 Created: 2020-12-10 Last updated: 2022-05-10Bibliographically approved

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