Effects of Solar Radiation on Photoorientation, Motility and Pigmentation in a Freshwater  Cryptomonas | Zendy

Häder D.P. | Zendy; Häder Maria | Zendy

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Effects of Solar Radiation on Photoorientation, Motility and Pigmentation in a Freshwater Cryptomonas

Author(s) -

Häder D.P.,

Häder Maria

Publication year - 1989

Publication title -

botanica acta

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.871

H-Index - 87

eISSN - 1438-8677

pISSN - 0932-8629

DOI - 10.1111/j.1438-8677.1989.tb00099.x

Subject(s) - radiation , motility , irradiation , population , sunlight , pigment , botany , photosynthesis , biology , chemistry , optics , physics , medicine , microbiology and biotechnology , environmental health , organic chemistry , nuclear physics

The effects of solar radiation on motility, photoorientation and pigmentation have been studied in a freshwater Cryptomonas species. The diaphototactic orientation performed by the cells is impaired within about 90 min of solar radiation. Likewise, the percentage of motile cells within the population and the average velocity of the swimming cells decreases within about the same exposure time. This effect is not due to a thermal stress but rather seems to be caused by the solar UV‐B component, since decreasing short wavelength UV radiation by means of an artificial ozone filter or UV cut‐off filters increased the tolerated exposure time. Solar radiation also bleached the photosynthetic pigments of the cells as shown by absorption difference spectra.

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