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INTERACTIONS BETWEEN UV‐B EXPOSURE AND PHOSPHORUS NUTRITION. I. EFFECTS ON GROWTH, PHOSPHATE UPTAKE, AND CHLOROPHYLL FLUORESCENCE 1
Author(s) -
Shelly Kirsten,
Roberts Simon,
Heraud Philip,
Beardall John
Publication year - 2005
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2005.00148.x
Subject(s) - biology , fluorescence , phosphate , nutrient , growth rate , phosphorus , chlorophyll fluorescence , quantum yield , biophysics , algae , chlorophyll a , ultraviolet , botany , chlorophyll , photochemistry , food science , biochemistry , ecology , materials science , chemistry , optics , physics , geometry , mathematics , optoelectronics , metallurgy
The interactive effects of P starvation and exposure to UV radiation on growth rates, quantum efficiency of PSII electron transport, and P‐uptake capacity of the chlorophyte microalga Dunaliella tertiolecta Butcher are presented. Ultraviolet radiation did not in itself cause marked changes in growth rate, though it did induce changes in the effective quantum yield of PSII. Depriving cells of phosphate resulted in significant changes in all parameters examined. The decline of growth rate and fluorescence parameters after P starvation was significantly faster in the presence of UV radiation. Ultraviolet radiation also stimulated the magnitude of the transient changes in chl fluorescence (nutrient‐induced fluorescence transient) exhibited by P‐starved cells after resupply of that nutrient.