Journal
JOURNAL OF APPLIED PHYCOLOGY
Volume 26, Issue 4, Pages 1669-1674Publisher
SPRINGER
DOI: 10.1007/s10811-013-0225-y
Keywords
UV-B radiation; Interactive effect; Microcystis; Cyanobacteria; Nutrient limitation
Funding
- National Natural Science Foundation of China [31200296, 31200353]
- 135 key point overall project of Nanjing Institute of Geography and Limnology, CAS [NIGLAS2012135010]
- CAS International Partnership Creative Group [KZZD-EW-TZ-08-01]
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In this study, Microcystis aeruginosa was cultivated in a P-limited and P-replete culture medium and exposed to artificial UV-B radiation to investigate the interactive effect of UV-B exposure and phosphorus limitation on this harmful alga. After 15 days, both UV-B exposure and phosphorus limitation led to a significant decline in pigment content (phycocyanin and carotene) and photosynthetic activity (F (v)/F (m) and ETRmax), and the impact was most pronounced when the two conditions were combined. Due to the interactive effect, P-limited M. aeruginosa under UV-B exposure exhibited the lowest cell density compared to the other treatments. These results suggest that phosphorus limitation increases the stress of UV-B radiation in Microcystis. In other words, high-level UV-B radiation has higher growth inhibitory on Microcystis in P-limited lakes than in P-replete lakes.
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