期刊
PHOTOCHEMISTRY AND PHOTOBIOLOGY
卷 97, 期 4, 页码 753-762出版社
WILEY
DOI: 10.1111/php.13377
关键词
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资金
- CAPES (Brazil)/NUFFIC (The Netherlands) project [045/12]
- CAPES
- WIMEK research fellowship grant - Wageningen University & Research Center
- National Council for Scientific and Technological Development, Brazil, CNPq [303572/2017-5, 304284/2017-3]
Research on the interactive effects of high temperature and UVR on cyanobacteria is limited. Different species of cyanobacteria show varying responses to UVR at different temperatures, with MIRF showing a cumulative negative effect on PSII efficiency while CYRF does not. The combined elevated temperature and UVR stress could potentially influence species competition.
High temperature can promote cyanobacterial blooms, whereas ultraviolet radiation (UVR) can potentially depress cyanobacterial growth by damaging their photosynthetic apparatus. Although the damaging effect of UVR has been well documented, reports on the interactive effects of UV radiation exposure and warming on cyanobacteria remain scarce. To better understand the combined effects of temperature and UVR on cyanobacteria, two strains of nuisance species, Microcystis aeruginosa (MIRF) and Raphidiopsis raciborskii (formerly Cylindrospermopsis raciborskii, CYRF), were grown at 24 degrees C and 28 degrees C and were daily exposed to UVA + UVB (PAR + UVA+UVB) or only UVA (PAR + UVA) radiation. MIRF and CYRF growth rates were most affected by PAR + UVA+UVB treatment and to a lesser extent by the PAR + UVA treatment. Negative UVR effects on growth, Photosystem II (PSII) efficiency and photosynthesis were pronounced at 24 degrees C when compared to that at 28 degrees C. Our results showed a cumulative negative effect on PSII efficiency in MIRF, but not in CYRF. Hence, although higher temperature ameliorates UVR damage, interspecific differences may lead to deviating impacts on different species, and combined elevated temperature and UVR stress could influence species competition.
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