Increasing Temperature Counteracts the Negative Effect of UV Radiation on Growth and Photosynthetic Efficiency of Microcystis aeruginosa and Raphidiopsis raciborskii,Photochemistry and Photobiology

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Increasing Temperature Counteracts the Negative Effect of UV Radiation on Growth and Photosynthetic Efficiency of Microcystis aeruginosa and Raphidiopsis raciborskii
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2021-01-04 , DOI: 10.1111/php.13377
Natália Pessoa Noyma ₁ , Marcella C B Mesquita ₁ , Fábio Roland ₂ , Marcelo Manzi Marinho ₁ , Vera L M Huszar ₃ , Miquel Lürling ₄

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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°C and 28°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°C when compared to that at 28°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.

中文翻译：

升高温度抵消了紫外线辐射对铜绿微囊藻和 Raphidiopsis raciborskii 生长和光合效率的负面影响

高温可以促进蓝藻大量繁殖，而紫外线辐射 (UVR) 可能会通过破坏蓝藻的光合作用装置来抑制蓝藻的生长。尽管 UVR 的破坏性影响已得到充分证明，但关于紫外线辐射暴露和变暖对蓝藻的交互影响的报道仍然很少。为了更好地了解温度和 UVR 对蓝藻的综合影响，两种有害物种，铜绿微囊藻(MIRF) 和Raphidiopsis raciborskii（以前称为Cylindrospermopsis raciborskii，CYRF)，在 24°C 和 28°C 下生长，每天暴露于 UVA + UVB (PAR + UVA+UVB) 或仅 UVA (PAR + UVA) 辐射。MIRF 和 CYRF 生长速率受 PAR + UVA+UVB 处理的影响最大，而受 PAR + UVA 处理的影响较小。与 28°C 相比，24°C 时 UVR 对生长、光系统 II (PSII) 效率和光合作用的负面影响明显。我们的结果显示了对 MIRF 中 PSII 效率的累积负面影响，但在 CYRF 中没有。因此，尽管较高的温度可以改善 UVR 损伤，但种间差异可能会导致对不同物种的影响产生偏差，并且高温和 UVR 胁迫的结合可能会影响物种竞争。

更新日期：2021-01-04

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