阳光紫外辐射对2种微藻的短期影响

The short-term effect of solar UVR on two microalgae

为了阐明2种赤潮藻柔弱角毛藻(Chaetoceros debilis)和绿色巴夫藻(Pavlova viridis)对阳光紫外辐射(UVR,280～400 nm)变化的响应,比较研究了它们在全波段阳光下和滤除UVR/UV-B条件下的有效光化学效率变化,同时探讨了室内无UVR的低光条件下其有效光化学效率的恢复。结果表明,阳光UVR抑制藻细胞的有效光化学效率,其抑制程度随着接受辐射处理时间的延长而增大,在10 min左右细胞内的修复与损伤速率达到平衡,抑制率不变,且阳光UVR对二种藻的抑制程度相差不大。转移到无UVR的弱光条件下,藻细胞的有效光化学效率得到恢复,但恢复过程中柔弱角毛藻恢复明显快于绿色巴夫藻,体现了不同藻细胞对阳光UVR响应的种间差异。

In order to study the effects of solar UV radiation（280-400 nm） on microalgae,the effective quantum yield of Chaetoceros debilis and Pavlova viridis,were examined under full spectrum solar radiation and that screened off UVR.It was found that solar UVR suppressed the effective quantum yield in both species,and the inhibited effective quantum yield recovered under UVR-free dim light.The UVR-induced damage and the following repair rate were similar for both of microalga.However,the recovery of effective quantum yield for C.debilis was faster than that for P.viridis,indicating a significant difference between the species in photochemical responses to solar UVR.