Spiral breakage and photoinhibition of Arthrospira platensis (Cyanophyta) caused by accumulation of reactive oxygen species under solar radiation

文献类型: 外文期刊

第一作者: Ma, Zengling

作者: Ma, Zengling;Gao, Kunshan;Ma, Zengling

作者机构:

关键词: Arthrospira platensis;Catalase (CAT);Chlorophyll fluorescence;Morphology;Reactive oxygen species (ROS);Superoxide dismutase (SOD)

期刊名称:ENVIRONMENTAL AND EXPERIMENTAL BOTANY ( 影响因子:5.545; 五年影响因子:5.99 )

ISSN: 0098-8472

年卷期: 2010 年 68 卷 2 期

页码:

收录情况: SCI

摘要: Previous studies showed that exposure of Arthrospira spp. spirals to natural levels of solar radiation in the presence of UV radiation (UVR, 280-400 nm) led to the breakage of its spiral structure. However, the underlying mechanisms have not yet been explored. Here, we showed that associated accumulation of reactive oxygen species (ROS) resulted in the spiral breakage by oxidizing the lipids of sheath or cell membrane in Arthospira platensis, and presence of UVR brought about higher accumulation level of the ROS. Activities of superoxide dismutase (SOD) and catalase (CAT) were inhibited by high levels of solar PAR, addition of UVR led to further inhibition of CAT activity. High levels of ROS also decreased the content of photosynthetic pigments, damaged photosystem 11 (PSII) and inhibited the photosynthesis and growth. It is concluded that both UV and high PAR levels could generate higher amounts of ROS, which decreased the photosynthetic performances and led to spiral breakage of A. platensis. (C) 2009 Elsevier B.V. All rights reserved.

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