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题名: Ca2+-regulated cyclic electron flow supplies ATP for nitrogen starvation-induced lipid biosynthesis in green alga
作者: Chen, Hui1; Hu, Jinlu1, 2; Qiao, Yaqin1, 2; Chen, Weixian1, 2; Rong, Junfeng3; Zhang, Yunming1, 2; He, Chenliu1; Wang, Qiang1
刊名: SCIENTIFIC REPORTS
发表日期: 2015-10-09
DOI: 10.1038/srep15117
卷: 5
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
英文摘要: We previously showed that both the linear photosynthetic electron transportation rate and the respiration rate dropped significantly during N starvation-induced neutral lipid accumulation in an oil-producing microalga, Chlorella sorokiniana, and proposed a possible role for cyclic electron flow (CEF) in ATP supply. In this study, we further exploited this hypothesis in both Chlorella sorokiniana C3 and the model green alga Chlamydomonas. We found that both the rate of CEF around photosystem I and the activity of thylakoid membrane-located ATP synthetase increased significantly during N starvation to drive ATP production. Furthermore, we demonstrated that the Chlamydomonas mutant pgrl1, which is deficient in PGRL1-mediated CEF, accumulated less neutral lipids and had reduced rates of CEF under N starvation. Further analysis revealed that Ca2+ signaling regulates N starvation-induced neutral lipid biosynthesis in Chlamydomonas by increasing calmodulin activity and boosting the expression of the calcium sensor protein that regulates Pgrl1-mediated CEF. Thus, Ca2+-regulated CEF supplies ATP for N starvation-induced lipid biosynthesis in green alga. The increased CEF may re-equilibrate the ATP/NADPH balance and recycle excess light energy in photosystems to prevent photooxidative damage, suggesting Ca2+-regulated CEF also played a key role in protecting and sustaining photosystems.
关键词[WOS]: CHLORELLA SP C2 ; CHLAMYDOMONAS-REINHARDTII ; PHOTOSYSTEM-I ; TRIACYLGLYCEROL ACCUMULATION ; PLANTS ; PHOTOSYNTHESIS ; TRANSCRIPTOME ; SPECIFICITY ; ARABIDOPSIS ; METABOLISM
语种: 英语
WOS记录号: WOS:000362483500001
ISSN号: 2045-2322
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/27268
Appears in Collections:藻类生物学及应用研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.SINOPEC Res Inst Petr Proc, Beijing, Peoples R China
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