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海萝(Gloiopeltis furcata)抗氧化酶系与失水响应因子表达模式分析
刘顺1, 胡自民1, 张全胜2, 段德麟1
1.中国科学院海洋研究所;2.烟台大学
摘要:
潮间带红藻海萝(Gloiopeltis furcata)对失水胁迫具有很强的耐受能力。为探索海萝周期性失水过程中的响应机制,我们在24 h内设计了两次连续的失水—复水循环处理,测定了海萝抗氧化酶活力的变化情况。同时,我们利用转录组测序技术,结合荧光定量PCR方法(qRT-RCR),对海萝失水响应基因的转录表达进行了验证。结果如下:海萝转录组共组装到32681条基因。与对照组相比,处理组共表达了7161条差异表达基因(differentially expressed genes,DEGs)。KEGG分析显示,DEGs分布在代谢、环境信息加工、有机体系统、遗传信息加工、细胞进程等方面。海萝抗氧化酶活力测定发现,抗氧化能力对海萝响应失水胁迫十分重要。过氧化氢酶(CAT)、硫氧还蛋白还原酶(TrxR)、超氧化物歧化酶(SOD)参与抗氧化过程,其中CAT酶活力对海萝抵抗失水胁迫尤为重要。此外,qRT-PCR结果显示,海萝中渗透调节物质红藻糖苷合成的相关基因(GfUGPase、GfGK、GfGPDH)只对初次失水处理有正响应。而热激蛋白70基因(GfHSP70)、碳酸酐酶基因(GfCA)、MYB蛋白编码基因(GfMYB)以及谷胱甘肽S转移酶基因(GfGST)在两次失水过程中其转录水平均有上调表达,它们也参与了海萝失水响应机制。本研究为探索潮间带红藻周期性失水响应过程提供了理论依据,对研究红藻失水适应性分子机制有重要的参考价值。
关键词:  海萝,失水,抗氧化酶,红藻糖苷,转录组
DOI:10.11759/hykx20190404002
分类号:
基金项目:国家自然科学基金国际(地区)合作项目(41761144057);山东省重点科技研发项目(2018SDKJ0502-1)
The expression patterns of antioxidant enzymes and desiccation response factors in Gloiopeltis furcata ( Gigartinales, Rhodophyta)
Liu Shun1, Hu Zimin1, Zhang Quansheng2, Duan Delin1
1.Institute of Oceanology, Chinese Academy of Sciences;2.Yantai University
Abstract:
The intertidal red algae Gloiopeltis furcata has strong resistant ability to dehydration stress. In order to explore the responding mechanisms in periodic water loss processes of G. furcata, we designed two successive desiccation-dehydration cycles within 24 hrs and measured the changes of antioxidant enzymes activities in G. furcata. Transcriptome sequencing and quantitative reverse transcription-PCR technology (qRT-PCR) were used to verify the transcriptional expression patterns of dehydration response genes. A total of 32681 unigenes were assembled in transcripts。Compared with the control group, 7,161 differentially expressed genes (DEGs) were expressed in the treatment groups. KEGG analysis indicated that the DEGs were related to metabolism, environmental information processing, organismal system, genetic information processing and cell processes. The results of antioxidant enzymes activity assay showed that, the antioxidant capacity was crucial for G. furcata in response to dehydration stress. Catalase (CAT), thioredoxin reductase (TrxR) and superoxide dismutase (SOD) participate in antioxidant process, and the activity of CAT is particularly important for the resistance to water loss. In addition, qRT-PCR results showed that, genes involved in synthesis of floridoside (GfUGPase, GfGK, GfGPDH) only positively responded to the first desiccation treatment. In addition, The transcription levels of genes encoded heat shock protein 70 (GfHSP70), carbonic anhydrase (GfCA), MYB-domain contain protein (GfMYB) and glutathione S-transferase (GfGST) were up-regulated during two dehydration periods, they also participate in the mechanisms of desiccation response of G. furcata. This study provides reference for understanding how intertidal red seaweeds respond to periodic dehydration and its related molecular mechanisms. This study provides theoretical basis for exploring how intertidal red seaweeds respond to periodic dehydration, and has important reference value for studying molecular mechanisms of adaptation to dehydration in red seaweeds.
Key words:  Gloiopeltis furcata, desiccation, antioxidant enzymes, floridoside, transcriptome
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