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茉莉酸甲酯处理雷公藤悬浮细胞的基因差异表达分析
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摘要
雷公藤(Tripterygium wilfordii Hook.f.)作为一种具有很好应用和开发前景的农用资源植物,其市场需求日益加大。为利用现代生物技术调控雷公藤次生代谢产物生物碱的生物合成提供依据,本文以茉莉酸甲酯(MeJA)为诱导子,采用继代3周的雷公藤悬浮细胞为材料,通过cDNA-AFLP技术分析了MeJA诱导处理前后雷公藤悬浮细胞中差异基因的表达情况,主要得到了以下结论:
     1 MeJA在50μM至400μM浓度范围内对雷公藤总生物碱含量的积累呈抑制作用。未用MeJA处理的悬浮细胞中总生物碱的含量达到了624.13μg·g~(-1) ,而不同浓度MeJA处理对总生物碱的积累影响不同,其中200μM浓度处理下总碱的含量略高于其他处理浓度,为478.76μg·g~(-1),仍然低于未用MeJA处理的。
     2通过优化RNA的提取、酶切、连接、预扩增和选择性扩增等步骤,建立了适宜MeJA诱导下雷公藤悬浮细胞差异基因表达的cDNA-AFLP体系。
     3利用64对AFLP扩增引物对处理和对照的cDNA进行AFLP分析和Blastn生物信息比对,共筛选到19条明显差异表达的cDNA片段。其中有7条找到同源序列,这些基因可能参与了细胞中的信号转导,转录调控和能量代谢等。12条未在数据库中找到同源信息,推测为未知基因,有待进一步验证。
     4在比对出的7条TDFs中,A2T4C4片段与MYB蛋白基因同源(Blastn比对结果为100%)。MYB蛋白做为一类转录因子组成的一部分,对揭示次生代谢物转录调节机制有重要意义,推测MYB基因可能参与了茉莉酸甲酯调控的雷公藤悬浮细胞次生代谢物质的合成。对此,有待于获得A2T4C4片段其全长序列,并转入雷公藤悬浮细胞培养体系,在雷公藤悬浮细胞中做转化验证。
As an excellent application and development prospects botanical pesticides,the market demand of Tripterygiun wilfordii Hook. f is gradually increasing. In order to provide the basis for taking advantage of modern biological technology regulation tripterygium wilfordii secondary metabolite biosynthesis of alkaloids, cell suspension culture of tripterygium wilfordii was taken as tested plant material in this study. cDNA amplified fragment length polymorphism analysis (cDNA-AFLP) was used to display transcripts whose expression is rapidly altered during the treatment of Methyl Jasmonate (MeJA) to cell suspension culture of tripterygium wilfordii. Two sixty and four primer combinations were used for selective amplification. The main results were as follows:
     1 The total alkaloids production was inhibited to some extent when MeJA was added into the medium. The total alkaloids production went to 624.13μg·g~(-1) (DW)in the control. The alkaloids production in cell suspension culture with 200μM MeJA treated reached 478.76μgg~(-1) (DW), lightly higher than the other concentrations, was still lower than control.
     2 Through optimization experiment steps including: restriction enzymes cut, ligation, pre- amplified and amplification, an optimized cDNA– AFLP system of differentially expressed genes in the suspension cell culture of tripterygiun wilfordii Hook. f with elictor MeJA was established.
     3 64 pairs of AFLP amplification primers were used to analyze the cDNA of the treated and control. Among the transcript derived fragments (TDFs), by further re-PCR amplification, cloning and sequencing,through blast analysis of the sequences we know that: seven fragments were found to be involved in the cells of the signal transduction, transcription regulation and energy metabolism in GenBank, however the other twelve fragments were found no significant homologous sequences in data base, probably they were new cDNA sequences specific to cell suspension culture of tripterygium wilfordii.
     4 By blast of these sequences in GenBank, Homologous analysis indicated that No.A2T4C4 fragment was acquainted identical to MYB-like protein gene(Maxident 100%). MYB protein as a kind of transcription factors is critical to reveal the mechanism of secondary metabolites transcriptional regulation. Presumably, MYB protein gene may be involved in the regulation of MeJA to tripterygium wilfordii cells suspension culture secondary metabolites biosynthesis. So, No.A2T4C4 fragment is important for further understanding of the function of MYB genes and the molecular mechanism of tripterygium wilfordii total alkaloids biosynthesis.
引文
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