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半夏试管小块茎的发育及其相关基因差异表达的研究
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摘要
半夏(Pinellia ternata Thunb.Briet)根状茎中含有半夏蛋白、鞣质和生物碱等药用成分,是我国一种特有的药用植物。半夏因病毒而引起的品种退化常导致种源不足、产量与品质严重下降,这已成为半夏生产上的主要障碍之一,通过茎尖分生组织脱除病毒培养的半夏苗和试管块茎等生物技术手段是生产上提供人工种子和提高产量品质的重要解决途径。半夏试管块茎是组织培养条件下诱导的变态茎,其遗传稳定性、生理生化特性上与常规块茎无异,半夏生产研究对此特别重视,但其试管小块茎的形成机理尚不清楚,生产效率不高,应用上尚存在着许多困难。本研究旨在添加不同内源激素抑制剂,研究半夏试管小块茎形成过程中内源激素的变化状况与小块茎形成相关基因的表达模式,探索块茎形成的调控机理,为半夏试管块茎生产提供理论和技术基础。主要研究结果如下:
     通过MS基本培养基中不同浓度GA抑制剂(矮壮素,CCC)处理,对半夏试管块茎膨大和内源激素含量有一定影响。在半夏试管块茎形成过程中,CCC能有效的增加块茎重量,抑制GA_3,IAA,ZR的合成,并呈现出随着药剂浓度的增大而降低的趋势。CCC还能有效地影响ABA和JA含量,使之分别呈“V”型和“J”型。
     通过MS基本培养基中不同浓度ABA抑制剂(哒草伏,NOR)处理,对半夏试管块茎膨大和内源激素含量有明显影响。在半夏试管块茎形成过程中,NOR能有效的减少块茎重量,抑制ABA,IAA,JA的合成,使JA含量变化呈“N”型。NOR还能有效地影响GA_3和ZR含量。
     通过MS基本培养基中不同浓度JA抑制剂(水杨基异羟肟酸,SHAM)处理,对半夏试管块茎膨大和内源激素含量有明显影响。在半夏试管块茎形成过程中,SH AM能有效的推迟半夏块茎形成时间,促进在块茎形成后期GA_3,IAA,ZR的合成,但都低于对照。SHAM有效抑制JA的合成,同时还能有效地影响ABA,使之呈下降趋势。
     提出了一种从半夏块茎中有效地提取高质量总RNA的方法。将常规的异硫氰酸胍提取植物总RNA的方法做了改进,建立起一种简单实用的从富含多酚类和多糖等物质的植物材料中提取总RNA的方法。该方法所提RNA的A_(260)/A_(230)均大于2.0,A_(260)/A_(280)的值为1.7~2.0,电泳条带清晰,RNA完整性好。利用该方法提取的半夏试管小块茎总RNA具有很高的质量和纯度,且得率很高,完全满足后续的DDRT-PCR分子生物学研究。
     建立并优化了半夏块茎诱导前后银染mRNA差别显示条件。利用正交试验设计,从模板、Mg~(2+)、dNTPs、引物和DNA聚合酶5种因素4个水平,筛选并建立了半夏试管小块茎诱导的DDRT-PCR反应最佳体系。得到稳定且扩出最多条带的适合半夏试管小块茎诱导的DDRT-PCR最佳反应体系,即20μL的反应体系中含有dNTPs 150μmol/L,Taq酶0.6 U,锚定引物2μmol/L,随机引物1μmol/L,Mg~(2+)2.5mmol/L,2μL 10×buffer和2.5μg的cDNA模板。各因素影响程度依次为Taq酶浓度>cDNA模板浓度>dNTPs浓度>Mg~(2+)浓度>引物浓度。
     利用mRNA差异显示技术分离和克隆了半夏试管小块茎发育的相关基因片段。应用mRNA差异显示(DDRT-PCR)方法比较分析了半夏试管小块茎发育过程中的基因表达差异。结果分离到了15个半夏试管小块茎发育过程中特异表达的cDNA片段,在GenBank中进行同源性比较发现后6个没有同源序列与之匹配;前3个片段推导的氨基酸序列分别与真核生物启动子,MADS-box蛋白和乙烯信号转导因子有高度同源性。半定量RT-PCR进一步证实它们存在,并在半夏生成不同天数高度特异表达。其中,这三个片段所推定的氨基酸都与块茎的发育有关,这为探讨半夏块茎发育分子机制提供了新资料。
Pinellia ternata(Thunb.) Briet.enriched with the medicinal ingredients of protein, tannim and alkaloid is an important steroid medicine resources plant that is endemic to China.The degeneration in quality of Pinellia ternata,caused by virus diseases usually results in a serious loss of both tuber yield and quality,which has been a main hinder in production of PinelIia ternata,for long time.Virus-elimination through meristem culture has been widely used in the seedling and microtubers of Pinellia ternata.and the development of biotechnology is important channels to resolve the production of artificial seeds and the improvment yield and quality.The microtuber of Pinellia ternata.,which is induced from the upper of leaf stalks ends,has the same genetic stability,morphological and physiological characteristics compared with conventional tubers.Perspectives of using microtubers of Pinellia ternata,in seed system has,therefore,drawn great interests in research.However,the productivity of microtubers is relatively low since there is little information about the tuberization mechanism.With aims to look into this aspect,the experiments were laid out under various tuber inducing conditions and investigations of variation in endogenous hormones and expression of tuber-forming-relative-genes (TFRG) were carried out.The main results were as follows:
     Studied the effects of the inhibitor of gibberellins-biosynthesis on tuber enlargement and content of endogenous hormones of Pinellia ternata.Pinellia ternata microtubers were induced in the medium MS added with different concentration of CCC.The results showed that CCC could significantly add microtuber weight and inhibit the synthesis of GA_3,IAA,ZR and they were reduced as the content of CCC increased.Meanwhile,CCC could effectively influence the content of ABA and JA shaped as "V" and "J".
     Studied the effects of the inhibitor of abscissas acid -biosynthesis on tuber enlargement and content of endogenous hormones of Pinellia ternata.Microtubers were induced in the medium MS added with different concentration of NOR.The results showed that NOR could significantly reduce microtuber weight and inhibit the synthesis of ABA,IAA,JA and the content of JA shaped as"N".Meanwhile,NOR could effectively influence the content of GA_3 and ZR.
     Studied the effects of the inhibitor of jasmines acid-biosynthesis on tuber enlargement and content of endogenous hormones of Pinellia ternata.Microtubers of Pinellia ternata were induced in the medium MS added with different concentration of SHAM.The results showed that SHAM could significantly postponed the formation of microtuber time and promote the synthesis of GA_3,IAA,ZR,but the content of them were lower than collation.SHAM could effectively inhibited the synthesis of JA and decreased the content of ABA.
     A highly efficient method of isolating total RNA from microtubers of Pinellia ternata in vitro was developed in this study.By modifying the method recommended by Guanidinium for extracting total RNA from plant tissues rich in phenolic and polysaccharidic compounds,a simple and convenient method for extraction of total RNA from plant materials containing abundant polyphenols and polysaccharides was established.The value of RNA extracted with improved method A260/ A230 were all over 2.0 and the values of A260/ A280 were between 1.7 and 2.0.The electrophoresis bands cleared on agarosegel and integrity of RNA was good.The results showed that RNA obtained from rapeseed with this method had high purity and quality and could be used in molecular biological research,as DDRT-PCR and analysis directly.
     Establishment and optimization of sliver staining Differential Display of Pinellia ternate microtubers in vitro.The effects of five kinds of factors were studied by orthogonal design method including emplate cDNA,Mg~(2+),dNTPs,primers and Taq DNA polymerase,and in order to establish the optimum DDRT-PCR system of P.ternata. microtubers in vitro.A satisfactory DDRT-PCR technique system for P.ternata. Microtubers in vitro with desirable repeatability and polymorphic bands was established. In a total volume of 20μL DDRT-PCR system,it contained 10×buffer,150μmol/L dNTPs,2μmol/L anchor primer,1μmol/L arbitrary primer,2.5 mmol/L Mg~(2+),0.6 U Taq DNA polymerase and 2.5μg template cDNA.The effect of the five factors was in sequence of Taq DNA polymerase>template cDNA>dNTPs>Mg~(2+)>Primers.
     Identification of expressed gene fragments related to the microtubers develop- ment of Pinellia ternat in vitro,by DDRT-PCR.In this study,we identified and characterized eight cDNA fragments differentially expressed in the induction of microtubers of Pinellia ternata in vitro,using mRNA differential display DDRT-PCR.Deduced amino -acid sequences of five of the eight cDNA fragments showed no significant homology with ESTs and genes in the Genbank databases.However,the remaining three showed significant homologies with sequences encoding components of eukaryotic translation initiation factor 3 subunit H,MADS-box protein and ethylene signal transcription factor, respectively.Their differential expression patterns were confirmed by semi-quantitative RT-PCR analysis.And the expression level of the induction of microtubers of Pinellia ternata in vitro.were different.The three cDNA fragments deduced like protein were most likely involved in the microtubers development of Pinellia ternata,and the study gave us novel insights into the molecular mechanism of the microtubers development of Pinellia ternata.
引文
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