[Objective] This study was to screen the economic or stable PCR system of rice and detect the generality of the selected system in different molecular markers based on PCR.[Method] With DNA extracted from rice leaves ...[Objective] This study was to screen the economic or stable PCR system of rice and detect the generality of the selected system in different molecular markers based on PCR.[Method] With DNA extracted from rice leaves by CTAB method as the template,PCR system was optimized by L16(45)orthogonal design.[Result] Clear bands were amplified from 16 different combinations,but the amplification effects and yields had difference.The most economic and applicable system was as follows:20 ng DNA template,150 μmol/L dNT...展开更多
Rice blast is one of the important diseases in major rice producing areas of China. The main blast resistance genes Pi-ta and Pi-b showed broad-spectrum and durable resistance to rice blast in many rice growing areas ...Rice blast is one of the important diseases in major rice producing areas of China. The main blast resistance genes Pi-ta and Pi-b showed broad-spectrum and durable resistance to rice blast in many rice growing areas of China, which have been widely utilized in rice breeding and commercial production. In this study, on the basis of detection and verification of the genotypes of 22 rice varieties har- boring known blast resistance genes （Pi-ta and Pi-b） and blast susceptibility genes （pi-ta and pi-b）, two multiple PCR systems for these genes were established by us- ing the functional markers of blast resistance genes Pi-ta and Pi-b as well as blast susceptibility genes pi-ta and pi-b, respectively. Specifically, multiple PCR system I could simultaneously detect blast resistance genes Pi-ta and Pi-b, while system II could detect simultaneously blast susceptibility genes pi-ta and pi-b. In addition, the genotypes of 336 high generation breeding materials were detected with these two multiple PCR systems. The results were highly consistent with those of conventional single mark detection, indicating that these two multiplex PCR systems were stable, reliable and time-saving. The established multiplex PCR systems may serve as a rapid and efficient method to identify and screen rice germplasm resources and can be applied in marker-assisted selection to polymerize multiple genes for blast resis- tance in rice breeding.展开更多
[Objective] The aim of this study is to establish and optimize the ISSR-PCR system in roughskin sculpin(Trachidermus fasciatus Heckel).[Method] By using the primer of ISSR-63,the concentrations of Taq DNA polymerase,M...[Objective] The aim of this study is to establish and optimize the ISSR-PCR system in roughskin sculpin(Trachidermus fasciatus Heckel).[Method] By using the primer of ISSR-63,the concentrations of Taq DNA polymerase,Mg2+,dNTPs and primer were optimized by orthogonal design for establishing the suitable ISSR-PCR system in roughskin sculpin;moreover,the suitable anneal temperature was yielded from gradient PCR on temperature.[Result]The optimized ISSR-PCR system(20 μl reaction volume)in roughskin sculpin was proved to be:2.5 mmol/L Mg2+,250 μmol/L dNTPs,0.25 μmol/L primer,1 U Taq DNA polymerase,30 ng DNA template and 1×PCR buffer;and suitable anneal temperature was determined to be 50.8 ℃.The established system was further confirmed by using 24 wild roughskin sculpin samples.[Conclusion]The results lay a foundation for the analysis of genetic diversity and germplasm resources of roughskin sculpin.展开更多
[Objective]The research aimed study the amplification condition of SRAP-PCR of ginseng genome and set up the optimized amplification system/[Method]The effects of template DNA,primer,dNTP mixture and Mg^2＋ on PCR res...[Objective]The research aimed study the amplification condition of SRAP-PCR of ginseng genome and set up the optimized amplification system/[Method]The effects of template DNA,primer,dNTP mixture and Mg^2＋ on PCR results were discussed.[Result] The optimized amplification procedure was as follows：pre-denaturing at 94 ℃ for 2 min;denaturing at 94 ℃ for 30 s,annealing at 48 ℃ for 30 s and extending at 72 ℃ for 1 min,40 cycles;extending at 72 ℃ for 7 min.The optimum reaction system was as follows：30 ng DNA template,2.0 μM upstream primer and downstream primer,0.3 mM dNTP mixture,2.5 Mm Mg2＋,the total volume was 25 μl.[Conclusion]The optimization amplification system for SRAP-PCR of ginseng was set up,which provided rapid and simplified test methods with good repeatability for SRAP analysis of the genetic relationship and genetic diversity of ginseng.展开更多
[Objective] This study aimed to establish a multiplex PCR system for de- tecting transgenic ingredients from Citrus. [Method] Based on the pBI121 plasmid sequences published in GenBank and actin gene sequence of Citru...[Objective] This study aimed to establish a multiplex PCR system for de- tecting transgenic ingredients from Citrus. [Method] Based on the pBI121 plasmid sequences published in GenBank and actin gene sequence of Citrus, the primers specific to CaMV35S promoter, NOS promoter, NOS terminator and actin gene were designed, to establish a multiple PCR system which could detect four types of sequences. In addition, orthogonal tests were performed to determine the optimal concentrations of all the components in PCR reaction system, as well as the optimal PCR cycle parameters. [Result] The optimal PCR reaction system should contain 2.5μl of 10xPCR buffer, 2.0μl of MgCI2 （25 mmol/L）, 2.0 μl of dNTP mixture （2.5 mmol/L of each dNTP）, 1.0 μl of actin gene primers （10μmol/L）, 1.0μl of 35S promoter primers （10 μmol/L）, 1.5 μl of NOS promoter primers （10 μmol/L） and 0.5 μl of NOS terminator primers （10μmol/L）, 0.1 μg of template DNA, 1.25 U of Taq DNA polymerase; ddH20 was added to the total reaction system of 25μl. The PCR reaction program consisted of pre-denaturing at 94℃ for 5 min; 31 cycles of denaturing at 94℃ for 30 s, annealing at 64.1℃ for 45 s and extension at 72℃ for 50 s; final extension at 72℃ for 10 min. The reaction system optimized with the orthogonal tests could detect as less as 0.1% transgenic component in the tested samples. [Conclusion] The MPCR detection system established in this study can meet the requirements in theory for detecting the genetically modified ingredients in Citrus or the deep-processed products.展开更多
Potato variety Kexin18 was used as testing materials in this research to study the influence on main components in multiplex PCR system, different primer ratios and annealing temperatures in SSR marker amplification. ...Potato variety Kexin18 was used as testing materials in this research to study the influence on main components in multiplex PCR system, different primer ratios and annealing temperatures in SSR marker amplification. Concentration and gradient experiments for four components （enzyme, MgCl2, DNA template and dNTPs） in PCR system were used in the research with the concentration of the other component remained the same; the orthogonal design L9 （34） was applied in the optimization of four sets of primers （STM0014, Pat, SSI, and UGP） in the reaction system at three levels; the temperature gradient selection was used to find out the optimum annealing temperature for the primer. The optimized multiplex PCR system of potato SSR marker with a total volume of 20 μL ： 2.5 μL 25 mmol.L-1 MgCl2, 0.6 μL 10 mmol·L-1 dNTPs, 0.8 U Taq, 80 ng DNA template was ultimately established through the comparison and analysis of test results; the ratio of four pairs of 4 mmol. L1 primers was 2 ： 1 ： 2 ： 3, and the annealing temperature was 54.7℃. The optimized reaction system could be repeated stably; and the stable and reliable amplification results were able to clearly distinguish different potato varieties. This research built the solid foundation for the further study of genetic diversity of potato germplasms and construction of DNA fingerprinting..展开更多
Objective:To evaluate the use of Real-Time PCR system based on specific amplification of matrix protein gene fragment for influenza A virus RNA detection in cloacal swabs from wild birds.Methods:Sensitivity,specificit...Objective:To evaluate the use of Real-Time PCR system based on specific amplification of matrix protein gene fragment for influenza A virus RNA detection in cloacal swabs from wild birds.Methods:Sensitivity,specificity and reproducibility of analysis results were identified. Study of cloacal swabs from wild birds for influenza A virus presence was performed.Results: Reproducibility of low concentrations of virus detection in samples by Real-Time PCR was significantly higher than that of detection based on cytopathic effect of viruses grown on MDCK cell culture.Conclusions:Real-Time PCR system for influenza A virus RNA detection is developed and applied for virus surveillance study.展开更多
Hypertrophic cardiomyopathy (HCM) is one of the diseases damaging people health most badly and some mutations of exons in cardiac troponin I (cTnI) gene are closely associated with family hypertrophic cardiomyopathy (...Hypertrophic cardiomyopathy (HCM) is one of the diseases damaging people health most badly and some mutations of exons in cardiac troponin I (cTnI) gene are closely associated with family hypertrophic cardiomyopathy (FHCM).A microarray was fabricated to screen mutations in exons 3,5,7,and 8 in cTnI gene.Primers were designed for the PCR (polymerase chain reaction) to amplify the target DNA fragments from fresh blood samples.In order to simplify the PCR process,multiplex PCR technology was investigated in detail.The concentration of Mg^(2+) played an important role in multiplex PCR process,a properly low concentration of Mg^(2+) submitted a better speciality of PCR products.The speciality was also favored when the annealing temperature was reasonably enhanced and 64℃is the optimal annealing temperature for the multiplex PCR systems.When applying the fabricated gene-chip to detect the target fragments from PCR mixture,the signal intensity sequence is in accordance with that from theoretic estimate.展开更多
Late blight caused by the oomycete Phytophthora infestans Montagne de Bary is a devastating disease on potato production. A total of six parameters affecting the PCR system in P. infestans were investigated based on t...Late blight caused by the oomycete Phytophthora infestans Montagne de Bary is a devastating disease on potato production. A total of six parameters affecting the PCR system in P. infestans were investigated based on the template DNA of the isolate HH06-23 and EST-SSR primer pair Pi08N. The results showed that the optimal annealing temperature was 63 ℃, and the optimum PCR system of EST-SSR was 25 ng template DNA, 0.5 mmol·L^-1 dNTPs, 2 μL 10×Buffer （Mg^2＋ free）, 1.75 mmol·L^-1 MgCl2, 15 pmol primer, and 1.2 U Taq DNA polymerase in total 20 μL reaction system. The PCR program was initial denaturation at 94℃ for 2 rain, followed by 35 cycles of 94℃ for 30 s, 63℃ for 30 s, and 72℃ for 30 s, then a final extension step was 72℃ for 7 min, and held at 4℃. In addition, using the optimal PCR system, a total of 20 isolates of P. infestans were used for testing the stability and polymorphism of the PCR amplification. The clarity and abundant polymorphism indicated that this system was stable and suitable for researching the genetic diversity ofP. infestans population.展开更多
[Objective] This study aimed to establish a quantitative real-time PCR （qRT-PCR） system for detecting the expression of rice beta-glucosidase gene Os1bglu4.[Method] The PCR was conducted with SYBR Green Ⅰ method,us...[Objective] This study aimed to establish a quantitative real-time PCR （qRT-PCR） system for detecting the expression of rice beta-glucosidase gene Os1bglu4.[Method] The PCR was conducted with SYBR Green Ⅰ method,using the primers of reference gene actin or ubiquitin.[Result] Actin was more suitable to be the reference gene than ubiquitin.More accurate results were obtained when the 100 ng cDNA template was added at a large volume and a lower concentration.The primer concentration in the range from 0.2 to 0.8 μmol/L we set had no significant influence on the results,so,0.4 μmol/L was selected as the optimal primer concentration in this study.The amplification efficiency was greatly reduced when the annealing temperature was set at 64 ℃,therefore,annealing temperature was set at 60 ℃.Compared with the reaction system of 25 μl,the fluorescence intensity was significantly lower but the CT value did not change greatly in 10 μl system.So,the 10 μl reaction system was selected,which significantly reduces the research costs for the detection of a large amount of samples in future study.展开更多
This study was conducted to develop a method for accurate quantification of Mycoplasma hyopneumoniae during vaccine production or experimental research. Primer and probe concentration that gave the highest ΔRn and th...This study was conducted to develop a method for accurate quantification of Mycoplasma hyopneumoniae during vaccine production or experimental research. Primer and probe concentration that gave the highest ΔRn and the lowest Ct were selected to establish the real-time PCR system for the detection of M. hyopneumoniae. Template DNA of M. hyopneumoniae was extracted by boiling under different conditions and detected by real-time PCR to determine the optimal conditions for DNA extraction. Thereafter, intra-and inter-batch reproducibility tests were carried out using a standard plasmid to evaluate the stability of the PCR system. Subsequently, the effect of medium composition on the quantitative detection was evaluated. Finally, the correlation between real-time PCR and CCU method was explored. The optimal primer and probe concentration for real-time PCR were 0.4 and 0.2 μmol/L, respectively. The intra-and inter-batch coefficients of variation(CV) in Ct value of 10~4-10~9 copies/μl standard plasmid were <5%, indicating good reproducibility of the real-time PCR system. Following incubation in a boiling water bath for 10 min, M. hyopneumoniae samples can be used directly as a template in subsequent real-time PCR assays,and good intra-batch and inter-batch reproducibility was observed. The working concentration of KM2 medium should be less than the 1/10 of the concentration of the stock solution to minimize its influence on the quantitative detection. Spearman's correlation analysis revealed that the log of CCU and the log of DNA copy number had a significant positive relationship(r=0.797,P=0.000). Thus, the two methods can be used in combination in the quantitative detection of M. hyopneumoniae. In summary, a rapid, stable and accurate quantitative PCR system for detecting M. hyopneumoniae culture was established in this study, which provides a technical means for accurate quantification of M. hyopneumoniae in vaccine production and laboratory tests.展开更多
With Portulaca oleracea L. as an experimental material, its total DNA was extracted by the improved CTAB method, the ISSR-PCR primers were screened, and the ISSR-PCR reaction system and reaction conditions for P. oler...With Portulaca oleracea L. as an experimental material, its total DNA was extracted by the improved CTAB method, the ISSR-PCR primers were screened, and the ISSR-PCR reaction system and reaction conditions for P. oleracea were Optimized. The results showed that there were 8 primers suitable for ISSR-PCR of P. oleracea. The optimal reaction system had a volume of 25 μl, including 2 x Taq Platinum PCR Master Mix 12.5 μl, primer 2 μl, ddH20 9.5 μl, and DNA template 1μl. The optimized ISSR-PCR of P. oleracea was started with pre-denaturation at 94 ℃ for 360 s, followed by 30 cycles of denaturation at 94 ℃ for 60 s, annealing at 54 ℃ for 60 s and extension at 72 ℃ for 90 s, and completed by extension at 72 ℃ for 300 s.展开更多
猫疱疹病毒I型(FHV-1)是威胁猫科动物健康的重要传染性疾病,本研究旨在研发一种灵敏、高效的FHV-1检测技术。依据GenBank上FHV-1 US6保守区域的基因序列,设计合成1对针对FHV-1 gD基因的引物,建立了一种SYBR Green I荧光定量PCR的检测方...猫疱疹病毒I型(FHV-1)是威胁猫科动物健康的重要传染性疾病,本研究旨在研发一种灵敏、高效的FHV-1检测技术。依据GenBank上FHV-1 US6保守区域的基因序列,设计合成1对针对FHV-1 gD基因的引物,建立了一种SYBR Green I荧光定量PCR的检测方法,构建标准曲线后分别验证该方法的特异性、敏感性、重复性,并将其进一步应用于人工感染猫产生的临床样本检测。结果:该特异性引物与猫杯状病毒(FCV)、猫细小病毒(FPV)和猫冠状病毒(FCoV)均未出现交叉反应,检测下限为14.78 copies/μL,组内和组间重复试验的变异系数均低于2%;该方法对临床样本的检出率比常规PCR高出25.46%;通过该方法检测人工感染FHV-1强毒后猫的每日排毒量,结果呈现上升趋势,与临床发病程度相符,猫的脏器病毒载量存在个体差异,但集中在心脏、肺脏、肠道和膀胱中检出。综上,该研究建立的SYBR Green I荧光定量PCR方法对FHV-1具有较好的特异性、灵敏度和重复性,为FHV-1感染的快速诊断以及疾病的防控提供方法支持。展开更多
基金Supported by the Key Project from Department of Science and Technology of Heilongjiang Province(GA06B102-3-4)the Key Project from Heilongjiang Provincial Reclamation General Administration(HNKXIV-01-01-02)~~
文摘[Objective] This study was to screen the economic or stable PCR system of rice and detect the generality of the selected system in different molecular markers based on PCR.[Method] With DNA extracted from rice leaves by CTAB method as the template,PCR system was optimized by L16(45)orthogonal design.[Result] Clear bands were amplified from 16 different combinations,but the amplification effects and yields had difference.The most economic and applicable system was as follows:20 ng DNA template,150 μmol/L dNT...
基金Supported by Agricultural Science and Technology Independent Innovation Fund of Jiangsu Province[CX(12)1003]Science and Technology Support Program of Jiangsu Province(BE2013301)Special Fund for the Construction of Modern Agriculture Industry System of China(CARS-01-47)~~
文摘Rice blast is one of the important diseases in major rice producing areas of China. The main blast resistance genes Pi-ta and Pi-b showed broad-spectrum and durable resistance to rice blast in many rice growing areas of China, which have been widely utilized in rice breeding and commercial production. In this study, on the basis of detection and verification of the genotypes of 22 rice varieties har- boring known blast resistance genes （Pi-ta and Pi-b） and blast susceptibility genes （pi-ta and pi-b）, two multiple PCR systems for these genes were established by us- ing the functional markers of blast resistance genes Pi-ta and Pi-b as well as blast susceptibility genes pi-ta and pi-b, respectively. Specifically, multiple PCR system I could simultaneously detect blast resistance genes Pi-ta and Pi-b, while system II could detect simultaneously blast susceptibility genes pi-ta and pi-b. In addition, the genotypes of 336 high generation breeding materials were detected with these two multiple PCR systems. The results were highly consistent with those of conventional single mark detection, indicating that these two multiplex PCR systems were stable, reliable and time-saving. The established multiplex PCR systems may serve as a rapid and efficient method to identify and screen rice germplasm resources and can be applied in marker-assisted selection to polymerize multiple genes for blast resis- tance in rice breeding.
基金Supported by High Tech Project from Sci-tech Department of Jiangsu Province(BG2006337)~~
文摘[Objective] The aim of this study is to establish and optimize the ISSR-PCR system in roughskin sculpin(Trachidermus fasciatus Heckel).[Method] By using the primer of ISSR-63,the concentrations of Taq DNA polymerase,Mg2+,dNTPs and primer were optimized by orthogonal design for establishing the suitable ISSR-PCR system in roughskin sculpin;moreover,the suitable anneal temperature was yielded from gradient PCR on temperature.[Result]The optimized ISSR-PCR system(20 μl reaction volume)in roughskin sculpin was proved to be:2.5 mmol/L Mg2+,250 μmol/L dNTPs,0.25 μmol/L primer,1 U Taq DNA polymerase,30 ng DNA template and 1×PCR buffer;and suitable anneal temperature was determined to be 50.8 ℃.The established system was further confirmed by using 24 wild roughskin sculpin samples.[Conclusion]The results lay a foundation for the analysis of genetic diversity and germplasm resources of roughskin sculpin.
文摘[Objective]The research aimed study the amplification condition of SRAP-PCR of ginseng genome and set up the optimized amplification system/[Method]The effects of template DNA,primer,dNTP mixture and Mg^2＋ on PCR results were discussed.[Result] The optimized amplification procedure was as follows：pre-denaturing at 94 ℃ for 2 min;denaturing at 94 ℃ for 30 s,annealing at 48 ℃ for 30 s and extending at 72 ℃ for 1 min,40 cycles;extending at 72 ℃ for 7 min.The optimum reaction system was as follows：30 ng DNA template,2.0 μM upstream primer and downstream primer,0.3 mM dNTP mixture,2.5 Mm Mg2＋,the total volume was 25 μl.[Conclusion]The optimization amplification system for SRAP-PCR of ginseng was set up,which provided rapid and simplified test methods with good repeatability for SRAP analysis of the genetic relationship and genetic diversity of ginseng.
基金Supported by the Special Fund for Key Laboratories of Chongqing (CSTC)National Technology Research and Development Program of Ministry of Science and Technology for Countryside Field (863 Program,2011AA100205)+1 种基金Special Fund for Agro-scientific Research in the Public Interest of Ministry of Agriculture of China(201003067)Key Science and Technology Research Program of Ministry of Education of China (109131)~~
文摘[Objective] This study aimed to establish a multiplex PCR system for de- tecting transgenic ingredients from Citrus. [Method] Based on the pBI121 plasmid sequences published in GenBank and actin gene sequence of Citrus, the primers specific to CaMV35S promoter, NOS promoter, NOS terminator and actin gene were designed, to establish a multiple PCR system which could detect four types of sequences. In addition, orthogonal tests were performed to determine the optimal concentrations of all the components in PCR reaction system, as well as the optimal PCR cycle parameters. [Result] The optimal PCR reaction system should contain 2.5μl of 10xPCR buffer, 2.0μl of MgCI2 （25 mmol/L）, 2.0 μl of dNTP mixture （2.5 mmol/L of each dNTP）, 1.0 μl of actin gene primers （10μmol/L）, 1.0μl of 35S promoter primers （10 μmol/L）, 1.5 μl of NOS promoter primers （10 μmol/L） and 0.5 μl of NOS terminator primers （10μmol/L）, 0.1 μg of template DNA, 1.25 U of Taq DNA polymerase; ddH20 was added to the total reaction system of 25μl. The PCR reaction program consisted of pre-denaturing at 94℃ for 5 min; 31 cycles of denaturing at 94℃ for 30 s, annealing at 64.1℃ for 45 s and extension at 72℃ for 50 s; final extension at 72℃ for 10 min. The reaction system optimized with the orthogonal tests could detect as less as 0.1% transgenic component in the tested samples. [Conclusion] The MPCR detection system established in this study can meet the requirements in theory for detecting the genetically modified ingredients in Citrus or the deep-processed products.
基金Supported by the International Cooperation Project of Heilongjiang Science and Technology Department (WC05B08)
文摘Potato variety Kexin18 was used as testing materials in this research to study the influence on main components in multiplex PCR system, different primer ratios and annealing temperatures in SSR marker amplification. Concentration and gradient experiments for four components （enzyme, MgCl2, DNA template and dNTPs） in PCR system were used in the research with the concentration of the other component remained the same; the orthogonal design L9 （34） was applied in the optimization of four sets of primers （STM0014, Pat, SSI, and UGP） in the reaction system at three levels; the temperature gradient selection was used to find out the optimum annealing temperature for the primer. The optimized multiplex PCR system of potato SSR marker with a total volume of 20 μL ： 2.5 μL 25 mmol.L-1 MgCl2, 0.6 μL 10 mmol·L-1 dNTPs, 0.8 U Taq, 80 ng DNA template was ultimately established through the comparison and analysis of test results; the ratio of four pairs of 4 mmol. L1 primers was 2 ： 1 ： 2 ： 3, and the annealing temperature was 54.7℃. The optimized reaction system could be repeated stably; and the stable and reliable amplification results were able to clearly distinguish different potato varieties. This research built the solid foundation for the further study of genetic diversity of potato germplasms and construction of DNA fingerprinting..
文摘Objective:To evaluate the use of Real-Time PCR system based on specific amplification of matrix protein gene fragment for influenza A virus RNA detection in cloacal swabs from wild birds.Methods:Sensitivity,specificity and reproducibility of analysis results were identified. Study of cloacal swabs from wild birds for influenza A virus presence was performed.Results: Reproducibility of low concentrations of virus detection in samples by Real-Time PCR was significantly higher than that of detection based on cytopathic effect of viruses grown on MDCK cell culture.Conclusions:Real-Time PCR system for influenza A virus RNA detection is developed and applied for virus surveillance study.
文摘Hypertrophic cardiomyopathy (HCM) is one of the diseases damaging people health most badly and some mutations of exons in cardiac troponin I (cTnI) gene are closely associated with family hypertrophic cardiomyopathy (FHCM).A microarray was fabricated to screen mutations in exons 3,5,7,and 8 in cTnI gene.Primers were designed for the PCR (polymerase chain reaction) to amplify the target DNA fragments from fresh blood samples.In order to simplify the PCR process,multiplex PCR technology was investigated in detail.The concentration of Mg^(2+) played an important role in multiplex PCR process,a properly low concentration of Mg^(2+) submitted a better speciality of PCR products.The speciality was also favored when the annealing temperature was reasonably enhanced and 64℃is the optimal annealing temperature for the multiplex PCR systems.When applying the fabricated gene-chip to detect the target fragments from PCR mixture,the signal intensity sequence is in accordance with that from theoretic estimate.
基金Supported by Natural Science Foundation of Heilongjiang Province of China (C200622)
文摘Late blight caused by the oomycete Phytophthora infestans Montagne de Bary is a devastating disease on potato production. A total of six parameters affecting the PCR system in P. infestans were investigated based on the template DNA of the isolate HH06-23 and EST-SSR primer pair Pi08N. The results showed that the optimal annealing temperature was 63 ℃, and the optimum PCR system of EST-SSR was 25 ng template DNA, 0.5 mmol·L^-1 dNTPs, 2 μL 10×Buffer （Mg^2＋ free）, 1.75 mmol·L^-1 MgCl2, 15 pmol primer, and 1.2 U Taq DNA polymerase in total 20 μL reaction system. The PCR program was initial denaturation at 94℃ for 2 rain, followed by 35 cycles of 94℃ for 30 s, 63℃ for 30 s, and 72℃ for 30 s, then a final extension step was 72℃ for 7 min, and held at 4℃. In addition, using the optimal PCR system, a total of 20 isolates of P. infestans were used for testing the stability and polymorphism of the PCR amplification. The clarity and abundant polymorphism indicated that this system was stable and suitable for researching the genetic diversity ofP. infestans population.
基金Supported by Guizhou International Cooperation Project on Science and Technology[(2013)7040]the 20th Project of the Joint Committee on Scientific and Technical Cooperation between the Government of the Kingdom of Thailand and the Government of the People’s Republic of China (20-606J)the Fund from Suranaree University of Technology,Thailand (SUT3-304-54-12-29)
文摘[Objective] This study aimed to establish a quantitative real-time PCR （qRT-PCR） system for detecting the expression of rice beta-glucosidase gene Os1bglu4.[Method] The PCR was conducted with SYBR Green Ⅰ method,using the primers of reference gene actin or ubiquitin.[Result] Actin was more suitable to be the reference gene than ubiquitin.More accurate results were obtained when the 100 ng cDNA template was added at a large volume and a lower concentration.The primer concentration in the range from 0.2 to 0.8 μmol/L we set had no significant influence on the results,so,0.4 μmol/L was selected as the optimal primer concentration in this study.The amplification efficiency was greatly reduced when the annealing temperature was set at 64 ℃,therefore,annealing temperature was set at 60 ℃.Compared with the reaction system of 25 μl,the fluorescence intensity was significantly lower but the CT value did not change greatly in 10 μl system.So,the 10 μl reaction system was selected,which significantly reduces the research costs for the detection of a large amount of samples in future study.
基金Supported by National Key Research and Development Project of China(2017YFD0501604)National Natural Science Foundation of China(31400164)
文摘This study was conducted to develop a method for accurate quantification of Mycoplasma hyopneumoniae during vaccine production or experimental research. Primer and probe concentration that gave the highest ΔRn and the lowest Ct were selected to establish the real-time PCR system for the detection of M. hyopneumoniae. Template DNA of M. hyopneumoniae was extracted by boiling under different conditions and detected by real-time PCR to determine the optimal conditions for DNA extraction. Thereafter, intra-and inter-batch reproducibility tests were carried out using a standard plasmid to evaluate the stability of the PCR system. Subsequently, the effect of medium composition on the quantitative detection was evaluated. Finally, the correlation between real-time PCR and CCU method was explored. The optimal primer and probe concentration for real-time PCR were 0.4 and 0.2 μmol/L, respectively. The intra-and inter-batch coefficients of variation(CV) in Ct value of 10~4-10~9 copies/μl standard plasmid were <5%, indicating good reproducibility of the real-time PCR system. Following incubation in a boiling water bath for 10 min, M. hyopneumoniae samples can be used directly as a template in subsequent real-time PCR assays,and good intra-batch and inter-batch reproducibility was observed. The working concentration of KM2 medium should be less than the 1/10 of the concentration of the stock solution to minimize its influence on the quantitative detection. Spearman's correlation analysis revealed that the log of CCU and the log of DNA copy number had a significant positive relationship(r=0.797,P=0.000). Thus, the two methods can be used in combination in the quantitative detection of M. hyopneumoniae. In summary, a rapid, stable and accurate quantitative PCR system for detecting M. hyopneumoniae culture was established in this study, which provides a technical means for accurate quantification of M. hyopneumoniae in vaccine production and laboratory tests.
文摘With Portulaca oleracea L. as an experimental material, its total DNA was extracted by the improved CTAB method, the ISSR-PCR primers were screened, and the ISSR-PCR reaction system and reaction conditions for P. oleracea were Optimized. The results showed that there were 8 primers suitable for ISSR-PCR of P. oleracea. The optimal reaction system had a volume of 25 μl, including 2 x Taq Platinum PCR Master Mix 12.5 μl, primer 2 μl, ddH20 9.5 μl, and DNA template 1μl. The optimized ISSR-PCR of P. oleracea was started with pre-denaturation at 94 ℃ for 360 s, followed by 30 cycles of denaturation at 94 ℃ for 60 s, annealing at 54 ℃ for 60 s and extension at 72 ℃ for 90 s, and completed by extension at 72 ℃ for 300 s.
文摘猫疱疹病毒I型(FHV-1)是威胁猫科动物健康的重要传染性疾病,本研究旨在研发一种灵敏、高效的FHV-1检测技术。依据GenBank上FHV-1 US6保守区域的基因序列,设计合成1对针对FHV-1 gD基因的引物,建立了一种SYBR Green I荧光定量PCR的检测方法,构建标准曲线后分别验证该方法的特异性、敏感性、重复性,并将其进一步应用于人工感染猫产生的临床样本检测。结果:该特异性引物与猫杯状病毒(FCV)、猫细小病毒(FPV)和猫冠状病毒(FCoV)均未出现交叉反应,检测下限为14.78 copies/μL,组内和组间重复试验的变异系数均低于2%;该方法对临床样本的检出率比常规PCR高出25.46%;通过该方法检测人工感染FHV-1强毒后猫的每日排毒量,结果呈现上升趋势,与临床发病程度相符,猫的脏器病毒载量存在个体差异,但集中在心脏、肺脏、肠道和膀胱中检出。综上,该研究建立的SYBR Green I荧光定量PCR方法对FHV-1具有较好的特异性、灵敏度和重复性,为FHV-1感染的快速诊断以及疾病的防控提供方法支持。
