Performances and Germplasm Evaluation of Quantitative Resistance to Soybean Mosaic Virus in Soybeans     

ZHI Hai-jian  GAI Jun-yi 《中国农业科学(英文版)》2004,3(4)

A sample composed of 96 soybean accessions was evaluated for their diseased rate (I),diseased rank (S), latent period (LP) and rate of disease development (R) in order tostudy the quantitative resistance to soybean mosaic virus (SMV) in soybeans. The resultsshowed that the performances of the above four resistance components were significantlydifferent among accessions and that some of the accessions, such as Zhongzihuangdou,Peixian Tianedan, Youbian30 could be infected by four SMV strains, Sa, SC8, N1 and N3,but their I, S, and R were lower and LP longer than most other accessions. These resultsdemonstrated the existence of quantitative resistance to SMV in soybeans. It was foundthat some soybean accessions, such as AGS19 and Lishui Zhongzihuangdou, previouslyidentified as resistant to SMV infection, performed some infection but resistant toexpansion in the present study. In addition, the resistance in Pixian Chadou and HuaiyinQiuheidou might be either qualitative or quantitative. Furthermore, the present studyalso indicated that the resistance spectrum and durability of accessions with quantitativeresistance might be wider and longer than those with qualitative resistance.  相似文献   

Complete Sequence of Proviral DNA of Equine Infectious Anemia Virus Strain L     

LIU Hong-quan  WANG Liu  YANG Zhi-biao  KONG Xian-gang  TONG Guang-Zhi 《中国农业科学(英文版)》2002,1(2):232-237

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鸡痘病毒载体研究进展   总被引：1，自引：0，他引：1  

顾万钧  金宁一 《吉林农业大学学报》1995,17(4):89-95

本文就鸡痘病毒作为基因工程重组疫苗的重要载体研究的进展作以综述，主要包括鸡痘病毒表达载体的构建，外源基因在重组鸡痘病毒中的表达及免疫效果，并对鸡痘病毒载体的研究及开发应用前景加以展望。  相似文献   

缺失GDD保守区的黄瓜花叶病毒复制酶基因的克隆及植物表达载体构建          下载免费PDF全文

温瑞  郑重  周雪平 《浙江大学学报(农业与生命科学版)》2001,27(5):531-534

以CMV亚组1株系Fny-CMV RNA2基因组为模板,根据其序列设计引物进行PCR扩增,得到2.5 kb的全长复制酶基因扩增产物.对此产物进行纯化,并用NcoI和BspHI进行双酶切,得到3个片段,将不含有GDD保守区的2个片段用T4 DNA连接酶连接,并对连接产物进行PCR扩增,得到2.2kb左右缺失GDD保守区的黄瓜花叶病毒复制酶基因的扩增产物.将其克隆到pGEM-T Easy Vector上,进行序列测定,结果表明GDD保守区确已缺失.该缺失不导致开放阅读框架的移码将缺失GID保守区的基因定向克隆到植物表达载体pBI121中,并经三亲交配导入根癌农杆菌中,经PCR及酶切鉴定,证实质粒已被导入.  相似文献   

The Lapinized Chinese Strain Vaccine Against Classical Swine Fever Virus： A Retrospective Review Spanning Half A Century   总被引：2，自引：0，他引：2  

QIU Hua-ji SHEN Rong-xian TONG Guang-zhi 《中国农业科学(英文版)》2006,5(1):1-14

Classical swine fever （CSF）, a list A disease of Office International des Epizooties, is caused by classical swine fever virus （CSFV） belonging to the Flaviviridae family. The well-known lapinized Chinese strain of CSFV, also known as C-strain, was developed in China in the mid-1950s. In the past half a century, the vaccine has been proved to be safe and immunogenic in pigs of essentially any age. It is of high efficacy, providing immunized animals with broad-spectrum, sometimes lifelong, protection, which is contributed by both cell-mediated immunity and humoral immunity, against essentially all genotypes or subgenotypes of the virus. The maternal antibodies derived from immunized sows can confer solid protection of their offspring from disease; however, they have been proved to inhibit the successful active immunization of C-strain vaccine. The complete genomes of C-strain and dozens of established or field strains have been sequenced and annotated. Recently, the reverse genetics system of C-strain has been developed, resulting in several C- strain-derived candidate marker vaccines. Many countries manage to control or even eradicate CSF with the aid of mass vaccination with C-strain. in spite of these efforts, the eradication of the disease worldwide remains a big challenge and needs to go a long way, and provably still resorts to genetically modified C-strain vaccine. The authors present an overview of the characteristics of the vaccine, which has stood the test of half a century.  相似文献   

新城疫病毒(NDV)HN基因真核表达重组质粒的构建   总被引：6，自引：4，他引：6  

仲大莲  刘兢等 《安徽农业大学学报》2002,29(1):34-37

应用一对自行设计的引物,通过反转录-聚合酶链反应(RT-PCR)获得新城疫病毒(NDV)Lasota株的血凝素神经氨酸酶(HN)基因片段,其长度约为1.7 kb,与已报道的NDV-HN基因片段大小一致.再将该HN基因片段定向插入真核表达质粒pcDNA3中,经酶切和测序鉴定,表明构建的重组质粒含有NDV-HN基因片段.  相似文献   

马铃薯Y病毒两分离物特性及其侵染寄主的超微结构比较研究   总被引：8，自引：0，他引：8       下载免费PDF全文

郭兴启  李向东  王秀芳  竺晓平  温孚江 《浙江大学学报(农业与生命科学版)》2002,28(4):411-416

报道了马铃薯Y病毒两分离物的生物学和血清学特性、病毒粒体形态大小以及它们引起的寄主细胞病变特征等方面的差异.从山东省主要烟草和马铃薯种植区病毒样品中分离到两个马铃薯Y病毒分离物,分别为PVY-T 和PVY-P.两分离物在寄主植物上的症状表现、体外抗性、蚜传特性、血清学以及病毒粒体大小等方面存在着明显的差异.同时,这些结果与作对照的PVY标准株系PVYN 和PVYO相比较,初步推测分离物PVY-T属于PVYO株系 ,而P VY-P则属于PVYN.通过对受侵染寄主的细胞超微结构观察比较发现,这两种PVY分离物在寄主细胞内的分布特征、内含体以及与寄主互作后所引起的细胞病变也明显不同,这些可能成为区别PVY不同株系的依据之一.  相似文献   

农杆菌介导获得转水稻草矮病毒NS3基因水稻植株     

林丽明  吴祖建  林奇英  谢联辉 《福建农林大学学报(自然科学版)》2004,33(1):60-63

构建了包含水稻草矮病毒(Ricegrassystuntvirus,RGSV)NS3基因的植物表达载体pCBTNSv3,应用农杆菌介导法,将NS3基因导入水稻愈伤组织中,获得了转RGSVNS3的水稻转基因植株,总DNA经PCR、Southern点杂交鉴定,初步证实NS3基因已整合到水稻基因组中.  相似文献   

兔出血症的研究     

霍澍田  申之义  辛盛鹏  韩国仁 《内蒙古农业大学学报(自然科学版)》1992,(2)

从呼和浩特市郊区分离1株兔出血症病毒,命名NM株,对其进行了病毒理化、生物学特性检测,并研究了应用SPA协同凝集试验诊断兔出血症的方法。结果表明,病毒在兔体连续传6代,均出现典型症状及病理变化,是1株毒力稳定的强毒株,病毒粒子在电镜下呈球形,直径30.3nm,无囊膜,边缘有均匀排列的齿状突起,有实芯(占40.6％)和空芯(占59.4％)2种病毒粒子。还有少量形态不一、大小不等的类似病毒的粒子。用冷酚法提取的病毒核酸,经二苯胺显色及紫外扫描,证明为DNA。病毒的蔗糖浮密度为1.192g/ml,对氯仿、乙醚及胰蛋白酶不敏感,耐酸(pH5、pH3)耐热(50℃、56℃、60min)。病毒对人的各型红细胞有高度凝集性。经氯仿、乙醚、酸(pHs、pH3),热(50℃、56℃ 60min)处理后血凝价不降或稍降,经胰蛋白酶处理后血凝价明显降低(降5个滴度)。37℃放置4h,4℃冰箱放置48h血凝价不降,4℃放置4～13d降低一个滴度,15d降2个滴度。兔体血清HI抗体滴度与保护力呈正相关,1∶40以上可以完全抵抗强毒攻击。用内蒙古生物制药厂生产的兔出血症组织灭活苗免疫兔,可以抵抗强毒的攻击。采用原代乳兔肾细胞、Vero及BHK_(21)传代细胞,培养病毒均未成功。应用SPA协同凝集试验诊断兔出血症,特异性和可靠性均好,可作为本病的1种快速诊断方法。  相似文献   

大麦黄矮病毒外壳蛋白基因和运动蛋白基因酵母表达载体的构建     

石海英 《沈阳农业大学学报》2005,36(4):448-450

根据已知的大麦黄矮病毒GPV株系的外壳蛋白（Coat Protein CP）和移动蛋白（Movement Protein MP）基因序列合成了CP、MP基因的上下游引物。通过PCR扩增获得含有目的基因的片段，经过SalⅠ和PstⅠ双酶切、连接、转化、重组质粒的酶切鉴定及基因测序，构建了酵母表达载体pGBKT7-GPV-CP和pGBKT7-GPV-MP，用于在酵母双杂交分析中表达诱饵融合蛋白，为进一步筛选小麦cDNA文库内与大麦黄矮病毒互作的寄主因子、克隆寄主因子、推测其种类和功能奠定了基础。  相似文献