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Papaya Ringspot Virus Resistance of Transgenic Rainbow and SunUp is Affected by Gene Dosage, Plant Development, and Coat Protein Homology 总被引：7，自引：0，他引：7
Paula Tennant G. Fermin M.M. Fitch R.M. Manshardt J.L. Slightom D. Gonsalves 《European journal of plant pathology / European Foundation for Plant Pathology》2001,107(6):645-653
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Savarni Tripathi Huey-jiunn Bau Li-fang Chen Shyi-dong Yeh 《European journal of plant pathology / European Foundation for Plant Pathology》2004,110(9):871-882
The coat protein (CP) gene mediated transgenic resistance is found to be the best approach for protecting papaya plants against the destructive disease caused by Papaya ringspot viruses(PRSV). In order to study the variability of PRSV and the potential threat to the CP-transgenic resistance, five virus isolates were collected from transgenic plants of papaya line 16-0-1, which carry the CP gene of the typical mosaic strain of Taiwan PRSV YK, in an approved test field and fourteen from untransformed papaya plants in different areas of Taiwan. The results of biological, serological, and molecular characterization indicated that all isolates are related to PRSV YK. Among them, the isolate 5--19 from the transgenic line and the isolates CS and TD2 from untransformed papaya were able to overcome the YK CP gene-mediated resistance of papaya lines 18--2--4, 17-0-5, and 16-0-1, which provide high degrees of resistance to different geographic PRSV strains of Hawaii (HA), Mexico (MX), and Thailand (TH). These three isolates were also able to cause symptoms on untransformed papaya plants more severe than those induced by YK. In addition to the host reactions, the variability of the collected 19 isolates was also analyzed and compared with YK and other geographic strains by heteroduplex mobility assay (HMA) and sequence analyses. The results of HMA indicated that the CP genes of isolates 5--19 and TD2 are more divergent than those of other isolates when compared with YK. However, sequence analyses of the transgenic-resistance overcoming isolates 5-19, CS, and TD2 revealed that their CP coding regions and the 3 untranslated regions (UTRs) share nucleotide identities of 93.9–96.6% and 94.2–97.9% with those of YK, respectively; whereas the other geographic strains of HA, MX, and TH that could not overcome the transgenic resistance share lower nucleotide identities of 89.8–92.6% and 92.3–95.3% with those of YK, respectively. Our results indicate that the ability for overcoming the transgenic resistance is not solely correlated with higher degrees of sequence divergence from the transgene. The possible mechanism for overcoming the transgenic resistance and the potential threat of these PRSV strains to the application of the transgenic papaya lines carrying PRSV YK CP gene are discussed. 相似文献
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ABSTRACT The role of the pepper huasteco virus (PHV) coat protein (CP) gene during the infection was investigated in three different hosts by using mutations that produced truncated proteins and by complementation assays in transgenic plants. The infectivity analysis revealed that mutants that express truncated CP (CP7 and CP191) behave like the wild-type virus when inoculated onto pepper and Nicotiana benthamiana plants in terms of symptom expression and viral DNA movement. On the contrary, the CP7 mutant was unable to systemically infect tobacco plants, whereas only 10% of the plants inoculated with the CP191 mutant became infected. The CP7 mutant was complemented by coinoculating it with another geminivirus (taino tomato mottle virus). No complementation was observed in plants from nine transgenic tobacco lines expressing CP under the control of the cauliflower mosaic virus (CaMV) 35S promoter. However, 3 out of 10 lines expressing CP under the control of its own promoter (693 nucleotides) were able to complement the CP7 mutant. Interestingly, upon infection, the levels of CP mRNA in 693CP plants increased dramatically, probably due to transactivation of the CP promoter by the viral protein AC2. 相似文献
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西瓜花叶病毒2号新疆昌吉分离物外壳蛋白基因核苷酸序列分析 总被引：6，自引：1，他引：5
利用RT-PCR从新疆昌吉地区表现花叶、疱斑、扭曲等症状的南瓜病株上检测到西瓜花叶病毒2号新疆昌吉分离物(简称WMV-2-XJ-CJ),并测定了该分离物外壳蛋白(CP)基因序列。序列分析表明,新疆昌吉分离物CP基因全长850个核苷酸,编码197个氨基酸。与国内外报道的12个WMV-2CP基因相比,其核苷酸序列同源性为92.6%~98.3%,由此推导的氨基酸序列同源性为94.7%~99.3%。新疆昌吉分离物在CP N'端可变区明显不同于国内外报道的核苷酸序列。WMV-2新疆昌吉分离物与日本和郑州分离物较其它国家和地区的分离物多出6个核苷酸,但其核苷酸及其推导的氨基酸序列差异较大。新疆昌吉分离物外壳蛋白有2个氨基酸残基明显不同于其它分离物,其中蚜传株系的特征结构域DAG突变为DAE。 相似文献
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ABSTRACT Papaya ringspot virus (PRSV) is a major limiting factor for cultivation of papaya (Carica papaya) in tropical and subtropical areas throughout the world. Although the coat protein (CP) gene of PRSV has been transferred into papaya by particle bombardment and transgenic lines with high resistance to Hawaii strains have been obtained, they are susceptible to PRSV isolates outside of Hawaii. This strain-specific resistance limits the application of the transgenic lines in other areas of the world. In this investigation, the CP gene of a local strain isolated from Taiwan, designated PRSV YK, was transferred into papaya via Agrobacterium-mediated transformation. A total of 45 putative transgenic lines were obtained and the presence of the transgene in papaya was confirmed by polymerase chain reaction amplification. When the plants of transgenic lines were challenged with PRSV YK by mechanical inoculation, they showed different levels of resistance ranging from delay of symptom development to complete immunity. Molecular analysis of nine selected lines that exhibited different levels of resistance revealed that the expression level of the transgene is negatively correlated with the degree of resistance, suggesting that the resistance is manifested by a RNA-mediated mechanism. The segregation analysis showed that the transgene in the immune line 18-0-9 has an inheritance of two dominant loci and the other four highly resistant lines have a single dominant locus. Seven selected lines were tested further for resistance to three PRSV heterologous strains that originated in Hawaii, Thailand, and Mexico. Six of the seven lines showed varying degrees of resistance to the heterologous strains, and one line, 19-0-1, was immune not only to the homologous YK strain but also to the three heterologous strains. Thus, these CP-transgenic papaya lines with broad-spectrum resistance have great potential for use in Taiwan and other geographic areas to control PRSV. 相似文献
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西瓜花叶病毒2号南瓜分离物的鉴定及其外壳蛋白基因序列分析 总被引：5，自引：1，他引：5
利用电镜和酶联免疫吸附测定法(ELISA)在黑龙江省采集的南瓜病样中检测到西瓜花叶病毒2号(WMV-2)。再利用免疫PCR (IC-PCR)和反转录PCR (RT-PCR)方法,扩增获得其外壳蛋白(CP)基因片段,并克隆到pGEM-T载体中。核苷酸序列测定表明,该分离物CP基因全长为852个核苷酸,编码由284个氨基酸组成的31.8 kDa蛋白。与国外已报道的WMV-2 CP基因相比,其核苷酸序列同源性为92.2%~94.0%,由此推导的氨基酸序列同源性为94.5%~98.1%。与国内2个分离物相比,和山西分离物核苷酸和氨基酸的同源性都达到98.5%,和郑州分离物核苷酸和氨基酸的同源性分别为91.5%和95.0%。 相似文献
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ABSTRACT A comparative study was made on the host reactions, serological properties, and nucleotide sequences of the coat protein (CP) gene of 10 clover yellow vein virus (C1YVV) isolates and one bean yellow mosaic virus (BYMV) isolate collected from different host plant species and locations in Japan. Two strains of C1YVV isolates, grouped on the basis of host reactions on Chenopodium amaranticolor, C. quinoa, Nicotianaclevelandii, N. benthamiana, Vicia faba, and Trifolium repens, corresponded to two serotypes determined by double-antibody sandwich- and triple-antibody sandwich-enzyme-linked immunosorbent assay using three polyclonal and nine monoclonal antibodies. These results were also confirmed by nucleotide sequence analysis of the CP gene. The CP gene of C1YVV isolates of strain 1, including the Australian isolate C1YVV-B, had 93 to 98% nucleotide identities and 97 to 99.6% amino acid identities. The CP of C1YVV isolates of strain 2, including the New Zealand isolate C1YVV-NZ, had 92 to 98% nucleotide identities and 95 to 98% amino acid identities. The nucleotide identities and the amino acid identities between the two C1YVV strains were 82 to 84%, and 90 to 94%, respectively. When compared with the CP sequences of 12 C1YVV isolates, the CP sequence of the BYMV isolate had 71 to 73% nucleotide identity and 73 to 77% amino acid identity. Amino acid sequence differences among C1YVV isolates from strains 1 and 2 were located mostly at the N-terminal regions of the CP. Our results indicated that the C1YVV isolates studied could be separated into two strains on the basis of host reactions, serology, and the nucleotide sequence of the CP gene. 相似文献
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甘薯潜隐病毒外壳蛋白基因的克隆、表达及其抗血清的制备 总被引：2，自引：0，他引：2
根据已报道的甘薯潜隐病毒(Sweet potato latent virus,SPLV)外壳蛋白(CP)基因的核苷酸序列合成引物,利用RT-PCR方法克隆了SPLV河南分离物(SPLV-HN)的CP基因及部分3'端非编码区序列,序列分析表明,SPLV-HN CP基因由879个核苷酸组成(GenBank登录号为DQ399862),编码293个氨基酸残基。与GenBank中SPLV-CH(X84011)和SPLV-T(X84012)分离物的核苷酸序列相似性分别为96.8%和93.0%;与日本分离物(E15420)的核苷酸序列相似性为83.6%。将CP基因克隆到原核表达载体pET-30a(+)上,SDS-PAGE分析表明,经IPTG诱导,CP基因在大肠杆菌BL21(DE3)pLysS中得到了高效表达。以表达的蛋白为抗原,免疫家兔,制备了SPLV外壳蛋白的特异性抗血清。ACP-ELISA检测结果表明,制备的抗血清可用于田间甘薯样品的检测。 相似文献
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S. Radian-Sade A. Perl Orit Edelbaum Larissa Kuznetsova R. Gafny I. Sela Edna Tanne 《Phytoparasitica》2000,28(1):79-86
As part of a project to construct virus-resistant transgenic grapevines, grapevine virus A (GVA) coat protein (CP) sequences
were introduced into grapevine and the model plantNicotiana benthamiana. The engineered constructs were tested for their ability to engender resistance inN. benthamiana. A number of GVA-CP-transformedN. benthamiana lines have become resistant to GVA. Preliminary biological and molecular analyses strongly suggest that in most cases the
obtained resistance is RNA-mediated. Several lines of transgenic grapevine were obtained. 相似文献
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甘薯羽状斑驳病毒外壳蛋白基因的分子变异 总被引：4，自引：0，他引：4
应用单链构象多态性(single-strand conformation polymorphism,SSCP)技术结合核苷酸序列测定的方法,对我国甘薯主产区11个省份的甘薯羽状斑驳病毒(Sweet potato feathery mottle virus,SPFMV)外壳蛋白(CP)基因的分子变异情况进行了研究.结果表明,SPFMV CP基因的RT-PCR产物表现了较丰富的图谱类型,50个分离物共产生9种主要的SSCP带型;对显示不同带型的20个样品的CP基因进行了序列测定和进化树分析,CP基因核苷酸序列一致性为77.2％～99.9％.说明这些样品的SPFMV的CP基因存在较大的分子变异,可划分为EA、RC、O和C4个株系. 相似文献
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小西葫芦黄花叶病毒外壳蛋白基因的克隆及序列分析 总被引：8，自引：2，他引：8
以小西葫芦黄花叶病毒(Zucchini yellow mosaic virus,ZYMV)的中国分离物(CH-87)接种发病的叶片中提取的总RNA为模板,经RT-PCR扩增获得ZYMV CP基因,将其克隆到pUCm-T质粒上进行序列分析。结果表明该CP基因由837个核苷酸组成,编码279个氨基酸。与已发表序列相比较,该CP基因与国际上已报道的4个基因型不同,应属于新的基因型,暂命名为基因型Ⅴ。 相似文献
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甘薯脉花叶病毒外壳蛋白基因在大肠杆菌中的表达及其抗血清的制备 总被引：1，自引：1，他引：0
根据已报道的甘薯脉花叶病毒(Sweet potato vein mosaic virus,SPVMV)外壳蛋白（CP）基因的核苷酸序列合成引物,利用RT-PCR方法克隆了SPVMV河南分离物（SPVMV-HN）基因组3′端1.8 kb的基因片段,包括部分NIb 基因序列和完整的CP基因及3′端非编码区序列(3′UTR)。序列分析表明,SPVMV-HN的CP基因由996个核苷酸组成（GenBank登录号为FJ687211）,编码332个氨基酸残基。与已发表的SPVMV其他分离物相比,其推导的氨基酸序列一致性为95.2%～98.5%,与 SPVMV广东分离物的氨基酸序列一致性为97.9%。将CP基因克隆到原核表达载体pET-28a（+）上,SDS-PAGE分析表明,经IPTG诱导,CP基因在大肠杆菌BL21(DE3) pLysS中得到了高效表达。以表达的蛋白为抗原,免疫家兔,制备了SPVMV外壳蛋白的特异性抗血清。ACP-ELISA检测结果表明,制备的抗血清可用于田间甘薯样品的检测。利用SPVMV的抗血清,对采自全国14个省（市）的田间甘薯样品以及嫁接的巴西牵牛样品进行了检测,结果表明,SPVMV在我国甘薯上普遍存在。 相似文献
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百合斑驳病毒云南分离物 全基因组序列分析及CP结构预测 总被引：1，自引：0，他引：1
对云南嵩明百合上发生的百合斑驳病毒(Lily mottle virus, LMoV)进行全基因组序列测定及分析,并对LMoV嵩明分离物(LMoV-SMi1、LMoV-SMi2)和玉溪分离物(LMoV-YXi1、LMoV-YXi2)外壳蛋白(coat protein,CP)基因进行序列比较,发现云南的LMoV分为2个类群,玉溪分离物属于种群I,嵩明分离物属于种群II。2个类群间的核苷酸和氨基酸同源性分别为86.7%~89.5%、90.1%~92.7%,玉溪分离物和嵩明分离物相比,cp基因发生了3个核苷酸的缺失。对国内外LMoV所有分离物的cp基因氨基酸序列进行系统进化分析,结果表明所有LMoV分离物可划分为2个种群,种群I分离物较种群II分离物几乎均存在1个苏氨酸缺失的差异。此外,对LMoV-SMi2的CP相关特性和空间结构进行了初步预测,认为该蛋白为球状,具有较强的表面可能性,不存在跨膜区域,大多数区域能够形成主要的抗原决定簇,主要集中在aa12-22、aa31-42、aa83-99、aa179-191、aa215-223、aa249-259区段,可作为制备抗血清选择抗原的参考。LMoV-SMi2和LMoV-YXi1在二级结构和三级结构上存在一定的差异,但总体空间结构差异不大。 相似文献
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瓜类褪绿黄化病毒(cucurbit chlorotic yellows virus, CCYV)是近些年来出现的一种烟粉虱 Bemisia tabaci传播的植物病毒,在瓜类生产中造成了严重损失。为了解该病毒外壳蛋白(coat protein, CP)在病毒侵染寄主过程中的亚细胞定位和致病作用,本研究以CCYV山东黄瓜分离物为研究对象,构建了荧光表达载体CP-YFP和异源表达载体pGR-CP。浸润荧光表达载体48 h后的本氏烟Nicotiana benthamiana叶片在激光共聚焦显微镜下可以观察到荧光信号在细胞质和细胞核内均有分布;浸润异源表达载体的本氏烟植株7 d后上部叶片开始显现花叶症状,13 d后顶部新叶出现严重皱缩和坏死斑点。以上结果表明CCYV CP蛋白参与了病毒对寄主的侵染过程,可能是症状形成的致病相关因子。本研究为进一步解析该病毒的致病机理提供了初步的理论支持。 相似文献
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利用RNAi 介导的抗病性获得抗2 种花生病毒的转基因烟草 总被引：1，自引：0，他引：1
分别以花生条纹病毒红安株系(PStV-Hongan)外壳蛋白基因(CP),花生矮化病毒轻型株系(PSV-Mi)和花生黄瓜花叶病毒(CMV-CA)复制酶基因2a为模板,通过PCR 方法分别得到PStV-CP 5′ 端,PSV-Mi 和CMV-CA 2a3′ 端150 bp 的片段,3 种片段混合物为模板经PCR 拼接得到450 bp 的片段,此拼接片段通过Gateway 系统重组至植物表达载体pK7GW1WG2,得到含反向重复拼接片段的植物表达载体pK450。冻融法导入根癌农杆菌(Agrobacterium tumefaciens)菌株GV3101 后,叶盘法转化本生烟(Nicotiana benthamiana),经PCR 检测,获得转基因植株。对T1 代转基因植株分别人工接种3 种病毒,66. 7% 的植株表现对PStV 免疫,9% 的植株表现对CMV-CA 的恢复抗性,全部植株对PSV 感病。siRNA 的Northern blot 结果表明,所有转基因烟草植株都含有病毒特异siRNA,siRNA 含量随接种后时间延长而衰减。 相似文献