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Cauliflower mosaic virus

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498:(JA)-dependent signaling, and is most closely associated with crosstalk between the two. Modification of NPR1 serves to inhibit plant cells’ defensive responses by preventing SA-dependent signaling; modified NPR1 can properly traffic to the nucleus and bind the PR-1 promoter, but is unable to initiate transcription. Because active NPR1 is required for accumulation of SA, this leads to a further depletion of SA. Whereas regulation of SA-dependent signaling by P6-modified NPR1 is localized to the nucleus, regulation of JA-dependent signaling is cytoplasmic in nature and involves the COI1 pathway. In contrast to that of SA, JA-dependent signaling is increased in the presence of modified NPR1. 507: 357:. It causes high levels of gene expression in dicot plants. However, it is less effective in monocots, especially in cereals. The differences in behavior are probably due to differences in quality and/or quantity of regulatory factors. Recent study has indicated that the CaMV 35S promoter is also functional in some animal cells, although the promoter elements used are different from those in plants. While this promoter had low activity compared to canonical animal promoters, levels of reporter products were significant. This observation suggests that the 35S promoter may have potential for use in animals. 35: 618: 380: 207: 635:
for the production of factors involved in viral counter-defense. A number of hosts of CaMV possess small RNA-based viral silencing mechanisms that serve to limit viral infection. The products of the aforementioned 600-bp sequence are viral small RNAs (vsRNA) of 21, 22, and 24 nucleotides in length that serve as decoys, binding and inactivating effectors of host silencing machinery, such as Argonaute 1 (
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protein P2 and P3 are first produced in numerous viral factories (electron-dense inclusion bodies), and are later exported and co-localize with microtubules, before concentrating in ELIB. CaMV specifically uses the microtubules to form the transmissible body and thus enable vector transmission. The complete molecular characterization and study of this virus was not carried further.
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strand of DNA reaches the 5′ end of the new β strand, it displaces the primer and some of the newly synthesized β strand, resulting in the recreation of discontinuity 2 (D2). When the new β strand of DNA reaches the 5′ end of the new γ strand, it displaces the primer and some of the newly synthesized γ strand, resulting in the recreation of discontinuity 3 (D3).
483:, P6 has been shown to interact with a number of other CaMV proteins, such as P2 and P3, suggesting that it may also contribute in some degree to viral assembly and aphid-mediated transmission. In addition, P6 has been shown to bind to P7; investigating interactions between the two may help to elucidate the as yet unknown function of P7. 601:
a result, only these two genes can be replaced/deleted without a loss of infectivity. In addition, modified CaMV genomes exceeding the natural genome size (8024 bp) by even a few hundred bp are not packaged into virions. These two factors seriously limit the size of DNA insert clonable in CaMV. The bacterial dihydrofolate reductase
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The virus is acquired from an infected host during feeding by the aphid vector. To occur, a transmissible complex is composed of virions and protein P2 located in the vector's stylets. The P2 N-terminal domain recognizes a protein receptor located at the tip of the stylet and the P2 C-terminal domain
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CaMV contains about 8 kb double-strand DNA genome and produces spherical particles. CaMV infections are systemic, and even its DNA is infectious when inoculated on abraded plant surfaces. The CaMV genome has 8 tightly packed genes, of which only two small genes, genes II and VII, are nonessential; as
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In the early 2010s, some concerns have been raised about using the CaMV 35S promoter for expression in transgenic plants because sequence overlap exists between this promoter and the coding sequences of P6. Fifty four transgenic events certified for release in the USA contain up to 528 bp of ORF VI
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This leader is followed by seven tightly arranged, longer ORFs that encode all the viral proteins. The mechanism of expression of these proteins is unique, in that the ORF VI protein (encoded by the 19S RNA) controls translation reinitiation of major open reading frames on the polycistronic 35S RNA,
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in the transgenic organisms. Recent studies have attempted to determine what length of CaMV 35S promoter has the least chance of inadvertently producing P6 domains, while still retaining full promoter activity. As one might expect, using shorter promoter lengths decreases the number of P6 domains
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Cauliflower mosaic virus possesses a number of mechanisms that allow it to counteract host plant cell defenses. While the pregenomic 35S RNA is responsible for genome replication by reverse transcriptase, it also contains a non-coding 600 base pair leader sequence that serves as an important mRNA
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RNase H activity exposes purine-rich regions at the position of discontinuity 2 (D2), which primes the synthesis of the β DNA strand. When the new γ strand of DNA reaches the 5′ end of the new α strand it switches to the 5′ end of the new α strand, recreating discontinuity 1 (D1). When the new γ
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The mode of acquisition by the vector is controlled by the tissue and intracellular-specific localization of P2. This protein is only found in epidermis and parenchyma cells. Moreover, in these cells, P2 is localized in single viral electron-lucent inclusion bodies (ELIB). In host cells, viral
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The cauliflower mosaic virus promoter (CaMV 35S) is used in most transgenic crops to activate foreign genes which have been artificially inserted into the host plant. It is inserted into transgenic plants in a form which is different from that found when it is present in its natural
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Viral particles enter a plant cell and are unencapsidated. At this stage the viral DNA consists of three fragments, one on the – strand (α) and two on the + strand (β and γ) which are imperfectly assembled into a circular genome with three gaps or discontinuities (D1, D2, and
506: 298:. CaMV induces a variety of systemic symptoms such as mosaic, necrotic lesions on leaf surfaces, stunted growth, and deformation of the overall plant structure. The symptoms exhibited vary depending on the viral strain, host ecotype, and environmental conditions. 330:
CaMV contains a circular double-stranded DNA molecule of about 8.0 kilobases, interrupted by nicks that result from the actions of RNAse H during reverse transcription. These nicks come from the Met-tRNA, and two RNA primers used in reverse transcription. After
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of the viral transcript, whose expression is naturally driven by this promoter, is 35S. It is one of the most widely used, general-purpose constitutive promoters. It was discovered at the beginning of the 1980s, by Chua and collaborators at The
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transcribes from the 35S promoter all the way around the viral genome, surpassing the 35S promoter. (This creates two copies of the 35S promoter in the resulting RNA.) Transcription also initiates at the 19S promoter (not
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Hemmings-Mieszczak, M.; Steger, G.; Hohn, T. (Apr 1997). "Alternative structures of the cauliflower mosaic virus 35 S RNA leader: implications for viral expression and replication".
671:"Virus taxonomy--1999. The universal system of virus taxonomy, updated to include the new proposals ratified by the International Committee on Taxonomy of Viruses during 1998" 335:
the host cell, these single stranded "nicks" in the viral DNA are repaired, forming a supercoiled molecule that binds to histones. This DNA is transcribed into a full length,
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This new DNA binds the 35S promoter at the 3′ end of the RNA template and synthesis of the α strand of DNA continues and RNase H continues to degrade RNA complexed to DNA.
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Synthesis of the α strand completes. RNase H activity exposes purine-rich regions at the position of discontinuity 3 (D3), which primes the synthesis of the γ DNA strand.
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with a diameter of 52 nm built from 420 capsid protein (CP) subunits arranged with a triangulation T = 7, which surrounds a solvent-filled central cavity.
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of the 35S RNA is a very strong constitutive promoter responsible for the transcription of the whole CaMV genome. It is well known for its use in
1706: 1064:"Forced evolution reveals the importance of short open reading frame A and secondary structure in the cauliflower mosaic virus 35S RNA leader" 1719: 1485:
Blevins, T.; Rajeswaran, R.; Aregger, M.; Borah, BK.; Schepetilnikov, M.; Baerlocher, L.; Farinelli, L.; Meins, F.; et al. (Jul 2011).
1757: 1586: 1693: 639:). As proof-of-principle, experimental overexpression of these vsRNAs allows for increased viral accumulation in infected plants. 1487:"Massive production of small RNAs from a non-coding region of Cauliflower mosaic virus in plant defense and viral counter-defense" 372:
The 35S RNA is particularly complex, containing a highly structured 600 nucleotide long leader sequence with six to eight short
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plant hosts. This enables it to operate in a wide range of host-organism environments which would otherwise not be possible.
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gene has been successfully cloned into the CaMV genome, in place of gene II, and has been successfully expressed in plants.
1645: 1438:"A role for plant microtubules in the formation of transmission-specific inclusion bodies of Cauliflower mosaic virus" 735: 1724: 1246:"Cauliflower mosaic virus protein P6 inhibits signaling responses to salicylic acid and regulates innate immunity" 971:"Transient expression in mammalian cells of transgenes transcribed from the Cauliflower mosaic virus 35S promoter" 1340:"Structural insights into the molecular mechanisms of cauliflower mosaic virus transmission by its insect vector" 510:
A diagram depicting the steps in the genome replication of Cauliflower Mosaic Virus (CaMV). DNA is depicted in
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Love, AJ.; Geri, C.; Laird, J.; Carr, C.; Yun, BW.; Loake, GJ.; Tada, Y.; Sadanandom, A.; Milner, JJ. (2012).
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The 3′ end of a tRNA anneals to a site corresponding to discontinuity 1 (D1) near the 5′ end of the 35S RNA.
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Pararetroviruses and retroviruses: a comparative review of viral structure and gene expression strategies
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Fütterer, J.; Gordon, K.; Bonneville, JM.; Sanfaçon, H.; Pisan, B.; Penswick, J.; Hohn, T. (Sep 1988).
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a process that normally only happens on bacterial mRNAs. TAV function depends on its association with
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The tRNA primes synthesis, by the viral reverse transcriptase (encoded by ORF V), of a new α strand.
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Hoh, F.; Uzest, M.; Drucker, M.; Plisson-Chastang, C.; Bron, P.; Blanc, S.; Dumas, C. (May 2010).
1747: 1711: 1607: 1015:"The leading sequence of caulimovirus large RNA can be folded into a large stem-loop structure" 649: 534:
where the discontinuities are filled in. At this point the viral DNA also associates with host
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Another function of P6 involves modification of host NON-EXPRESSOR OF PATHOGENESIS RELATED 1 (
943: 282:(such as cauliflower and turnip) but some CaMV strains (D4 and W260) are also able to infect 183: 1594: 1667: 1257: 781:"Evaluation of the minimal replication time of Cauliflower mosaic virus in different hosts" 337: 29: 1436:
Martinière, A.; Gargani, D.; Uzest, M.; Lautredou, N.; Blanc, S.; Drucker, M. (Apr 2009).
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Laliberté, JF.; Sanfaçon, H. (2010). "Cellular remodeling during plant virus infection".
247:(all of which instead have an RNA genome replicated via a DNA intermediate) in the order 1316: 1261: 1511: 1486: 1462: 1437: 1413: 1388: 1364: 1339: 1280: 1245: 1221: 1196: 1177: 885: 860: 753: 695: 670: 373: 350: 1164: 1147: 1088: 1063: 1039: 1014: 727: 1654: 1560: 1516: 1467: 1453: 1418: 1369: 1320: 1285: 1226: 1169: 1128: 1093: 1044: 995: 931: 926: 909: 890: 876: 841: 802: 741: 731: 700: 354: 1181: 1079: 1550: 1506: 1498: 1457: 1449: 1408: 1400: 1359: 1351: 1312: 1275: 1265: 1216: 1212: 1208: 1159: 1148:"A plant viral reinitiation factor interacts with the host translational machinery" 1120: 1083: 1075: 1034: 1026: 985: 921: 880: 872: 833: 792: 723: 690: 682: 584: 480: 312: 1659: 1270: 479:
In addition to its functions regarding translational activation and formation of
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Tepfer, M.; Gaubert, S.; Leroux-Coyau, M.; Prince, S.; Houdebine, LM. (2004).
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Park, HS.; Himmelbach, A.; Browning, KS.; Hohn, T.; Ryabova, LA. (Sep 2001).
1030: 495: 265: 237: 225: 1389:"Aphid transmission of cauliflower mosaic virus: the role of the host plant" 617: 608: 451:): inclusion body Formation/trafficking; possibly other functions (see text) 1564: 1520: 1471: 1422: 1373: 1324: 1289: 1230: 1173: 1124: 999: 935: 845: 806: 704: 531: 279: 259:, despite having a DNA genome replicated via an RNA intermediate (like the 249: 164: 131: 107: 1132: 1097: 1048: 990: 894: 745: 686: 379: 1639: 1502: 1404: 1355: 462: 456: 447: 438: 429: 420: 411: 402: 332: 324: 301:
CaMV is transmitted in a non-circulatory manner by aphid species such as
231: 1698: 1555: 1538: 861:"Cauliflower mosaic virus: a 420 subunit (T = 7), multilayer structure" 393: 308: 283: 243: 187: 360:
The promoter was named CaMV 35S promoter ("35S promoter") because the
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Haas, M.; Bureau, M.; Geldreich, A.; Yot, P.; Keller, M. (Nov 2002).
550: 490:) during the course of infection. NPR1 is an important regulator of 294: 59: 1601: 1685: 1624: 820:
Brault, V.; Uzest, M.; Monsion, B.; Jacquot, E.; Blanc, S. (2010).
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ORF VII/VIII – unknown (appears note to be required for infection,
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included and also decreases the likelihood of unwanted effects.
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removes the RNA from the DNA–RNA duplex, leaving behind the DNA.
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At this point the new viral genome can either be packaged into
288: 263:), are more distantly related, belonging to the separate order 217:
The cauliflower mosaic virus (CaMV) is a member of the family
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Concerns about use of CaMV 35S promoter in transgenic plants
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Khelifa, M.; Massé, D.; Blanc, S.; Drucker, M. (Jan 2010).
722:. Advances in Virus Research. Vol. 44. pp. 1–67. 636: 602: 487: 470: 1386: 1145: 442:): protease, bifunctional reverse transcriptase and RNaseH 819: 609:
Molecular mechanisms of vector-mediated CaMV transmission
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and released from the cell or they can be transported by
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Martinière, A.; Zancarini, A.; Drucker, M. (Jun 2009).
1104: 907: 717: 1061: 1302: 1243: 1194: 1062:Pooggin, MM.; Hohn, T.; FĂĽtterer, J. (May 1998). 1739: 1536: 1429: 1380: 718:Rothnie, HM.; Chapdelaine, Y.; Hohn, T. (1994). 1195:Lutz, L.; Raikhy, G.; Leisner, SM. (Dec 2012). 859:Cheng, RH.; Olson, NH.; Baker, TS. (Feb 1992). 858: 822:"Aphids as transport devices for plant viruses" 424:): structural protein, DNA-binding capabilities 409:ORF II – P2: aphid/insect transmission factor ( 1296: 418:ORF III – P3: virion-associated protein (VAP, 910:"Cauliflower mosaic virus: still in the news" 1478: 1006: 629: 514:and RNA (including the tRNA) is depicted in 307:. Once introduced within a plant host cell, 1532: 1530: 1055: 772: 711: 662: 269:(both orders belong to the same class, the 223:. This family is grouped together with the 522:CaMV replicates by reverse transcription: 1554: 1510: 1461: 1412: 1363: 1279: 1269: 1237: 1220: 1188: 1163: 1139: 1087: 1038: 989: 925: 884: 852: 796: 694: 445:ORF VI – P6: transactivator/viroplasmin ( 278:CaMV infects mostly plants of the family 1527: 1331: 901: 616: 378: 205: 668: 538:, forming a minichromosome (not shown). 1740: 962: 813: 168:, one of the six genera in the family 1606: 1605: 182:. Pararetroviruses replicate through 341:, 35S RNA and a subgenomic 19S RNA. 1537:Podevin, N.; du Jardin, P. (2012). 1317:10.1146/annurev-phyto-073009-114239 614:binds to the P3-decorated virions. 587:into an adjacent, uninfected cell. 13: 1758:Viral plant pathogens and diseases 549:The viral RNAs pass into the host 505: 190:, but the viral particles contain 14: 1769: 1574: 427:ORF IV – P4: capsid protein (CP, 1454:10.1111/j.1365-313X.2008.03768.x 927:10.1046/j.1364-3703.2002.00136.x 33: 1080:10.1128/JVI.72.5.4157-4169.1998 1213:10.1016/j.virusres.2012.08.017 501: 400:ORF I – P1: movement protein ( 1: 1165:10.1016/S0092-8674(01)00487-1 728:10.1016/s0065-3527(08)60327-9 656: 621:Transmissible complex of CaMV 201: 1271:10.1371/journal.pone.0047535 877:10.1016/0042-6822(92)90032-k 543:DNA-dependent RNA polymerase 362:coefficient of sedimentation 318: 7: 798:10.1016/j.virol.2009.09.032 553:where they are transcribed. 162:) is a member of the genus 10: 1774: 838:10.1016/j.crvi.2010.04.001 518:See text for more details. 1614: 630:Evasion of plant defenses 530:The viral DNA enters the 344: 28: 21: 1646:Cauliflower mosaic virus 1616:Cauliflower mosaic virus 1581:Cauliflower Mosaic Virus 826:Comptes Rendus Biologies 396:initiation factor eIF3. 323:The CaMV particle is an 156:Cauliflower mosaic virus 146:Cauliflower mosaic virus 23:Cauliflower mosaic virus 1587:"The CaMV 35S promoter" 650:unforeseen consequences 1125:10.1006/jmbi.1997.0929 1031:10.1093/nar/16.17.8377 622: 519: 384: 367:Rockefeller University 286:species of the genera 214: 978:Environ Biosafety Res 687:10.1007/s007050050515 669:Pringle, CR. (1999). 620: 509: 436:ORF V – P5: pro-pol ( 382: 209: 184:reverse transcription 1405:10.4161/psb.4.6.8712 1356:10.1128/JVI.02662-09 1305:Annu Rev Phytopathol 355:plant transformation 338:Terminally redundant 30:Virus classification 1262:2012PLoSO...747535L 991:10.1051/ebr:2004010 383:Genomic map of CaMV 374:open reading frames 315:of the plant cell. 1556:10.4161/gmcr.21406 1503:10.1093/nar/gkr119 1393:Plant Signal Behav 954:has generic name ( 623: 520: 385: 215: 1753:Crucifer diseases 1735: 1734: 1608:Taxon identifiers 1491:Nucleic Acids Res 1019:Nucleic Acids Res 585:movement proteins 473:-Met binding site 153: 152: 1765: 1728: 1727: 1715: 1714: 1702: 1701: 1689: 1688: 1676: 1675: 1663: 1662: 1650: 1649: 1648: 1635: 1634: 1633: 1603: 1602: 1598: 1593:. 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903: 868: 864: 854: 829: 825: 815: 788: 784: 774: 719: 713: 681:(2): 421–9. 678: 674: 664: 646: 633: 624: 612: 599: 592: 589: 578: 521: 485: 478: 386: 371: 359: 348: 336: 329: 322: 302: 300: 293: 287: 280:Brassicaceae 277: 270: 264: 260: 254: 250:Ortervirales 248: 244:Retroviridae 242: 236: 230: 224: 218: 216: 211: 188:retroviruses 178:that infect 174:, which are 169: 165:Caulimovirus 163: 159: 155: 154: 145: 144: 133:Caulimovirus 132: 120: 109:Ortervirales 108: 96: 84: 73:Pararnavirae 72: 60: 53: 43:(unranked): 22: 1640:Wikispecies 984:(2): 91–7. 502:Replication 469:Contains a 325:icosahedron 232:Metaviridae 194:instead of 1742:Categories 1113:J Mol Biol 675:Arch Virol 657:References 394:eukaryotic 284:Solanaceae 202:Definition 186:just like 1311:: 69–91. 1201:Virus Res 764:ignored ( 754:cite book 551:cytoplasm 541:The host 494:(SA) and 390:polysomes 319:Structure 295:Nicotiana 140:Species: 68:Kingdom: 61:Riboviria 1712:11459401 1699:10608658 1625:Wikidata 1565:22892689 1521:21378120 1472:19077170 1423:19816139 1374:20181714 1325:20337516 1290:23071821 1250:PLOS ONE 1231:22982205 1182:14384952 1174:11572778 1000:15612506 936:20569349 865:Virology 846:20541164 807:19913268 785:Virology 705:10470265 594:Brassica 536:histones 376:(ORFs). 351:promoter 333:entering 116:Family: 80:Phylum: 1631:Q430416 1512:3130284 1463:2688309 1442:Plant J 1414:2688309 1365:2863735 1344:J Virol 1281:3469532 1258:Bibcode 1222:4215633 1133:9150397 1098:9557705 1068:J Virol 1049:3419922 895:1733107 886:4167691 746:7817872 696:7086988 581:capsids 563:RNase H 546:shown). 532:nucleus 309:virions 128:Genus: 104:Order: 92:Class: 1686:CAMV00 1673:541383 1563:  1519:  1509:  1470:  1460:  1421:  1411:  1372:  1362:  1323:  1288:  1278:  1229:  1219:  1180:  1172:  1131:  1096:  1089:109645 1086:  1047:  1040:338565 1037:  998:  934:  893:  883:  844:  805:  744:  734:  703:  693:  463:Q83164 457:Q83163 448:P03559 439:P03554 430:P03542 421:P03551 412:P03548 403:P03545 345:Genome 289:Datura 253:; the 241:, and 180:plants 1725:10641 1707:IRMNG 1178:S2CID 974:(PDF) 54:Realm 47:Virus 1720:NCBI 1694:GBIF 1681:EPPO 1660:RX62 1561:PMID 1517:PMID 1468:PMID 1419:PMID 1370:PMID 1321:PMID 1286:PMID 1227:PMID 1170:PMID 1152:Cell 1129:PMID 1094:PMID 1045:PMID 996:PMID 956:help 932:PMID 891:PMID 842:PMID 803:PMID 766:help 742:PMID 732:ISBN 701:PMID 637:AGO1 603:DHFR 527:D3). 512:blue 488:NPR1 471:tRNA 392:and 349:The 292:and 160:CaMV 1668:EoL 1655:CoL 1551:doi 1507:PMC 1499:doi 1458:PMC 1450:doi 1409:PMC 1401:doi 1360:PMC 1352:doi 1313:doi 1276:PMC 1266:doi 1217:PMC 1209:doi 1205:170 1160:doi 1156:106 1121:doi 1117:267 1084:PMC 1076:doi 1035:PMC 1027:doi 986:doi 922:doi 881:PMC 873:doi 869:186 834:doi 830:333 793:doi 789:396 724:doi 691:PMC 683:doi 679:144 516:red 275:). 196:RNA 192:DNA 1744:: 1722:: 1709:: 1696:: 1683:: 1670:: 1657:: 1642:: 1627:: 1589:. 1559:. 1545:. 1541:. 1529:^ 1515:. 1505:. 1495:39 1493:. 1489:. 1466:. 1456:. 1446:58 1444:. 1440:. 1417:. 1407:. 1395:. 1391:. 1368:. 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Index

Virus classification
Edit this classification
Virus
Riboviria
Pararnavirae
Artverviricota
Revtraviricetes
Ortervirales
Caulimoviridae
Caulimovirus
Caulimovirus
Caulimoviridae
pararetroviruses
plants
reverse transcription
retroviruses
DNA
RNA

Caulimoviridae
Belpaoviridae
Metaviridae
Pseudoviridae
Retroviridae
Ortervirales
Hepadnaviridae
Blubervirales
Revtraviricetes
Brassicaceae
Solanaceae

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