WO2003004649A1 - Un método para interferir con la infección de virus en plantas - Google Patents
Un método para interferir con la infección de virus en plantas Download PDFInfo
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- WO2003004649A1 WO2003004649A1 PCT/ES2002/000319 ES0200319W WO03004649A1 WO 2003004649 A1 WO2003004649 A1 WO 2003004649A1 ES 0200319 W ES0200319 W ES 0200319W WO 03004649 A1 WO03004649 A1 WO 03004649A1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
- C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
- C12N15/8279—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance
- C12N15/8283—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance for virus resistance
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8216—Methods for controlling, regulating or enhancing expression of transgenes in plant cells
- C12N15/8218—Antisense, co-suppression, viral induced gene silencing [VIGS], post-transcriptional induced gene silencing [PTGS]
Definitions
- the present invention relates to the use of double stranded RNA molecules (hereinafter referred to as dsRNA) to specifically interfere with viral infections in plants. More particularly, the invention relates to the preparation of dsRNA molecules of determined sequence and their direct application in any plant to suppress in the treated plant, the multiplication of any virus that has sufficient sequence similarity with the dsRNA.
- dsRNA double stranded RNA molecules
- Plant viruses represent one of the most important groups of pathogens, as they cause serious economic losses in many species of agronomic interest throughout the world.
- Most known viruses that infect plants have genomes consisting of single-stranded RNA (hereinafter referred to as ssRNA) and messenger-based (hereafter referred to as mRNA) as genetic material. These genomes are relatively simple, encoding only between 4 and 10 proteins, depending on the virus group. These proteins are involved in basic aspects of the biological cycle of these pathogens, such as the process of viral RNA replication, the movement of the cell-to-cell virus or the translocation of the viral progeny through the host plant (Matthews, Plant Virology, Third Edition (San Diego, Academic Press, Inc.) (1991).
- viruses Due to the limited amount of genetic information that these pathogens contain, and the complexity of the infective process, viruses depend on the host's cellular machinery for many stages of its infection cycle. Many of these host factors are usual components of the cell's transcriptional or translational apparatus, exploited by the virus to perform an integral or regulatory function in the replication and diffusion of viral RNA in the plant (Lai, Virology 244, 1 (1993) It can be said that host and parasite are intimately intertwined and compete in the molecular mechanisms that govern their biological cycles. The success or failure of viral infections is the final consequence of how viruses and their interactions interact. hosts, that is, the defensive strategies of the plant and the response of counterattack by viruses (Carrin ton and hitham, Cu / rent Opinion m Pla ⁇ Biology 1, 336 (199S).
- RNA-mediated defense mechanism has been identified in various viral infections in plants. directed against the pathogen sequences (Baulcombe, Plant Cell 8, 1833 (1996).
- transgenic resistance derived from the pathogen typically refers to the resistance that is obtained against a particular pathogen, by the introduction, by genetic engineering, of genome sequences of said pathogen into the genome of plants (Sanford and Johnston, J Theoretical Biol. 1.13, 395 (1985) Numerous gene sequences, derived from many different plant viruses, have been introduced into a wide variety of plant species, to produce transgenic plants protected against infection by these viruses.
- RNA that identifies the sequence of both the viral RNA and the transcribed mRNA of the transgene and specifically degrades them (Lindbo et al., Plant Cell. 5, 1749 (1993); English et ai, Plant Cell 8, 179 (1996), Covey et al, Nature 386,781 (1997); Tenllado and D ⁇ az-Ru ⁇ z, Transgenic Research 8, 83 (1999); Vaucheret et al, Plant J., 16, 651 (1998); Sijen and Kooter BioEssays 22, 520 (2000).
- the determining signal is very likely to be a nucleic acid, and recently has verified the presence, in the cases studied, of small 25 nucleotide molecules of antisense RNA, which could constitute or be components of the specific systemic signal (Hamilton and Baulcombe, Science 286, 950 (1999). Another important aspect of the latter phase, it seems that it is the absolute necessity of a nuclear component with sequence similarity to the target mRNA, so that the PTGS is perpetuated in time and space (Palauqui and Balzergue, Curr. Biol. 9, 59 (1999); Dalmay et al , Plant Cell, 12, 369 (2000).
- RNAi RNA interference
- RNAi phenomena have been described in a wide variety of different organisms (Fire, Trends Genet.
- PTGS can be caused in transgenic plants very efficiently by the presence of a repeated and inverted sequence in the transcription region of the transgene (Hamilton et al, Plant J, 15,
- a first aspect of this invention is the cloning of any fragment of the genome of any virus whose multiplication in the plant cells is to be blocked.
- a second aspect of this invention is the insertion of the cloned fragment into a transcription vector, to synthesize ssRNA fragments of both polarities (sense-antisense) or complementary and mix the products of both transcripts to obtain dsRNA molecules of identical sequence to that of the genome of the virus, or very similar to that of other viruses, whose multiplication is to be prevented.
- a third aspect of this invention is the application of dsRNA molecules in some plant tissue (eg leaves, root, etc.), to interfere with the infection of the corresponding virus whose genome has sequence similarity to dsRNA.
- the novelty of this invention lies in the fact that it is the first time that the direct application of dsRNA has been described in plants to specifically interfere with and silence transient expression genes, such as virus genes, with the consequent protection of plants against the corresponding viral diseases, without having to use viral vectors or resort to the procedures of genetic transformation of plant cells.
- This invention could be used to alleviate the serious economic losses that viruses cause in many species of agronomic interest throughout the world, as well as, indirectly, to prevent the abusive use of pesticides used to control their vector insects, impacting on protection of the environment and avoiding ecological risk
- the object of this invention is the direct application of exogenous dsRNA molecules in any tissue of any plant, to specifically interfere in the cells of the plant, with the multiplication of the corresponding virus that has sequence similarity with the dsRNA.
- RNA viruses belonging to different taxonomic groups, which represent extreme examples in the evolution of RNA viruses in plants, such as the attenuated mottled pepper virus (hereinafter referred to as P MoV), the tobacco etching virus (hereinafter referred to as TEV) and the alfalfa mosaic virus (hereinafter referred to as AMV). All three viruses have RNA genomes whose complete sequence is known (Alonso et al, J. Gen. Viro !.
- P MoV the attenuated mottled pepper virus
- TEV tobacco etching virus
- AMV alfalfa mosaic virus
- Tobamovirus a group of viruses with a genomic organization formed by a single molecule of messenger sense ssRNA AMV (Neeleman et al, Virology, 181, 687 (1991) belongs to the genus Alfamovirus, within the family Bromoviridae, a group of viruses with a genomic organization formed by three messenger sense ssRNA molecules Both viruses are framed within the sydbisvirus superfamily TEV (Dolja et al, Proc. Nati Acad. Sci.
- cDNA complementary DNA
- RT-PCR polymerase chain reaction
- a fragment of 1605 bp corresponding to the complete 54K gene of PMMoV was also inserted in a sense or antisense orientation into a binary vector of expression in plants, between a high expression promoter, such as the 35S promoter of cauliflower mosaic virus (in hereinafter referred to as CaMV), and the transcriptional terminator of gene 7 of TL-DNA, and the corresponding constructs were introduced into strain LBA 4404 of the bacterium Agrobacterium tumefaciens, by known methods of direct transformation (An et al., Binary vectors. A3: 1-19 in: Plant Molecular Biology Manual SB Gelvin and RA Schilperrot, eds.
- CaMV cauliflower mosaic virus
- PCR polymerase
- cDNA molecules corresponding to the same 977 bp region of the 54K gene of PMMoV and, therefore, of the same sequence as the RNA products synthesized in vitro in the transcription reaction.
- both the sense and added ssRN'A molecules obtained from transcription /; vitro such as the dsRNA molecules obtained from the mixing and hybridization of the sense and antisense transcription products, or the cDN ⁇ molecules obtained by PCR, were applied directly to the host leaves, such as Nicotia to Benthamian plants, preferably by mechanical inoculation, together with the corresponding homologous viral inoculum, in the form of purified virus particles or as an infective RNA.
- benthamiana plants using the well-known agroinfiltration procedure (Vaucheret) , CR Acad. Sci. III 317, 310 (1994), followed by inoculation into the same infiltrated sheets of the previously mentioned PMMoV viral inoculum.
- the same result was produced by at least one procedure for applying dsRNA different from that of mechanical inoculation, when the leaves of N. benthamiana plants were treated by agroinfiltration, with the mixture of A. tumefaciens transformed with the sense and antisense constructs, whose transcription products must form // live dsRNA molecules, and subsequently the same leaves were inoculated with the homologous virus, until at least 4 days after the agroinfiltration treatment with the mixture of A. tumefaciens.
- the systemic leaves of the agroinfiltrated plants did not show viral symptoms, nor were the corresponding viral RNAs detected in the infiltrated leaves.
- sequence specificity such as the structure of dsRNA molecules
- dsRNA molecules either directly applied on the surface of a leaf, or by means of agroinfiltration, they can activate the PTGS mechanism, preventing the replication of the virus with which they have sequence similarity, at least in the treated leaves and, therefore, the procedure can be applied to defend the plants against viral infections.
- non-systemic hosts such as tobacco plants (Nicotiana tabacum cv. "Xanthi nc") or pepper plants (Capsicum ch ⁇ nense), where PMMoV only produces localized infection with symptoms of local injuries
- tobacco plants Naturala tabacum cv. "Xanthi nc”
- pepper plants Capsicum ch ⁇ nense
- PMMoV only produces localized infection with symptoms of local injuries
- dsRNA, ssRNA of both polarities, cDNA homologous to the region of the 54K gene of PMMoV, as well as dsRNA not homologous to this virus were coinoculated in half sheets of non-systemic hosts, with the virus only inoculated in the Half an opposite leaf, the formation of local lesions on the leaf surface was completely blocked only in the case of coinoculation with dsRNA, where no lesion occurred.
- RNA as a genetic material or that this originates at any stage of its infective cycle, as will be recognized by those familiar with the art of Virology.
- the invention described previously can also be used with any plant
- dsRNA angiosperm or gymnosperm, monocotyledonous or dicotyledonous
- dsRNA can be applied and in which you want to interfere with the infection of any virus with the aforementioned characteristics and are likely to be infected by these viruses, that is to say in which the virus can replicate in inoculated cells.
- the invention described previously can be carried out with any available method of direct introduction of dsRNA into plant cells, widely used by persons skilled in the art, such as mechanical inoculation, infiltration or agroinfiltration, injection, electroporation, bombardment with microparticles, in the case of not many plants, or by vaporization or fumigation procedures, in the case of large numbers of plants or crops etc.
- the place of introduction into the most appropriate dsRNA plant, without excluding another, is the leaf bundle tissue.
- the invention described above demonstrates that it is possible to specifically interfere with viral infections and that a PTGS of at least transient expression genes (eg viral genes) can be induced in plants, by direct application of sequence dsRNA molecules. Homologous and therefore, the novelty of this invention is the direct application of any molecule of dsRNA exoge ⁇ o in the tissue of any plant to protect plants against viral infections.
- the invention described previously, of direct application in cells of dsRNA plants, by any method, is different from other strategies based on the expression in tragic plants of RNAs with the ability to form dsRNA molecules, such as the protection thus obtained by PTGS against the Y virus of the potato (PVY) (Waterhouse et al, Proc. Nati Acad. Sc ⁇ .
- the invention described above can also be used to specifically silence the expression of any endogenous or transgene gene in the plant, which represents an alternative to the processes of genetic transformation of plants with constructs capable of expressing dsRNA, with a view to to specifically interfere with the expression of endogenous genes in plants (Chuang and Meyerowitz, Proc. Nati Acad. Sci. USA, 97, 4985 (2000); Levin et al, Plant Mol. Biol. 44, 759 (2000).
- chains of sense and antisense ssRNA were synthesized in vitro, from the corresponding cDNA plasmid, using the promoters of the T3 and T7 phage RNA polymerase (T3 / T7 transcription it, Roche), by described procedures (Sambrook et al, Molecular cloning: A laboratory manual, 2nd edn. Cold Spring Harbor, NY, Cold Spring Harbor Laboratory (1989).
- Synthesized ssRNA chains (2.5 ⁇ M) were mixed and hybridized by heating to 95 ° C for 3 minutes in the 25 mM sodium phosphate buffer pH 7 and subsequent cooling to 37 ° C for 30 minutes
- the formation of dsRNA molecules was confirmed by analyzing the change in their mobility in agarose gel, compared to the mobility of each of the sense and antisense ssRNA molecules, and also for its resistance to RNAse A (Roche) under conditions of high salt concentration.
- RNAse A RNAse A
- TEV-HC dsRNA For the production of dsRNA molecules derived from TEV, a fragment corresponding to positions 845-232S in the TEV sequence was subcloned (Dolja et al, Proc. Nati Acad Sci. USA, 89, 10208 (1992) (Fig. 1 ), in the pBluescript SK- (New England Biolabs) vector that resulted, after the corresponding transcription and hybridization, to the 1483-bp dsRNA fragment (hereinafter referred to as TEV-HC dsRNA).
- dsRNA molecules derived from AMV For the production of dsRNA molecules derived from AMV, a fragment corresponding to positions 369-1493 in the sequence of AMV RNA 3 was subcloned (Neeleman et al, Virology, 181, 687 (1991) (Fig. 1), in the pBluescript SK (New England Biolabs) vector that resulted, after the corresponding transcription and hybridization, to the 1 124-bp dsRNA fragment (hereinafter referred to as AMV-3 dsRNA).
- RNA 1 pUT 17A
- RNA 2 pUT27
- RNA 3 pAJL3
- Inoculation mixtures were performed by adding 5 ⁇ l of dsRNA from each virus (approximate concentration of 0.8 ⁇ g / ⁇ l, estimated by staining with ethidium bromide with markers of known weight) at an equivalent volume of purified virus (PMMoV), or at 10 ⁇ l of viral transcripts (TEV and AMV).
- PMMoV purified virus
- TMV and AMV 10 ⁇ l of viral transcripts
- the inoculation of the plants was carried out using two fully expanded leaves in at least two plants per test, through a gentle pressure of the leaf surface with the inoculum, using commercial Carborundo as abrasive (Matthews, Plant Virology, Third Edition (San Diego , Academic Press, Inc.) (1991) In the comparisons of the effect on viral infection of the sense and antisense ssRNA, dsRNA and cDNA molecules, equivalent molar concentrations were used.
- the inoculated plants were kept in culture chambers in standard growth conditions, checking the development of the symptoms of viral infection in systemic hosts during the time that their life cycle lasted In hosts of local lesion, the inoculated leaves were observed for at least 5 dpi.
- RNA samples were obtained from the inoculated leaves, between 6 and 10 dpi, and from the systemic leaves, between 6 and 21 dpi, according to the method described by Logemann et ai Anal . Biochem 163, 16 (1987).
- Total RNA samples (between 1 and 5 ⁇ g) were separated by electrophoresis in 1- 1.2% agarose-formaldehyde gels and transferred to Hybo ⁇ d-N membranes (Roche). Ethidium bromide stains were made from agarose gels prior to transfer to Hybond-N membranes, to confirm the integrity of the RNA and ensure the loading of similar amounts in each sample.
- Hybridization type Northern blot was carried out using digoxigenin-labeled RNA probes (Roche), as described by Neeleman and Bol 1)
- RNA probes were used to detect the RNAs of the different viruses.
- PMMoV RNA was detected with a probe complementary to nucleotides 341 1-4388 of PMMoV, which were transcribed from clone pT3T7 / 54-kDa (Tenllado et al, Virology 21 1, 170 (1995)
- TEV RNA was detected with a probe complementary to nucleotides 845-2328 of TEV, which were transcribed from the pBluescript S-HC clone.
- RNAs 3 and 4 of AMV were detected with a probe complementary to nucleotides 369-1493 of RNA 3 of AMV, transcribed from clone pBluescript SK- / AMV-3.
- the PMMoV RNA region encoding the 54-kDa protein and flanking sequences were inserted in a sense or antisense orientation between the CaMV 35S promoter and the transcriptional terminator of the 7-gene of TL-DNA, in the binary vector pGSJ780A (Plant Genetic System), as described in Tenllado et al, Virology 21 1, 170 (1995).
- pGSJ780A Plant Genetic System
- PMMoV infection can be specifically blocked with at least the 54-kDa dsRNA molecule and in at least two local hosts belonging to different plant genera
- hybridization bands corresponding to partially denatured 54-kDa dsRNA molecules were observed, in Northern blot analysis of total RNA preparations, obtained from the leaves of plants inoculated with viruses plus 54 -kDa dsRNA, or inoculated only with 54-kDa dsRNA, as verified by comparing these hybridization bands with the behavior of the preparation of 54-kDa dsRNA used in the inoculum and also analyzed.
- To determine the origin of these hybridization bands corresponding to 54-kDa dsRNA molecules, numerous experiments were performed. The analysis of the degradation kinetics of these molecules confirmed that the dsRNA used in the inoculum remains relatively stable and persists in the inoculated leaf at detectable levels, at least up to 7 dpi.
- the interference on PMMoV infection shown by the 54-kDa dsRNA molecule which, as described above, corresponds to the 54-kDa region of the gene encoding PMMoV replicase, could reflect some type of inhibitory effect of this sequence in in particular, about virus infection. Therefore, it was determined if other dsRNA molecules, derived from a different region of the PMMoV genome, could also specifically block PMMoV infection, when introduced simultaneously with the virus in the plant. To carry out this experiment, a dsRNA corresponding to a 596 bp fragment of the 30-kDa gene of the PMMoV movement protein (30-kDa dsRNA) was obtained as described above.
- the effect on viral infection of this 30-kDa dsRNA was compared with the known effect caused by the 54-kDa dsRNA or, also, with the effect caused by a dsRNA of viral origin but not homologous to PMMoV, such as that obtained from of the 1483 bp fragment corresponding to most of the TEV HC gene (TEV-HC dsRNA), as described above.
- the presence of 30-kDa dsRNA in inoculum like that of 54-kDa dsRNA, blocked the expression of viral symptoms in N Benthamiana, at times when control plants showed infection symptoms
- the accumulation of viral RNA in the RNA extracted from these plants was not detected, from the tissue corresponding to upper leaves (Fig. 3B).
- EXAMPLE 6 Direct application of dsRNA molecules derived from different viruses.
- dsRNA molecules could be a general application strategy to protect plants against infection by viruses other than PMMoV.
- viruses not related to the tobamovirus genus such as TEV were used, which belongs to the Potyviridae and AMV family that is part of the Bromoviridae family and the effect of different dsRNA derived from these viruses was studied, in the infection by their corresponding virus in a systemic host
- N tabacum plants were used, which were inoculated only with SP6 infective transcripts corresponding to a TEV cDNA clone, or with a mixture containing the previous TEV RNA transcripts plus the homologous dsRNA TEV-HC dsRNA.
- the plants inoculated with the mixture showed neither lesions located in the inoculated leaf nor systemic symptoms in the upper leaves, while the plants inoculated only with VTE showed symptoms of the disease at 6 dpi.
- Figure 4A shows an analysis by Northern blot of the total RNAs extracted from two plants per treatment, at 6 dpi. TEV RNA accumulated both in the inoculated leaves and in the systemic leaves of the control plants.
- RNA levels were below the detection limit in the plants inoculated with the mixture of virus and homologous dsRNA As described above, in this case also hybridization bands of varying intensity, corresponding to TEV-HC dsRNA, were observed in the total RNA extracted from the leaves inoculated with virus plus dsRNA. Similarly, N.
- benthamiana plants were inoculated, on the one hand, with a mixture of T7 transcripts of genomic RNAs 1, 2 and 3 of AMV and the capsid protein of AMV, since one of the distinguishing characteristics of The alfamovirus is that a mixture of the three genomic RNAs of the virus is not infective in plants, unless the virus capsid protein is added to the inoculum (Bol 1999) and, on the other hand, they were inoculated with this previously mentioned mixture plus a homologous dsRNA, which encompasses a 1 124 nucleotide fragment of AMV RNA 3 (AMV-3 dsRNA).
- AMV-3 dsRNA homologous dsRNA
- Figure 4B shows a Northern blot analysis of total RNAs extracted from the inoculated or systemic leaves of those plants, using a probe that recognizes genomic RNA 3 and AMV subgenomic RNA 4.
- the AMV RNAs 3 and 4 transcribed in vitro and the AMV-3 dsRNA used in the inoculum were used as controls.
- plants inoculated with the mixture of AMV RNAs plus AMV-3 dsRNA showed no symptoms of the disease, while plants inoculated only with AMV RNAs were susceptible to viral infection, showing systemic symptoms .
- RNAs 3 and 4 of the virus were accumulated both in tissue of inoculated leaves and in leaf tissue of the upper area of the plant. Therefore, it can specifically interfere with the infection of any virus, by applying any dsRNA molecule, as long as it shares sequence similarity with the virus.
- dsRNA to specifically interfere with viral infection is dependent on the length of the dsRNA molecule employed.
- benthamiana leaves As a control, plants with only 54-kDa ssRNA sense or antiseptid carrier cultures were agroinfiltrated At 4 days after agroinfiltration, the plants were inoculated with PMMoV directly on the infiltrated leaves. In three independent experiments, all the plants expressing transiently, either 54-kDa RNA sense or 54-kDa RNA antisense, showed symptoms of the disease in the leaves greater than 10 dpi, while the plants agrofiltered with the vectors expressing the mixture of 54-kDa sense and antisense RNA showed no symptoms, or their manifestation was delayed between 1 to 3 weeks, compared to controls.
- Figure 5 shows a Northern blot analysis of PMMoV RNA accumulation, in total RNA preparations extracted from two individuals by treatment at 15 dpi.
- the PMMoV RNA did not accumulate, or it did so at very low levels, while PMMoV RNA was never detected in the upper leaves of those plants.
- neither 54-kDa RNA sense, nor 54-kDa antisense RNA, expressed by Agrobacterium interfered with the accumulation of PMMoV, both in the inoculated leaves and in the systemic leaves of the control plants.
- Fig. 1 Schematic representation of the location in the PMMoV genome.
- Fig. 2 Specific interference with PMMoV infection by dsRNA in a local host.
- Fig. 3 DsRNA-mediated interference with PMMoV infection in a systemic host
- RNA sample was fractionated by electrophoresis in 1% agarose gel in (A), (B ) and (C), and subsequently, a digoxigenin labeled probe corresponding to 54-kDa RNA was used.
- the positions of the PMMoV RNA and the partially denatured RNA species derived from dsRNA used in the inoculum are indicated in the margins.
- the 25S ribosomal RNA bands stained with ethidium bromide are indicated as a control for loading the gels.
- Fig. 4 Interference mediated by dsRNA with infection of different plant viruses
- RNA sample Equivalent amounts (5 ⁇ g) of each RNA sample were fractionated by electrophoresis in 1% agarose gel and the filter was hybridized with an RNA probe labeled with specific digoxigenin versus TEV. The positions of TEV RNA and partially denatured RNA species derived from dsRNA used in inoculum are indicated in the margins.
- M RNA extracted from plant inoculated with buffer. AMV 3 and 4 RNAs (line 2) and AMV-3 dsRNA (line 5) were loaded into the gel for comparative purposes.
- RNA sample Equivalent amounts ( ⁇ g) of each RNA sample were fractionated by 1.2% agarose gel electrophoresis and the filter was hybridized with an RNA probe labeled with specific digoxigenin against AMV RNA 3.
- the positions of AMV 3 and 4 RNAs and partially denatured RNA species derived from dsRNA used in inoculum are indicated in the margins.
- Lower bands of 25S ribosomal RNA stained with ethidium bromide are indicated as a control for loading gels.
- Fig. 5 The transient expression of Agrobacterium-mediated 54-kDa dsRNA interferes with the infection of PMMoV ' (A) N. benthamiana plants were initially infiltrated, as indicated in the figure, with cultures of A. tumefaciens carrying the vector 54-kDa RNA sense expression
- RNA sample Equivalent amounts ( ⁇ g) of each RNA sample were fractionated by electrophoresis in 1% agarose gel and the filter was hybridized with an RNA probe labeled with specific digoxigenin against 54-kDa RNA. The position of the PMMoV RNA is indicated in the margin. In the lower part, the 25 S ribosomal RNA bands stained with ethidium bromide are indicated as a load control of the gels.
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ES2192945B1 (es) | 2005-03-01 |
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