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Ishwara Bhat A, Selvarajan R, Balasubramanian V. Emerging and Re-Emerging Diseases Caused by Badnaviruses. Pathogens 2023; 12:pathogens12020245. [PMID: 36839517 PMCID: PMC9963457 DOI: 10.3390/pathogens12020245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/27/2023] [Accepted: 01/31/2023] [Indexed: 02/05/2023] Open
Abstract
New and emerging plant diseases are caused by different pathogens including viruses that often cause significant crop losses. Badnaviruses are pararetroviruses that contain a single molecule of ds DNA genome of 7 to 9 kb in size and infect a large number of economically important crops such as banana and plantains, black pepper, cacao, citrus, grapevine, pineapple, sugarcane, sweet potato, taro, and yam, causing significant yield losses. Many of the species in the genus have a restricted host range and several of them are known to infect a single crop. Combined infections of different virus species and strains offer conditions that favor the development of new strains via recombination, especially in vegetatively propagated crops. The primary spread of badnaviruses is through vegetative propagating materials while for the secondary spread, they depend on insects such as mealybugs and aphids. Disease emerges as a consequence of the interactions between host and pathogens under favorable environmental conditions. The viral genome of the pararetroviruses is known to be integrated into the chromosome of the host and a few plants with integrants when subjected to different kinds of abiotic stress will give rise to episomal forms of the virus and cause disease. Attempts have been made to develop management strategies for badnaviruses both conventionally and using precision breeding techniques such as genome editing. Until 2016 only 32 badnavirus species infecting different crops were known, but in a span of six years, this number has gone up to 68. The current review highlights the emerging disease problems and management options for badnaviruses infecting economically important crops.
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Affiliation(s)
- Alangar Ishwara Bhat
- Division of Crop Protection, ICAR-Indian Institute of Spices Research, Kozhikode 673012, Kerala, India
| | - Ramasamy Selvarajan
- Division of Crop Protection, ICAR-National Research Centre for Banana, Trichy 620102, Tamil Nadu, India
| | - Velusamy Balasubramanian
- Division of Crop Protection, ICAR-National Research Centre for Banana, Trichy 620102, Tamil Nadu, India
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2
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Singh V, Adil S, Quraishi A. Elimination of BBTV via a systemic in vitro electrotherapy approach. J Virol Methods 2021; 300:114367. [PMID: 34822911 DOI: 10.1016/j.jviromet.2021.114367] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 09/20/2021] [Accepted: 11/18/2021] [Indexed: 11/16/2022]
Abstract
Banana bunchy top virus (BBTV) is the most destructive etiological agent limiting banana cultivation areas globally. This study attempted BBTV elimination by traditional shoot-tip culture (control) and alternative shoot-tip + electrotherapy (treated) techniques. Shoot-tip culture from Musa acuminata cv. 'Grand Naine' infected sources were exposed to 100 mA electric current for different time intervals (20-60 min). Virus indexing (via PCR) and genetic fidelity (by ISSR assay) from the cultures were tested, alongside the physio-biochemical parameters. Exposure of electric current for less than 50 min was ineffective for BBTV elimination. Still, a rise in the duration from 50 min or more led to eradicating the virus from some explants. Elimination of BBTV was complete from 100 % of explants exposed to 100 mA for 60 min, as confirmed by lack of BBTV detection even at six months after acclimatization. In the control treatment, the maximum efficiency of BBTV elimination was 28 % after eight subcultures. On the other hand, improved survival % was observed in the treated culture. Moreover, homogenous ISSR patterns were there between the treated and the mother plant and similar physio-biochemical activities were seen in electro-exposed cultures and healthy ones. Thus, the study reports complete BBTV-elimination from banana with international compliances, for the first time, via electrotherapy while maintaining genomic template and biochemical stability.
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Affiliation(s)
- Vikram Singh
- School of Studies in Life Sciences, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India.
| | - Smriti Adil
- School of Studies in Biotechnology, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India.
| | - Afaque Quraishi
- School of Studies in Biotechnology, Pt. Ravishankar Shukla University, Raipur, Chhattisgarh, India.
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3
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Ricciuti E, Laboureau N, Noumbissié G, Chabannes M, Sukhikh N, Pooggin MM, Iskra-Caruana ML. Extrachromosomal viral DNA produced by transcriptionally active endogenous viral elements in non-infected banana hybrids impedes quantitative PCR diagnostics of banana streak virus infections in banana hybrids. J Gen Virol 2021; 102. [PMID: 34726592 DOI: 10.1099/jgv.0.001670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The main edible and cultivated banana varieties are intra- and interspecific hybrids of the two main Musa species, Musa acuminata and Musa balbisiana, having diploid genomes denoted A and B, respectively. The B genome naturally hosts sequences of banana streak virus (BSV) named endogenous BSV (eBSV). Upon stress, eBSVs are identified as the origin of BSV infection for at least three BSV species, causing banana streak disease. For each of the three species, BSV and eBSV share >99.9 % sequence identity, complicating PCR-based diagnosis of viral infection in the B genome-containing bananas. Here, we designed a quantitative PCR-based method to only quantify episomal BSV particles produced, overcoming the limitation of eBSV also being detected by qPCR by using it as a 'calibrator'. However, our results revealed unexpected variation of eBSV amplification in calibrator plants composed of a clonal population of 53 replicating virus-free banana hybrids with the same AAB genotype. Our in-depth molecular analyses suggest that this calibrator variation is due to the variable abundance of non-encapsidated extrachromosomal viral DNA, likely produced via the transcription of eBSVs, followed by occasional reverse transcription. We also present evidence that accumulation of viral transcripts in AAB plants is downregulated both at post-transcriptional and transcriptional levels by an RNA interference mechanism that keeps the plants free of virus infection. Finally, we recommend that such eBSV amplification variation be taken into account to establish a quantitative viral diagnostic for banana plants with the B genome.
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Affiliation(s)
- Emeline Ricciuti
- CIRAD, UMR BGPI, Univ Montpellier, INRAE, Montpellier SupAgro, Montpellier, 34984, France
| | - Nathalie Laboureau
- CIRAD, UMR BGPI, Univ Montpellier, INRAE, Montpellier SupAgro, Montpellier, 34984, France.,CIRAD, UMR PHIM, 34090 Montpellier, France.,PHIM Plant Health Institute, Univ Montpellier, INRAE, IRD, CIRAD, Institut Agro, Montpellier, France
| | - Guy Noumbissié
- CIRAD, UMR BGPI, Univ Montpellier, INRAE, Montpellier SupAgro, Montpellier, 34984, France
| | - Matthieu Chabannes
- CIRAD, UMR BGPI, Univ Montpellier, INRAE, Montpellier SupAgro, Montpellier, 34984, France.,CIRAD, UMR AGAP Intitute, F-34398 Montpellier, France.,AGAP Institute, Univ Montpellier, CIRAD, INRAE, Institut Agro, F-34398 Montpellier, France
| | - Natalia Sukhikh
- PHIM Plant Health Institute, Univ Montpellier, INRAE, IRD, CIRAD, Institut Agro, Montpellier, France.,Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences. Moscow, 119071, Russia
| | - Mikhail M Pooggin
- PHIM Plant Health Institute, Univ Montpellier, INRAE, IRD, CIRAD, Institut Agro, Montpellier, France
| | - Marie-Line Iskra-Caruana
- CIRAD, UMR BGPI, Univ Montpellier, INRAE, Montpellier SupAgro, Montpellier, 34984, France.,CIRAD, DGD-RS, F-34398 Montpellier, France
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4
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Tripathi JN, Ntui VO, Ron M, Muiruri SK, Britt A, Tripathi L. CRISPR/Cas9 editing of endogenous banana streak virus in the B genome of Musa spp. overcomes a major challenge in banana breeding. Commun Biol 2019; 2:46. [PMID: 30729184 PMCID: PMC6355771 DOI: 10.1038/s42003-019-0288-7] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 12/21/2018] [Indexed: 12/19/2022] Open
Abstract
Presence of the integrated endogenous banana streak virus (eBSV) in the B genome of plantain (AAB) is a major challenge for breeding and dissemination of hybrids. As the eBSV activates into infectious viral particles under stress, the progenitor Musa balbisiana and its derivants, having at least one B genome, cannot be used as parents for crop improvement. Here, we report a strategy to inactivate the eBSV by editing the virus sequences. The regenerated genome-edited events of Gonja Manjaya showed mutations in the targeted sites with the potential to prevent proper transcription or/and translational into functional viral proteins. Seventy-five percent of the edited events remained asymptomatic in comparison to the non-edited control plants under water stress conditions, confirming inactivation of eBSV into infectious viral particles. This study paves the way for the improvement of B genome germplasm and its use in breeding programs to produce hybrids that can be globally disseminated.
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Affiliation(s)
| | - Valentine O. Ntui
- International Institute of Tropical Agriculture (IITA), Nairobi, Kenya
| | - Mily Ron
- Department of Plant Biology, University of California, Davis, CA USA
| | - Samwel K. Muiruri
- International Institute of Tropical Agriculture (IITA), Nairobi, Kenya
| | - Anne Britt
- Department of Plant Biology, University of California, Davis, CA USA
| | - Leena Tripathi
- International Institute of Tropical Agriculture (IITA), Nairobi, Kenya
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5
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Bhat AI, Hohn T, Selvarajan R. Badnaviruses: The Current Global Scenario. Viruses 2016; 8:E177. [PMID: 27338451 PMCID: PMC4926197 DOI: 10.3390/v8060177] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 05/18/2016] [Accepted: 05/25/2016] [Indexed: 12/16/2022] Open
Abstract
Badnaviruses (Family: Caulimoviridae; Genus: Badnavirus) are non-enveloped bacilliform DNA viruses with a monopartite genome containing about 7.2 to 9.2 kb of dsDNA with three to seven open reading frames. They are transmitted by mealybugs and a few species by aphids in a semi-persistent manner. They are one of the most important plant virus groups and have emerged as serious pathogens affecting the cultivation of several horticultural crops in the tropics, especially banana, black pepper, cocoa, citrus, sugarcane, taro, and yam. Some badnaviruses are also known as endogenous viruses integrated into their host genomes and a few such endogenous viruses can be awakened, e.g., through abiotic stress, giving rise to infective episomal forms. The presence of endogenous badnaviruses poses a new challenge for the fool-proof diagnosis, taxonomy, and management of the diseases. The present review aims to highlight emerging disease problems, virus characteristics, transmission, and diagnosis of badnaviruses.
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Affiliation(s)
| | - Thomas Hohn
- UNIBAS, Botanical Institute, 4056 Basel, Switzerland.
| | - Ramasamy Selvarajan
- ICAR-National Research Centre for Banana, Tiruchirapalli 620102, Tamil Nadu, India.
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Seal S, Turaki A, Muller E, Kumar PL, Kenyon L, Filloux D, Galzi S, Lopez-Montes A, Iskra-Caruana ML. The prevalence of badnaviruses in West African yams (Dioscorea cayenensis-rotundata) and evidence of endogenous pararetrovirus sequences in their genomes. Virus Res 2014; 186:144-54. [PMID: 24457074 DOI: 10.1016/j.virusres.2014.01.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 12/19/2013] [Accepted: 01/11/2014] [Indexed: 02/09/2023]
Abstract
Yam (Dioscorea spp.) is an important vegetatively-propagated staple crop in West Africa. Viruses are pervasive in yam worldwide, decreasing growth and yield, as well as hindering the international movement of germplasm. Badnaviruses have been reported to be the most prevalent in yam, and genomes of some other badnaviruses are known to be integrated in their host plant species. However, it was not clear if a similar scenario occurs in Dioscorea yam. This study was conducted to verify the prevalence of badnaviruses, and determine if badnavirus genomes are integrated in the yam genome. Leaf samples (n=58) representing eight species of yam from global yam collections kept at CIRAD, France, and 127 samples of D. rotundata breeding lines (n=112) and landraces (n=15) at IITA, Nigeria, were screened using generic badnavirus PCR primers. Positive amplification of an expected ca. 579bp fragment, corresponding to a partial RT-RNaseH region, was detected in 47 (81%) of 58 samples analysed from CIRAD collections, and 100% of the 127 IITA D. rotundata samples. All the D. cayenensis and D. rotundata samples from the CIRAD and IITA collections tested PCR-positive, and sequencing of a selection of the PCR products confirmed they were typical of the genus Badnavirus. A comparison of serological and nucleic acid techniques was used to investigate whether the PCR-positives were sequences amplified from badnavirus particles or putative endogenous badnavirus sequences in the yam genome. Protein A sandwich-enzyme-linked immunosorbent assay (PAS-ELISA) with badnavirus polyclonal antisera detected cross-reacting viral particles in only 60% (92 of 153) of the CIRAD collection samples analysed, in contrast to the aforementioned 81% by PCR. Immunosorbent electron microscopy (ISEM) of virus preparations of a select set of 16 samples, representing different combinations of positive and negative PCR and PAS-ELISA results, identified bacilliform particles in 11 of these samples. Three PCR-positive yam samples from Burkina Faso (cv. Pilimpikou) were identified in which no viral particles were detected by either PAS-ELISA or ISEM. Southern hybridisation results using a yam badnavirus RT-RNaseH sequence (Gn155Dr) as probe, supported a lack of badnavirus particles in the cv. Pilimpikou and identified their equivalent sequences to be of plant genome origin. Probe Gn155Dr, however, hybridised to viral particles and plant genomic DNA in three D. rotundata samples from Guinea. These results represent the first data demonstrating the presence of integrated sequences of badnaviruses in yam. The implications of this for virus-indexing, breeding and multiplication of seed yams are discussed.
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Affiliation(s)
- Susan Seal
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK; CIRAD, UMR BGPI, F-34098 Montpellier, France.
| | - Aliyu Turaki
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK
| | | | - P Lava Kumar
- International Institute of Tropical Agriculture (IITA), Oyo Road PMB 5320, Ibadan, Nigeria
| | - Lawrence Kenyon
- Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK
| | | | - Serge Galzi
- CIRAD, UMR BGPI, F-34098 Montpellier, France
| | - Antonio Lopez-Montes
- International Institute of Tropical Agriculture (IITA), Oyo Road PMB 5320, Ibadan, Nigeria
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Aldaghi M, Massart S, Dutrecq O, Bertaccini A, Jijakli MH, Lepoivre P. A simple and rapid protocol of crude DNA extraction from apple trees for PCR and real-time PCR detection of 'Candidatus Phytoplasma mali'. J Virol Methods 2008; 156:96-101. [PMID: 19010357 DOI: 10.1016/j.jviromet.2008.10.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2008] [Revised: 10/01/2008] [Accepted: 10/07/2008] [Indexed: 11/16/2022]
Abstract
Different PCR protocols have been established for detection of European fruit trees phytoplasmas; however the majority of the procedures for extracting phytoplasma DNA are complex, time consuming, and expensive, with a risk of contamination or loss of target DNA. In present study, a crude extract preparation method previously used to detect other plant pathogens was adapted to samples from apple trees infected by 'Candidatus Phytoplasma mali'. End-point and real-time PCR detection of 'Ca. P. mali' were used to compare this extraction procedure with an established method for efficient extraction of purified DNA. The crude extract proved fully adequate for phytoplasma detection in samples from 86 in vitro and 35 in vivo apple shoots or plants and 10 periwinkle plants. High inter- and intra-run reproducibility was obtained for phytoplasma detection with different TaqMan MGB- or SYBR Green-based real-time PCR protocols applied to the crude extracts. Real-time PCR applied to serially diluted crude and purified extracts revealed the same phytoplasma detection limit (dilution up to 10(5)). All results confirm the suitability of this simple, quick, efficient extraction technique for accurate detection of 'Ca. P. mali' in different types of apple and periwinkle samples.
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Affiliation(s)
- M Aldaghi
- Plant Pathology Unit, Gembloux Agricultural University (FUSAGx), Passage des déportés 2, 5030 Gembloux, Belgium
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8
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Vincelli P, Tisserat N. Nucleic Acid-Based Pathogen Detection in Applied Plant Pathology. PLANT DISEASE 2008; 92:660-669. [PMID: 30769590 DOI: 10.1094/pdis-92-5-0660] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nucleic acid–based (NA-based) detection techniques are becoming fundamental for the applied plant pathologist. Their speed, sensitivity, specificity, versatility have resulted in the use of these tools to address an increasing number of applied questions and hypotheses. In order to use based detection techniques to best advantage, it is important to recognize only their advantages but also their limitations, such as the possibility particular NA-based tests may not have complete specificity for the of interest and only for that organism. The distinction between detection and disease diagnosis must also be recognized, and we believe NA-based tools are techniques for the former and not the latter. Several pathogen detection technologies are also discussed.
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9
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The effectiveness of somatic embryogenesis in eliminating the cocoa swollen shoot virus from infected cocoa trees. J Virol Methods 2008; 149:91-6. [DOI: 10.1016/j.jviromet.2008.01.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Revised: 12/21/2007] [Accepted: 01/10/2008] [Indexed: 11/22/2022]
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10
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Feng JL, Chen SN, Tang XS, Ding XF, Du ZY, Chen JS. Quantitative determination of cucumber mosaic virus genome RNAs in virions by real-time reverse transcription-polymerase chain reaction. Acta Biochim Biophys Sin (Shanghai) 2006; 38:669-76. [PMID: 17033712 DOI: 10.1111/j.1745-7270.2006.00216.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
A real-time RT-PCR procedure using the green fluorescent dye SYBR Green I was developed for determining the absolute and relative copies of cucumber mosaic virus (CMV) genomic RNAs contained in purified virions. Primers specific to each CMV ORF were designed and selected. Sequences were then amplified with length varying from 61 to 153 bp. Using dilution series of CMV genome RNAs prepared by in vitro transcription as the standard samples, a good linear correlation was observed between their threshold cycle (Ct) values and the logarithms of the initial template amounts. The copies of genomic RNA 1, RNA 2, RNA 3 and the subgenomic RNA 4 in CMV virions were quantified by this method, and the ratios were about 1.00:1.17:3.58:5.81. These results were confirmed by Lab-on-a-chip and northern blot hybridization assays. Our work is the first report concerning the relative amounts of different RNA fragments in CMV virions as a virus with tripartite genome.
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Affiliation(s)
- Jun-Li Feng
- Institute of Bioengineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
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11
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Le Provost G, Iskra-Caruana ML, Acina I, Teycheney PY. Improved detection of episomal Banana streak viruses by multiplex immunocapture PCR. J Virol Methods 2006; 137:7-13. [PMID: 16857272 DOI: 10.1016/j.jviromet.2006.05.021] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2006] [Revised: 05/17/2006] [Accepted: 05/25/2006] [Indexed: 11/28/2022]
Abstract
Banana streak viruses (BSV) are currently the main viral constraint to Musa germplasm movement, genetic improvement and mass propagation. Therefore, it is necessary to develop and implement BSV detection strategies that are both reliable and sensitive, such as PCR-based techniques. Unfortunately, BSV endogenous pararetrovirus sequences (BSV EPRVs) are present in the genome of Musa balbisiana. They interfere with PCR-based detection of episomal BSV in infected banana and plantain, such as immunocapture PCR. Therefore, a multiplex, immunocapture PCR (M-IC-PCR) was developed for the detection of BSV. Musa sequence tagged microsatellite site (STMS) primers were selected and used in combination with BSV species-specific primers in order to monitor possible contamination by Musa genomic DNA, using multiplex PCR. Furthermore, immunocapture conditions were optimized in order to prevent Musa DNA from interfering with episomal BSV DNA during the PCR step. This improved detection method successfully allowed the accurate, specific and sensitive detection of episomal DNA only from distinct BSV species. Its implementation should benefit PCR-based detection of viruses for which homologous sequences are present in the genome of their hosts, including transgenic plants expressing viral sequences.
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Affiliation(s)
- Grégoire Le Provost
- CIRAD, UMR BGPI, Campus International de Baillarguet, F-34398 Montpellier Cedex 5, France
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12
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Sayler RJ, Cartwright RD, Yang Y. Genetic Characterization and Real-Time PCR Detection of Burkholderia glumae, a Newly Emerging Bacterial Pathogen of Rice in the United States. PLANT DISEASE 2006; 90:603-610. [PMID: 30781136 DOI: 10.1094/pd-90-0603] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Panicle blight of rice (Oryza sativa), caused by the bacterium Burkholderia glumae, is one of the most important new diseases in rice production areas of the southern United States. In this study, pathogenic strains were isolated from diseased panicles in Arkansas rice fields and examined using the Biolog GN microplate system, whole cell fatty acid methyl ester analysis (FAME), rep-polymerase chain reaction (PCR) genomic DNA fingerprinting, and 16S-23S ribosomal DNA (rDNA) intergenic transcribed spacer (ITS) sequence analysis. The B. glumae isolates from Arkansas can be divided into two major groups, but their genetic diversity was relatively low as revealed by 16S-23S rDNA ITS sequence analysis. Since no practical method existed, up to now, for testing the presence of B. glumae in rice seeds, we have developed in this study a real-time PCR method that is effective in detecting and identifying the pathogen in seed lots and in whole plants. The specific PCR primers were designed based on the 16S-23S rDNA ITS sequence of several representative isolates from Arkansas and Japan. This method is highly sensitive, rapid, and reliable, and has great potential for analyzing large numbers of samples without the need for DNA extraction or agarose gel electrophoresis. Although vertical resistance has not been observed among tested rice cultivars, LM-1 and Drew exhibited considerable resistance to B. glumae infection based on disease lesion size and the bacterial growth in planta.
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Affiliation(s)
- Ronald J Sayler
- Department of Plant Pathology, University of Arkansas, 217 Plant Science Building, Fayetteville 72701
| | - Richard D Cartwright
- Department of Plant Pathology and Cooperative Extension Service, 2301 South University Avenue, Little Rock, AR 72203
| | - Yinong Yang
- Department of Plant Pathology, University of Arkansas, 217 Plant Science Building, Fayetteville 72701
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Gao X, Jackson TA, Lambert KN, Li S, Hartman GL, Niblack TL. Detection and Quantification of Fusarium solani f. sp. glycines in Soybean Roots with Real-Time Quantitative Polymerase Chain Reaction. PLANT DISEASE 2004; 88:1372-1380. [PMID: 30795200 DOI: 10.1094/pdis.2004.88.12.1372] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fusarium solani f. sp. glycines is the causal organism of soybean sudden death syndrome (SDS). This organism is difficult to detect and quantify because it is a slow-growing fungus with variable phenotypic characteristics. Reliable and fast procedures are important for detection of this soybean pathogen. Protocols were optimized for extraction of DNA from pure fungal cultures and fresh or dry roots. A new procedure to test polymerase chain reaction (PCR) inhibitors in DNA extracts was developed. Novel real-time quantitative PCR (QPCR) assays were developed for both absolute and relative quantification of F. solani f. sp. glycines. The fungus was quantified based on detection of the mitochondrial small-subunit rRNA gene, and the host plant based on detection of the cyclophilin gene of the host plant. DNA of F. solani f. sp. glycines was detected in soybean plants both with and without SDS foliar symptoms to contents as low as 9.0 × 10-5 ng in the absolute QPCR assays. This is the first report of relative QPCR using the comparative threshold cycle (Ct) method to quantify the DNA of a plant pathogen relative to its host DNA. The relative QPCR assay is reliable if care is taken to avoid reaction inhibition and it may be used to further elucidate the fungus-host interaction in the development of SDS or screen for resistance to the fungus.
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Affiliation(s)
- X Gao
- Department of Crop Sciences, University of Illinois at Urbana and Champaign, Urbana 61801-4798
| | - T A Jackson
- Department of Crop Sciences, University of Illinois at Urbana and Champaign, Urbana 61801-4798
| | - K N Lambert
- Department of Crop Sciences, University of Illinois at Urbana and Champaign, Urbana 61801-4798
| | - S Li
- Department of Crop Sciences, University of Illinois at Urbana and Champaign, Urbana 61801-4798
| | - G L Hartman
- United States Department of Agriculture-Agricultural Research Service, Urbana, IL 61801-4723, and Department of Crop Sciences, University of Illinois at Urbana and Champaign
| | - T L Niblack
- Department of Crop Sciences, University of Illinois at Urbana and Champaign
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