First Report of a Tobamovirus in Dieffenbachia and Impatiens

Tobamoviruses were detected in two ornamental plants, Dieffenbachia picta (Araceae) and Impatiens hawkeri (Balsaminaceae), from different counties in São Paulo State, Brazil. Symptoms were chlorotic spots and rings in D. picta and mosaic, blistering, and leaf deformation in I. hawkeri. Mechanical transmission from both species induced different kinds and intensities of symptoms in the same experimental hosts (Balsaminaceae, Chenopodiaceae, and Solanaceae), except Gomphrena globosa, which was infected only by the isolate from D. picta. The viruses did not infect Cucurbitaceae and Fabaceae. Indirect enzyme-linked immunosorbent assay performed with extracts from infected Nicotiana tabacum ‘White Burley’ and antisera against Cucumber green mottle, mosaic, Frangipani mosaic, Odontoglossum ringspot, Ribgrass mosaic, Tobacco mosaic (TMV), Tomato mosaic, Turnip vein clearing, and Youcai mosaic viruses (genus To-bamovirus) was positive only for TMV. Furthermore, the viruses isolated from D. picta and I. hawkeri cross-reacted with their heterologous antisera. Two sense primers for regions ≍200 and 90 nt upstream of the start codon and an antisense primer ≍60 nt downstream of the terminal codon of the coat protein (CP) gene were designed for two amplification assays. Migrating fragments the same size as the reverse-transcription polymerase chain reaction products from the TMV type strain (479 and 800 bp with internal and external primers, respectively) were produced. The CP gene sequence will allow comparison and identification of the two viruses isolated from D. picta and I. hawkeri.

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Detection of Cucumber mosaic virus in commercial anthurium crops and genotypes evaluation

Horticultura Brasileira ◽

10.1590/s0102-05362013000200024 ◽

2013 ◽

Vol 31 (2) ◽

pp. 322-327 ◽

Cited By ~ 4

Author(s):

Nancy de S Miura ◽

Luís OS Beriam ◽

Eliana B Rivas

Keyword(s):

Cucumber Mosaic Virus ◽

Mosaic Virus ◽

Ornamental Plants ◽

Mechanical Transmission ◽

Virus Species ◽

Important Species ◽

Natural Hosts ◽

Productive Potential ◽

Leaf Deformation ◽

Anthurium Andraeanum

In Brazil, Anthurium andraeanum (flamingo flower) stands out as an important species for cut leaves and flowers productions, as well as potted cultivation. Due to the fact that ornamental plants play an important part in the tropical agriculture diversification, there is great interest to know the problems that affect anthurium cultivation in order to improve its productive potential. The aims of this study were identify the causal agent of intense mosaic and leaf deformation observed in anthurium commercial crops from four cities of the São Paulo state, Brazil; to assess the extent of the virus occurrence in these cities and the methods for its detection, as well as to analyse the anthurium genotypes reactions in relation to the virus. Anthuriums were sampled from the following cities: Mogi das Cruzes, Pariquera-Açu, Iguape and Registro. Leaves and spathes from symptomatic plants were used in mechanical transmission assays. The virus was transmitted only when spathes were used to prepare the inocula, and it induced Cucumber mosaic virus (CMV)-like symptoms in the indicator hosts. PTA-ELISA and RT-PCR were performed to identify the virus species, since CMV was detected in all agricultural areas sampled. Anthuriums from IAC varieties, 'Jureia', 'Garoa', 'Eidibel' and 'Astral' and from 'Caipira' and 'Branco' cultivars were inoculated with CMV and all of them were susceptible to the virus. Some of the symptoms observed in CMV infected anthuriums although similar to those induced by Dasheen mosaic virus, are more severe for inducing leaf deformation and intensive mosaic. Both viruses are worldwide spread and transmitted by aphid in a non-persistent manner. Although CMV has a wide host range, it was not found in the literature the presence of anthurium as a host to the virus. The eradication of weed plants, mainly Commelina and Tradescantia that are CMV natural hosts, the elimination of the symptomatic anthuriums and control of the aphid population should also be done in the anthurium crop, since anthurium genotypes with resistance for CMV are not available.

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Identification, Characterization, and Molecular Detection of Alfalfa mosaic virus in Potato

Phytopathology ◽

10.1094/phyto-96-1237 ◽

2006 ◽

Vol 96 (11) ◽

pp. 1237-1242 ◽

Cited By ~ 34

Author(s):

H. Xu ◽

J. Nie

Keyword(s):

Mosaic Virus ◽

Gene Sequence ◽

Alfalfa Mosaic Virus ◽

Enzyme Linked Immunosorbent Assay ◽

Polymorphism Analysis ◽

Rt Pcr ◽

Potato Leaf ◽

Simple Method ◽

Cp Gene ◽

Nucleotide Sequence Alignment

Alfalfa mosaic virus (AMV) was detected in potato fields in several provinces in Canada and characterized by bioassay, enzyme-linked immunosorbent assay, and reverse-transcription polymerase chain reaction (RT-PCR). The identity of eight Canadian potato AMV isolates was confirmed by sequence analysis of their coat protein (CP) gene. Sequence and phylogenetic analysis indicated that these eight AMV potato isolates fell into one strain group, whereas a slight difference between Ca175 and the other Canadian AMV isolates was revealed. The Canadian AMV isolates, except Ca175, clustered together among other strains based on alignment of the CP gene sequence. To detect the virus, a pair of primers, AMV-F and AMV-R, specific to the AMV CP gene, was designed based on the nucleotide sequence alignment of known AMV strains. Evaluations showed that RT-PCR using this primer set was specific and sensitive for detecting AMV in potato leaf and tuber samples. AMV RNAs were easily detected in composite samples of 400 to 800 potato leaves or 200 to 400 tubers. Restriction analysis of PCR amplicons with SacI was a simple method for the confirmation of PCR tests. Thus, RT-PCR followed by restriction fragment length polymorphism analysis may be a useful approach for screening potato samples on a large scale for the presence of AMV.

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Prevalence and Molecular Characterization Coat Protein Gene of Tobacco streak virus Causing Peanut Stem Necrosis Disease in Coastal and Rayalaseema Districts of Andhra Pradesh, South-India

Legume Research - An International Journal ◽

10.18805/lr-4515 ◽

2021 ◽

Author(s):

K. Saratbabu ◽

K. Vemana ◽

A.K. Patibanda ◽

B. Sreekanth ◽

V. Srinivasa Rao

Keyword(s):

Coat Protein ◽

Molecular Characterization ◽

Andhra Pradesh ◽

Disease Incidence ◽

Tobacco Streak Virus ◽

Enzyme Linked Immunosorbent Assay ◽

Streak Virus ◽

Rt Pcr ◽

Cp Gene ◽

Stem Necrosis

Background: Peanut stem necrosis disease (PSND) caused by Tobacco streak virus (TSV) is a major constraint for groundnut production in Andhra Pradesh (A.P.). However, studies on prevalence and spread of the disease confined to only few districts of A.P. with this background current study focused on incidence and spread of the disease in entire state of A.P. Further an isolate of TSV occurring in A.P. characterized on the basis of genetic features by comparing with other TSV isolates originated from different hosts and locations from world.Methods: Roving survey was conducted during kharif 2017-18 in groundnut growing districts of Andhra Pradesh (A.P.) for peanut stem necrosis disease incidence. Groundnut plants showing PSND symptoms were collected and tested with direct antigen coating enzyme linked immunosorbent assay (DAC-ELISA). Groundnut samples found positive by ELISA once again tested by reverse transcription polymerase chain reaction (RT-PCR). The representative TSV-GN-INDVP groundnut isolate from Prakasham district was maintained on cowpea seedlings by standard sap inoculation method in glasshouse for further molecular characterization. The Phylogenetic tree for coat protein (CP) gene was constructed using aligned sequences with 1000 bootstrap replicates following neighbor-joining phylogeny.Result: Thirty-eight (52.7%) of seventy-two groundnut samples collected from different locations in A.P were given positive reaction to TSV by DAC-ELISA. For the first time, PSND incidence observed in coastal districts (Krishna, Guntur, Sri Pottisriramulu Nellore, Prakasham) of A.P. Maximum PSND incidence recorded from Bathalapalli (22.2%) and the minimum incidence in Mulakalacheruvu (4.1%). The coat protein (CP) gene of TSV-GN-INDVP groundnut isolate was amplified by RT-PCR and it shared maximum per cent nucleotide identity (97.51-98.62%) with TSV isolates from groundnut and other different crops reported in India. All Indian isolates cluster together irrespective of crop and location based on the phylogenetic analysis.

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Detection of a Severe Isolate of Impatiens Necrotic Spot Virus Infecting Lisianthus in Florida

Plant Disease ◽

10.1094/pdis.1997.81.11.1334b ◽

1997 ◽

Vol 81 (11) ◽

pp. 1334-1334 ◽

Cited By ~ 3

Author(s):

R. J. McGovern ◽

J. E. Polston ◽

B. K. Harbaugh

Keyword(s):

Leaf Tissue ◽

Impatiens Necrotic Spot Virus ◽

Enzyme Linked Immunosorbent Assay ◽

Mechanical Transmission ◽

Necrotic Spot ◽

Spot Virus ◽

Eustoma Grandiflorum ◽

Systemic Necrosis ◽

Low Incidence ◽

Leaf Distortion

In May 1997, inclusions typical of a tospovirus were visualized by light microscopy in leaf tissue of lisianthus (Eustoma grandiflorum) exhibiting stunting, necrotic ringspots, leaf distortion, and systemic necrosis. Wilting and plant death were the final symptoms observed. Affected plants occurred at low incidence (<0.1%) in greenhouse-grown lisianthus in Manatee County, FL. Symptomatic tissue tested positive for impatiens necrotic spot virus (INSV) and negative for tomato spotted wilt virus (TSWV) with enzyme-linked immunosorbent assay (ELISA; Agdia, Elkhart, IN). Mechanical transmission of the virus to lisianthus and tomato was attempted by triturating 1 g of symptomatic leaf tissue in 7 ml of a buffer consisting of 0.01 M Tris and 0.01 M sodium sulfite, pH 7.3. Six plants of lisianthus cv. Maurine Blue and three of tomato (Lycopersicon esculentum) cv. Lanai at the second true-leaf stage were inoculated following abrasion of leaves with Carborundum. An equal number of controls were inoculated with buffer alone. Plants were maintained in a controlled environment chamber with a 12-h photoperiod, day/night temperatures of 21/16°C, and light intensity of 120 μE · s-l · m-2. Transmission rates were 100 and 0% to lisianthus and tomato, respectively. Chlorotic local lesions followed by chlorotic ringspots were observed in inoculated lisianthus leaves 4 days after inoculation. Stunting, leaf distortion, and necrotic ringspots appeared in noninoculated leaves of lisianthus plants within 3 to 4 weeks after inoculation. Buffer-inoculated lisianthus and all tomato plants remained symptomless and tested negative for INSV by ELISA. All symptomatic lisianthus tested positive for INSV by ELISA. The symptoms we observed in lisianthus due to infection by INSV were more severe than those previously reported in this host (1,2). The occurrence of such strains of INSV at high incidences could pose a significant threat for commercial lisianthus production. References: (1) M. K. Hausbeck et al. Plant Dis. 76:795, 1992. (2) H. T. Hsu and R. H. Lawson. Plant Dis. 75:292,1991.

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Induction and Transcription Studies of the Dextransucrase Gene in Leuconostoc mesenteroides NRRL B-512F

Applied and Environmental Microbiology ◽

10.1128/aem.65.12.5504-5509.1999 ◽

1999 ◽

Vol 65 (12) ◽

pp. 5504-5509 ◽

Cited By ~ 31

Author(s):

M. Quirasco ◽

A. López-Munguía ◽

M. Remaud-Simeon ◽

P. Monsan ◽

A. Farrés

Keyword(s):

High Performance ◽

Leuconostoc Mesenteroides ◽

Carbon Sources ◽

Promoter Sequence ◽

Culture Conditions ◽

Start Codon ◽

Reaction Products ◽

Product Specificity ◽

First Time

ABSTRACT Dextransucrase production by Leuconostoc mesenteroidesNRRL B-512F in media containing carbon sources other than sucrose is reported for the first time. Dextransucrases were analyzed by gel electrophoresis and by an in situ activity assay. Their polymers and acceptor reaction products were also compared by 13C nuclear magnetic resonance and high-performance liquid chromatography techniques, respectively. From these analyses, it was found that, independently of the carbon source, L. mesenteroides NRRL B-512F produced dextransucrases of the same size and product specificity. The 5′ ends of dextransucrase mRNAs isolated from cells grown under different culture conditions were identical. Based on this evidence, we conclude that dextransucrases obtained from cells grown on the various carbon sources result from the transcription of the same gene. The control of expression occurs at this level. The low dextransucrase yields from cultures in d-glucose ord-fructose and the enhancement of dextransucrase gene transcription in the presence of sucrose suggest that an activating phenomenon may be involved in the expression mechanism. Dextransucrase mRNA has a size of approximately 4.8 kb, indicating that the gene is located in a monocistronic operon. The transcription start point was localized 34 bp upstream from the ATG start codon. The −10 and −35 sequences found, TATAAT and TTTACA, were highly homologous to the only glycosyltransferase promoter sequence reported for lactic acid bacteria.

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Pepino mosaic virus on Tomato Seed: Virus Location and Mechanical Transmission

Plant Disease ◽

10.1094/pdis-92-12-1701 ◽

2008 ◽

Vol 92 (12) ◽

pp. 1701-1705 ◽

Cited By ~ 28

Author(s):

Kai-Shu Ling

Keyword(s):

Mosaic Virus ◽

Large Scale ◽

Seed Transmission ◽

Enzyme Linked Immunosorbent Assay ◽

Mechanical Transmission ◽

Tomato Seed ◽

Tomato Production ◽

Pepino Mosaic Virus ◽

Infectivity Assay ◽

Seed Coats

In just a few years, Pepino mosaic virus (PepMV) has become a major threat to greenhouse tomato production around the world. Although tomato seed is suspected to spread the disease, its importance as an initial virus inoculum for PepMV has not been established. To determine the potential for seed transmission, a tomato seed lot highly contaminated with PepMV was used for large-scale seedling grow-out tests. None of 10,000 grow-out seedlings was infected as determined by symptom expression, enzyme-linked immunosorbent assay (ELISA), or infectivity assay on Nicotiana benthamiana. Even though PepMV was not seed transmitted on tomato, the virus was effectively transmitted to tomato and N. benthamiana seedlings through mechanical transmission with seed extract. To examine the exact location where PepMV particles accumulated on the tomato seed, seed coats and embryos were carefully isolated and tested separately by ELISA, real-time RT-PCR, and bioassay on N. benthamiana. PepMV was detected in the seed coat fraction in both immature and mature tomato seeds, but not in the embryo. However, in N. benthamiana, the virus was neither seedborne nor seed-transmitted. Because PepMV is seedborne in tomato, efficient mechanical transmission of PepMV from the virus-contaminated tomato seed to seedlings could initiate a disease epidemic in a new tomato growing area. Thus, it is important to plant certified tomato seed that has been tested free of PepMV.

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First Report on Natural Occurrence of Tomato Spotted Wilt Tospovirus in Basil (Ocimum basilicum)

Plant Disease ◽

10.1094/pdis.1999.83.10.966b ◽

1999 ◽

Vol 83 (10) ◽

pp. 966-966 ◽

Cited By ~ 5

Author(s):

G. E. Holcomb ◽

R. A. Valverde ◽

J. Sim ◽

J. Nuss

Keyword(s):

Plant Viruses ◽

Ocimum Basilicum ◽

Enzyme Linked Immunosorbent Assay ◽

Mechanical Transmission ◽

Summer Drought ◽

Natural Occurrence ◽

Thin Sections ◽

First Report ◽

Tomato Spotted Wilt ◽

National University

Virus-like symptoms were observed on basil plants (Ocimum basilicum L. ‘Mrs. Burns Lemon’ [MBL]) growing in containers and a demonstration plot at the Louisiana State University Burden Research Plantation, Baton Rouge, during July 1998. Symptoms consisted of ring spots, leaf distortion, and severe mosaic. Mechanical transmission of the suspect virus by sap inoculation from infected MBL to basil cvs. MBL, Aussie Sweet, Cinnamon, Siam Queen, and Sweet Dani was successful. Symptoms were similar to those on infected MBL. Nicotiana benthamiana Domin. reacted with local chlorotic spots followed by severe yellows, necrosis, and death. Electron microscopy of thin sections of infected basil revealed virus inclusions but no virus particles. However, infected N. benthamiana revealed the presence of 82-nm membrane-bound particles in the cytoplasm. The virus was identified from basil and N. benthamiana as the common strain of tomato spotted wilt tospovirus (TSWV) by enzyme-linked immunosorbent assay (Agdia, Elkhart, IN). An outbreak of thrips insects during the summer drought in 1998 was probably responsible for the occurrence of TSWV in basil. This is the first report of the occurrence of TSWV in basil (1). Reference: (1) A. A. Brunt et al., eds. 1996. Plant Viruses Online: Descriptions and Lists from the VIDE Database. Published online by Australian National University, Canberra.

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First report of Tomato black ring virus infecting raspberry and blackberry in Poland

Plant Disease ◽

10.1094/pdis-11-20-2321-pdn ◽

2021 ◽

Author(s):

Elżbieta Dąbrowska ◽

Elżbieta Paduch-Cichal ◽

Patrycja Piasna ◽

Tadeusz Malewski ◽

Ewa Mirzwa-Mróz

Keyword(s):

Plant Viruses ◽

Rubus Idaeus ◽

Black Ring ◽

Enzyme Linked Immunosorbent Assay ◽

Tagetes Patula ◽

Tomato Black Ring Virus ◽

First Report ◽

Cp Gene ◽

Rubus Fruticosus ◽

Wide Range

Raspberry (Rubus idaeus L.) and blackberry (Rubus fruticosus L.) are infected by at least 29 viruses, including the Tomato black ring virus (TBRV) (Martin et al. 2013). TBRV belongs to the genus Nepovirus (subgroup B) of the family Secoviridae and is listed as a plant pathogen in over 40 countries. TBRV infects a wide range of herbaceous and woody plants. In Poland, TBRV has been described on the plants of the following species: Tagetes patula, T. erecta, Cucumis sativus, Cucurbita pepo, Lactuca sativa, Solanum tuberosum, S. lycopersicum, Sambucus nigra, and Robinia pseudoacacia (Jończyk et al. 2004, Hasiów-Jaroszewska et al. 2015). To this date, there is no information on the incidence of TBRV in raspberry and blackberry in Poland. In the spring of 2019, 52 blackberry leaf samples and 408 raspberry leaf samples were collected from 4 plantations located in central Poland. None of the raspberry plants (cvs. Glen Ample, Polka, Sokolica), nor the blackberry plants (cvs. Thornfree, Polar, Gaj, Kotata) exhibited viral symptoms. Enzyme-linked immunosorbent assay (ELISA) was carried out for extracts from the 460 collected leaf samples to detect TBRV using commercial antisera (Loewe Biochemica GmbH, Germany). The results indicated that 9 samples (4 blackberry, 5 raspberry) were infected with TBRV. The isolates of the virus were transferred by sap inoculation and maintained in Nicotiana tabacum cv. Xanthi. Systemic ringspot, necrosis and patterned lines were observed on tobacco leaves. The presence of the virus in tobacco leaf samples was confirmed by reverse transcription PCR (RT-PCR). Total RNA was extracted from all 9 samples using the silica capture (SC) method described originally by Boom et al. (1990) and adapted to the detection of plant viruses by Malinowski (1997). Part of the CP gene was amplified with the CPF (5’-GCCTGTCTCTCTCGCAATG-3’) and CPR (5’-AAGGAGCCAAACTGAAATGT-3’) primer pair (Hasiów-Jaroszewska et al. 2015). Amplicons of the expected size (763 bp) were obtained for each sample. The amplified products were purified, sequenced in both directions, deposited in GenBank and assigned accession numbers: MT507387 to MT507390 and MT507394 for the isolates from Rubus idaeus and MT507391 to MT507393 and MN954654 for the isolates from Rubus fruticosus, respectively. The 9 newly obtained TBRV CP gene sequences, together with the 25 isolates deposited in GenBank, were aligned by ClustalW. The isolates obtained in this study showed a 99.0-100% nucleotides (nt) and a 98.7-100% amino acids (aa) identity in the part of the CP, respectively. Comparison of the part of the CP of the 4 blackberry and the 5 raspberry TBRV isolates with 25 TBRV isolates available in GenBank showed a 80.6-97.8% nt and a 87.9-99.5% aa identity, respectively. The results of the phylogenetic analysis have revealed that the TBRV isolates obtained in this study are closely related to 3 Polish isolates (AY157994, KR139941, KR139951) and 1 Bioreba ctrl Switzerland isolate (KT923164). These findings are of epidemiological significance due to the fact that TBRV was detected on symptomless Rubus plants, which therefore represent a reservoir of the virus and a threat in case of a symptomatic infection of sensitive cultivars. Accordingly, the results will assist in using appropriate strategies for reducing TBRV incidence in Rubus-growing areas. Moreover, this is, to the best of our knowledge, the first report of TBRV in raspberry and blackberry in Poland.

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Performance of Transgenic Tomatoes Expressing Cucumber Mosaic Virus CP Gene under Epidemic Conditions

HortScience ◽

10.21273/hortsci.33.6.1032 ◽

1998 ◽

Vol 33 (6) ◽

pp. 1032-1035 ◽

Cited By ~ 7

Author(s):

John F. Murphy ◽

Edward J. Sikora ◽

Bernard Sammons ◽

Wojciech K. Kaniewski

Keyword(s):

Cucumber Mosaic Virus ◽

Mosaic Virus ◽

Capsid Protein ◽

Field Trials ◽

Enzyme Linked Immunosorbent Assay ◽

Capsid Protein Gene ◽

Cp Gene ◽

Subgroup Ii ◽

Transgenic Lines ◽

Transgenic Tomatoes

Three processing tomato (Lycopersicon esculentum Mill.) lines engineered to express the cucumber mosaic virus (CMV) capsid protein (CP) gene were evaluated in the summers of 1995 and 1996 under high levels of naturally occurring CMV disease pressure. One tomato line expressed the capsid protein gene from a subgroup II isolate of CMV (line 11527), whereas two lines (12261 and 12295) expressed the capsid protein genes from a CMV subgroup I and a subgroup II isolate. Evaluation of CMV incidence based on symptomatic plants revealed that only 9% and 8% of the plants in line 11527 were infected in 1995 and 1996, respectively, 5 weeks after being transplanted. None of the plants in line 12261 developed symptoms in 1995, whereas 26% were symptomatic in 1996. There were no symptomatic plants in line 12295 in either the 1995 or the 1996 trial. In contrast to the CMV transgenic lines, 96% and 95% of the susceptible control plants were symptomatic by the 5-week rating period. CMV incidence in the CMV transgenic lines was much higher when infection was based on detection of virus by enzyme-linked immunosorbent assay (ELISA). This was particularly true in the 1996 trial where no less than 97% of the plants within a treatment were determined to be infected. Though a relatively high percentage of the transgenic plants were infected, the amount of CMV that accumulated in these plants was significantly less than in the susceptible controls, which may explain the occurrence of the attenuated symptoms. Despite CMV infection of the transgenic lines in the Alabama field trials, the performance of these lines could be of practical value to growers.

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First Report of a Tospovirus Infection of Peanuts in Iran

Plant Disease ◽

10.1094/pdis.2001.85.12.1286c ◽

2001 ◽

Vol 85 (12) ◽

pp. 1286-1286 ◽

Cited By ~ 6

Author(s):

A. R. Golnaraghi ◽

N. Shahraeen ◽

R. Pourrahim ◽

Sh. Ghorbani ◽

Sh. Farzadfar

Keyword(s):

Chenopodium Quinoa ◽

Datura Stramonium ◽

Enzyme Linked Immunosorbent Assay ◽

Leaf Extracts ◽

Systemic Necrosis ◽

First Report ◽

Severe Stunting ◽

Gomphrena Globosa ◽

Golestan Province ◽

Wilt Virus

During the summer of 2000, severe stunting, mosaic, bud necrosis, and chlorosis symptoms were observed on peanut (Arachis hypogaea cv. Gilan) plants growing in fields in the Golestan Province of Iran. Leaf extracts of peanut plants were infective (mechanical inoculation) causing necrotic local lesions on Chenopodium quinoa, C. amaranticolor, Gomphrena globosa, Phaseolus vulgaris cv. Talash, Vicia faba, and Vigna unguiculata cv. Mashad; systemic chlorotic spots were followed by systemic necrosis in Datura stramonium, D. metel, and Nicotiana rustica; chlorotic and necrotic spots were followed by top necrosis in Glycine max. About 2 weeks after inoculation, the chlorosis followed by stunting and bud necrosis observed in the field were reproduced in A. hypogaea cv. Gilan. Tomato spotted wilt virus (TSWV) was detected in the original peanut plants and in plant species that developed symptoms after inoculation with extracts from peanut plants, when analyzed by double-antibody sandwich enzyme-linked immunosorbent assay using TSWV-specific antisera (polyclonal antibody As-0526 and As-0580, DSMZ, Braunschweig, Germany). TSWV is one of the most important viruses in the world (2) and has been reported on potato (3) and tomato (1) in Iran. To our knowledge, this is the first report of TSWV infection of peanut in Iran. References: (1) K. Bananej et al. Iran. J. Plant Pathol. 34:30, 1998. (2) R. A. Mumford et al. Ann. Appl. Biol. 128:159, 1996. (3) R. Pourrahim et al. Plant Dis. 85:442, 2001.

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