Viviana Camelo

Agricultural Research Service | ARS · Salinas, CA

A high incidence of plants with mosaic, chlorotic spots, ringspots, necrosis, smaller leaves, and stunting was observed on peanut crops (Arachis hypogaea L.) in Itapolis, So Paulo State, Brazil. Transmission electron microscope examination of thin sections of infected leaves revealed the presence of spheroidal particles, ca. 80 nm in diameter, sugg...

Zucchini lethal chlorosis virus (ZLCV) is a species of the genus Tospovirus, in the family Bunyaviridae, and is transmitted by thrips (Frankliniella zucchini). To date, ZLCV has only been reported in Brazil, where it causes a disease known as lethal chlorosis of zucchini squash. The aim of this study was to identify additional species susceptible t...

This work reports the complete genome sequence, production of a polyclonal antiserum, and host range of a Brazilian strain of johnsongrass mosaic virus (JGMV) found infecting Panicum maximum in the state of São Paulo, Brazil. The complete genome sequence of this potyvirus, comprising 9874 nucleotides, showed 82 % amino acid sequence identity in the...

In Brazil, Beet necrotic yellow vein virus (BNYVV), which causes rhizomania in red table-beet (Beta vulgaris subsp. vulgaris), was first reported in 2015. This study evaluated the pathogenic effects of the disease on biomass production of red table-beet plants under field conditions. The effect of rhizomania infection depended on the season when th...

Beet soil-borne virus (BSBV, genus Pomovirus) is a soil-borne virus transmitted by the protozoan Polymyxa betae (Henry et al. 1986; Adams et al. 2017). The BSBV is frequently detected in sugar beet samples infected with Beet necrotic yellow vein virus (BNYVV), which is the causal agent of rhizomania (Meunier et al. 2003). In 2015, BNYVV was detecte...

Sugar beet (Beta vulgaris L.) is grown in temperate regions around the world as a source of sucrose. Sugar beet is susceptible to a number of viral diseases, but identification of the causal agent(s) under field conditions is often difficult due to mixtures of viruses that may be responsible for disease symptoms. In this study, the application of R...

Background: Cowpea [Vigna unguiculata (L) Walp.] is one of the Paraguayan rural families' main crops, serving as an essential protein and carbohydrate source. Cowpea aphid borne mosaic virus (CABMV) and cowpea severe mosaic virus (CPSMV) were identified infecting cowpea plants. Disease control caused by both viruses is difficult because there is no...

Tomato crops are affected by various viral diseases. In Brazil, the most frequent of these diseases are caused by the begomovirus tomato severe rugose virus (ToSRV), the crinivirus tomato chlorosis virus (ToCV), and orthotospoviruses, mainly groundnut ringspot virus (GRSV) and tomato chlorotic spot virus (TCSV). Mixed infections can result in syner...

Plants of Physalis peruviana showing typical virus symptoms of mosaic and leaf distortion were found in the municipalities of Piracicaba city, São Paulo state, and Senador Amaral, Minas Gerais state, Brazil. Based on molecular assays and nucleotide sequencing, two potyviruses, potato virus Y (PVY) and pepper yellow mosaic virus (PepYMV) were identi...

Strongylodon macrobotrys, commonly known as the jade vine, emerald vine, or turquoise jade vine, is a species of Fabaceae native to the Philippines. The plants have blue-green color inflorescences, which makinge them one of the most admired ornamental plants in Brazil (Muniz et al. 2015). In addition, the plants contain compounds with anticancer pr...

Centella asiatica is a perennial, herbaceous creeper plant that belongs to the family Apiaceae. It has been known since prehistoric times and has been used for therapeutic and cosmetic purposes (James and Dubery 2009; Gohil et al. 2010), and is easily propagated vegetatively. In 2018, plants of C. asiatica exhibiting foliar symptoms of mosaic and m...

This work reports the genome sequence, host responses and transmission assays of two isolates of catharanthus mosaic virus (CatMV) from plants of Mandevilla sp. in the state of São Paulo, Brazil. The complete genome sequences of CatMV isolates, M1 and M2, comprised 9593 and 9711 nucleotides, respectively. The deduced polyprotein showed 99% (M1) and...

Senna rizzinii is a flowering shrub found mainly in the northeast region of Brazil. Here, we report the coding-complete genome sequence, particle morphology, mode of transmission, and the indicator host responses of an isolate of the putative allexivirus cassia mild mosaic virus (CaMMV) found in S. rizzinii. The virus was transmitted mechanically t...

The habanero chilli pepper, Capsicum chinense is an important crop in the Amazon Basin, mainly grown by small-scale producers. Capsicum chinense plants in an experimental field in the northern Brazilian state of Amazonas were found exhibiting characteristic symptoms of viral infection. Leaf sap from symptomatic plants examined under a transmission...

Nicotiana glauca exhibiting very mild mottling on the leaves was found in the municipality of Piracicaba, state of São Paulo, Brazil. Transmission electron microscope analysis of symptomatic tissue, biological assay on virus indicator hosts, and near complete genome sequence indicated infection with the tobamovirus Tobacco mild green mosaic virus....

Physalis peruviana is a perennial solanaceous plant that has recently been established as a commercial crop in Brazil. This work reports the near-complete genome sequence, particle morphology, and plant host responses to a putative new sobemovirus, named “physalis rugose mosaic virus”. The virus, characterized by isometric particles of ca. 30 nm in...

Soil-borne viruses transmitted by Polymyxa graminis can lead to major yield losses in wheat crops worldwide. This work describes the identification of a soil-borne virus infecting wheat plants in Paraguay. Based on electron microscopy observations of virus particles in symptomatic leaf and molecular assays the virus was identified as wheat stripe m...

Tospovirus can lead to major yield losses in several crops worldwide. This work describes the identification of a tospovirus infecting tomato and petunia plants. Based on molecular assays, the virus was identified as Groundnut ringspot tospovirus (GRSV). To our knowledge, this is the first report of GRSV in Paraguay.

Frankliniella zucchini transmits zucchini lethal chlorosis virus (ZLCV), causal agent of lethal chlorosis of zucchini squash. The characteristics of relationship between this virus with its vector have not been studied, one of the reasons being the lack of a method for rearing the thrips for laboratory studies. This work proposes a system for the r...

Tospovirus can lead to major yield losses in several crops worldwide. This work describes the identification of a tospovirus infecting tomato and petunia plants. Based on molecular assays, the virus was identified as Groundnut ringspot tospovirus (GRSV). To our knowledge, this is the first report of GRSV in Paraguay.

In this work, we report the complete genome sequence of, production of polyclonal antibodies against, and development of biological assays for a putative new potexvirus, named senna mosaic virus (SenMV), found infecting Senna occidentalis in the state of São Paulo, Brazil. The complete genome sequence of SenMV comprises 6775 nucleotides excluding t...

No capítulo são descritas as principais doenças que ocorrem na beterraba de mesa, biótipo mais cultivado no Brasil. RIZOMANIA - Beet necrotic yellow vein virus - BNYVV CERCOSPORIOSE - Cercospora beticola TOMBAMENTO OU “DAMPING-OFF” - Rhizoctonia solani, Phoma betae, Fusarium spp., Pythium spp. MANCHA DE FOLHAS - Phoma betae PODRIDÃO BRANCA - Scler...

In April 2014, we found peach fruits displaying symptoms of ringspots in a fruit and vegetable shop in the city of Piracicaba, São Paulo State, Brazil. The fruits were imported from Chile, where the occurrence of Plum pox virus (PPV) was first reported in apricots, plums, and peaches by Rosales et al. (1997). Extract from symptomatic fruit, examine...

Beet necrotic yellow vein virus (BNYVV) is an economically important pathogen of sugar beet (Beta vulgaris var. saccharifera) in several European, and Asian countries and in the United States (3). The virus is transmitted by the soil-inhabiting plasmodiophorid Polymyxa betae and causes the rhizomania disease of sugar beet. In November 2012, plants...