The citrus leprosis pathosystem

Bastianel, Marinês; Freitas-Astúa, Juliana; Kitajima, Elliot Watanabe; Machado, Marcos Antônio

doi:10.1590/s0100-54052006000300001

Cited by 52 publications

(65 citation statements)

References 24 publications

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“…Entre os fatores que limitam a produtividade da citricultura brasileira e aumentam seus custos de produção destacam-se as doenças, principalmente as viroses, como a leprose-dos-citros (Bastianel et al, 2006). Causada pelo Citrus leprosis virus (CiLV), é uma doença endêmica nas regiões produtoras do Estado de São Paulo e reduz a produção e o período de vida útil das plantas afetadas (Rodrigues, 2000).…”

Section: Introductionunclassified

Modelo autologístico espaço-temporal com aplicação à análise de padrões espaciais da leprose-dos-citros

Franciscon

Ribeiro

Krainski

et al. 2008

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi propor estratégias de modelagem aplicadas aos dados de incidência de leprose-dos-citros, por meio do uso de um modelo autologístico espaço-temporal. A adequação do modelo autologístico foi avaliada quanto à: análise de dados provenientes de avaliações feitas em diferentes momentos; detecção de padrões espaciais da doença, pela avaliação de diferentes estruturas de vizinhança; consideração do efeito defasado no tempo de covariáveis de vizinhança; e ao efeito do ácaro transmissor na probabilidade de nova infecção. O modelo autologístico espaço-temporal adotado estendeu o modelo logístico usual, em que a estrutura de vizinhança é descrita por meio da construção de covariáveis, a partir da resposta observada em plantas vizinhas à planta avaliada, na mesma avaliação, ou em avaliações anteriores. Os dados de incidência de leprose nas plantas de citros foram coletados em pontos referenciados no espaço, durante aproximadamente dois anos. Os modelos detectam o efeito da presença do vetor e os padrões espaciais na ocorrência de novas infecções, tanto para covariáveis de vizinhança da mesma avaliação, quanto para covariáveis de vizinhança da avaliação anterior. Além disso, os modelos considerados permitem quantificar as variações na probabilidade de ocorrência da doença de acordo com o estado da doença e com a incidência do ácaro transmissor. Termos para indexação: Brevipalpus phoenicis, Citrus leprosis virus, Citrus sinensis, estatística espacial, estruturas de vizinhança, pseudo-verossimilhança. Spatial temporal autologistic model with an application to the analysis of spatial patterns of citrus leprosisAbstract -The goal of this study was to propose modeling strategies applied to the analysis of citrus leprosis incidence, through the use of a spatial temporal autologistic model. We evaluated the adequacy of autologistic model to consider data collected at different times; to detect spatial-temporal patterns through different neighboring structures; to consider the effect of covariates from previous times; and assessing the effect of the presence of the disease vector in the probability of new infections occurrence. The spatial temporal autologistic model adopted has extended the usual logistic model, in which the neighboring structures is described by means of covariates built from the status of plants nearby, at the same or at previous times. Data regarding the presence of the leprosis on plants were collected at field points referenced in space, over a period of approximately two years. Models detect the presence of spatial patterns on new infections for the studied neighboring structures, at the same or previous time. Additionally, probability estimates of a plant become infected can be obtained from the fitted models, given the occurrence of the disease and vector.

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Section: Introductionunclassified

Modelo autologístico espaço-temporal com aplicação à análise de padrões espaciais da leprose-dos-citros

Franciscon

Ribeiro

Krainski

et al. 2008

Pesq. agropec. bras.

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“…In the 1930's, it was found in Argentina, Uruguay, Paraguay and Brazil. Since then, it has been reported from other South American countries (Bolivia, Colombia and Venezuela) as well as from Central American countries (Panama, Costa Rica, Honduras, Guatemala, Mexico) Bastianel et al, 2006). The disease is of concern for citrus growers in the Caribbean region, where the virus is absent, and in the US, where it has not been found since the 1960's (Childers et al, 2003c).…”

Section: Plant Viruses Transmitted By Brevipalpus Mitesmentioning

confidence: 99%

“…The situation becomes more complex because Brevipalpus mites have already been found in most of the tropical and subtropical regions of the world, infesting many plant species. Additionally, economically important BTV, such as CiLV-C and CoRSV are able to infect other plant species including some ornamentals (Bastianel et al, 2006;Novelli et al, 2008), under either natural or experimental conditions. Thus these viruses may accidentally be introduced into disease-free regions by infected ornamentals.…”

Section: Brevipalpus-transmitted Viruses and Ornamentalsmentioning

confidence: 99%

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An annotated list of ornamentals naturally found infected by Brevipalpus mite-transmitted viruses

Kitajima¹,

Rodrigues²,

Freitas-Astúa

2010

Sci. agric. (Piracicaba, Braz.)

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The first cases of ornamental plants found infected by Brevipalpus transmitted viruses (BTV) were described in the 1990's from the region of Piracicaba, State of São Paulo, Brazil; subsequent cases were from other regions in the country and other American countries. Currently, 37 ornamental plant species (for the sake of simplicity, orchids being considered as a single species), belonging to 18 families of dicotyledons, have been reported hosting BTV. Because of the non systemic type of infection of these viruses, the localized diseases they cause are unimportant usually, but they have the potential to cause economic losses if severe outbreaks of Brevipalpus mite populations occur. Some ornamentals may serve as reservoirs to BTV known to cause serious damage to food crops as Citrus leprosis virus-cytoplasmic type (CiLV-C), passion fruit green spot virus (PFGSV) and Coffee ringspot virus (CoRSV). Key words: Acari, Tenuipalpidae, ornamental industry Lista comentada de plantas ornamentais naturalmente infectadas por vírus transmitidos por ácaros Brevipalpus RESUMO: Os primeiros casos de plantas ornamentais encontradas naturalmente infetadas por vírus transmitidos por Brevipalpus (Acari: Tenuipalpidae) (VTB) foram registrados nos anos 1990 na região de Piracicaba, Estado de São Paulo, e ocorrências subseqüentes foram observadas em várias outras regiões do país e de outros países das Américas. Atualmente acham-se relatadas 37 espécies de ornamentais (para efeito de simplificação, orquídeas foram consideradas como única espécie) pertencentes a 18 famílias botânicas. Pelo fato de causarem apenas infecções localizadas, geralmente nas folhas, VTB em ornamentais não causam preocupações aos produtores, mas potencialmente podem causar perdas econômicas se ocorrerem explosões populacionais do ácaro vetor. Plantas ornamentais podem servir de reservatório de VTB de importância econômica como os vírus da leprose dos citros-tipo citoplasmático (CiLV-C), da mancha verde do maracujá (PFGSV) e da mancha anular do cafeeiro (CoRSV). Palavras-chave: Acari, Tenuipalpidae, indústria de ornamentais BREVIPALPUS MITES

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“…Sweet orange varieties [Citrus sinensis (L.) Osbeck] are highly susceptible to the virus, and plants may be completely destroyed if left untreated (Müller et al, 2005). In Brazil, around US$ 100 million are spent annually for the chemical control of its vector, the false spider mite Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) (Bastianel et al, 2006). The disease symptoms are characterized by chlorotic or necrotic local lesions on the leaves, stems and fruit at the mites' feeding areas.…”

mentioning

confidence: 99%

In vitro expression and antiserum production against the movement protein of Citrus leprosis virus C (CiLV-C)

Calegario¹,

Labate²,

Peroni³

et al. 2012

Trop. plant pathol.

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Citrus leprosis, caused by Citrus leprosis virus C (CiLV-C), is currently considered the most important viral disease in the Brazilian citrus industry due to the high costs required for the chemical control of its vector, the mite Brevipalpus phoenicis. The pathogen induces a non-systemic infection and the disease is characterized by the appearance of localized lesions on citrus leaves, stems and fruits, premature fruit and leaf drop and dieback of stems. Attempts were made to promote in vitro expression of the putative cell-to-cell movement protein of CiLV-C in Escherichia coli and to produce a specific polyclonal antibody against this protein as a tool to investigate the virus-plantvector relationship. The antibody reacted strongly with the homologous protein expressed in vitro by ELISA, but poorly with the native protein present in leaf lesion extracts from sweet orange caused by CiLV-C. Reactions from old lesions were more intense than those from young lesions. Western blot and in situ immunolocalization assays failed to detect the native protein. These results suggest low expression of the movement protein (MP) in host tissues. Moreover, it is possible that the conformation of the protein expressed in vitro and used to produce the antibody differs from that of the native MP, hindering a full recognition of the latter.

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The citrus leprosis pathosystem

Cited by 52 publications

References 24 publications

Modelo autologístico espaço-temporal com aplicação à análise de padrões espaciais da leprose-dos-citros

Modelo autologístico espaço-temporal com aplicação à análise de padrões espaciais da leprose-dos-citros

An annotated list of ornamentals naturally found infected by Brevipalpus mite-transmitted viruses

In vitro expression and antiserum production against the movement protein of Citrus leprosis virus C (CiLV-C)

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