Lesões foliares e de ramos de laranjeira-doce causadas pela leprose-dos-citros

Marques, João Paulo Rodrigues; Freitas-Astúa, Juliana; Kitajima, Elliot Watanabe; Appezzato‐da‐Glória, Beatriz

doi:10.1590/s0100-204x2007001100003

Cited by 19 publications

(22 citation statements)

References 13 publications

(20 reference statements)

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“…Marques et al (2007) studied the anatomical changes caused by CiLV-C in leaf and fruit tissues, and associated some of them with the possible mechanisms that may prevent the virus from becoming systemic. Such alterations include parenchyma cell hypertrophy, hyperplasy, and the accumulation of lipidic compounds.…”

Section: Introductionmentioning

confidence: 99%

Comparative morpho-anatomical studies of the lesions caused by citrus leprosis virus on sweet orange

Marques¹,

Kitajima

Freitas-Astúa

et al. 2010

An. Acad. Bras. Ciênc.

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The leprosis disease shows a viral etiology and the citrus leprosis virus is considered its etiologic agent. The disease may show two types of cytopatologic symptom caused by two virus: nuclear (CiLV-N) and cytoplasmic (CiLV-C) types. The aim of this study was to compare the morpho-anatomical differences in the lesions caused by leprosis virus-cytoplasmic and nuclear types in Citrus sinensis (L.) Osbeck 'Pêra'. Leaf and fruit lesions were collected in Piracicaba/São Paulo (cytoplasmic type) and Monte Alegre do Sul/São Paulo and Amparo/São Paulo (nuclear type). The lesions were photographed and then fixed in Karnovsky solution, dehydrated in a graded ethylic series, embedded in hydroxy-ethyl methacrylate resin (Leica Historesin), sectioned (5μm thick), stained and mounted in synthetic resin. The digital images were acquired in a microscope with digital video camera. Leaf and fruit lesions caused by the two viruses were morphologically distinct. Only the lesion caused by CiLV-N virus presented three well-defined regions. In both lesions there was the accumulation of lipidic substances in necrotic areas that were surrounded by cells with amorphous or droplets protein. Only leaf and fruit lesions caused by CiLV-N virus exhibited traumatic gum ducts in the vascular bundles.

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Section: Introductionmentioning

confidence: 99%

Comparative morpho-anatomical studies of the lesions caused by citrus leprosis virus on sweet orange

Marques¹,

Kitajima

Freitas-Astúa

et al. 2010

An. Acad. Bras. Ciênc.

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“…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). Como o CiLV não é sistêmico (Marques et al, 2007) e não é naturalmente transmitido por material propagativo infectado e nem mecanicamente, a dispersão da doença no campo ocorre exclusivamente pela alimentação e Pesq. agropec.…”

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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“…This may explain the negative cases for detection of characteristic cytopathic effect of CiLV-C. However, in several of these negative cases, hypertrophy of some spongy parenchyma cells, a characteristic alteration in the lesions caused by CiLV-C (Marques et al, 2007) was evident and may be considered an indication for their infection by CiLV-C. In this sense, immunfluorescence ( Figure 5) was superior to detect viroplasms, since it explores a larger area of thicker sections, which improves significantly the chances of detecting CiLV-C infected cells.…”

Section: Provincia De Entre Ríosmentioning

confidence: 98%

Present status of citrus leprosis in Argentina and Paraguay

Cáceres¹,

Aguirre²,

Costa³

et al. 2013

Trop. plant pathol.

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Citrus leprosis (CL) was first described in South America in the 1920's. It is considered similar to a disease first observed back to 1860 in Florida. It is a destructive disease characterized by localized lesions on the leaves, fruits and stems, which may lead to the death of the affected plant if left untreated. Around 1940, CL was demonstrated to be transmitted by Brevipalpus mites in Argentina. Because little information exists on the status of CL pathosystem in Argentina and Paraguay, a survey was made in several citrus growing areas of these countries from 2009 to 2011, to evaluate its presence and relevance as well as the identification of the virus and the mite vector. CL was found in most of the sweet orange and/or mandarin orchards in Paraguay (Departamentos de Boquerón, Concepción, San Pedro, Cordillera, Alto Paraná, Itapúa) and Argentina (Provincias de Misiones, Corrientes, Entre Ríos). Incidence was usually low. The causal virus was identified as Citrus leprosis virus C (CiLV-C) by RT-PCR, electron microscopy and immunofluorescence. In all the visited regions in Paraguay and the region of Montecarlo, Argentina, the mites collected in plants infected by CiLV-C were identified as B. phoenicis.

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Lesões foliares e de ramos de laranjeira-doce causadas pela leprose-dos-citros

Cited by 19 publications

References 13 publications

Comparative morpho-anatomical studies of the lesions caused by citrus leprosis virus on sweet orange

Comparative morpho-anatomical studies of the lesions caused by citrus leprosis virus on sweet orange

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

Present status of citrus leprosis in Argentina and Paraguay

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