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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.2009.tde-15042009-080416
Document
Author
Full name
Renata Takassugui Gomes
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 2009
Supervisor
Committee
Kitajima, Elliot Watanabe (President)
Astúa, Juliana de Freitas
Gloria, Beatriz Appezzato da
Title in Portuguese
Caracterização biológica e molecular do vírus da mancha clorótica de Clerodendrum ( Clerodendrum Chlorotic Spot Virus-CLCSV)
Keywords in Portuguese
Ácaros
Doenças de plantas
Histologia vegetal
Plantas ornamentais
Vírus de plantas.
Abstract in Portuguese
O gênero botânico Clerodendrum pertence à família Lamiaceae e compreende várias espécies ornamentais, geralmente trepadeiras, das quais as mais comumente cultivadas são coração-sangrento (C. x speciosum Tiejism. & Binn.) e lágrima-de-Cristo (C. thomsonae Balf.). Manchas cloróticas e necróticas em folhas de coração-sangrento foram observadas pela primeira vez em um jardim de Piracicaba, SP, associadas à infestação com Brevipalpus phoenicis Geijskes (Acari: Tenuipalpidae). Exames de secções de tecidos das lesões foliares ao microscópio eletrônico revelaram ocorrência de efeitos citopáticos do tipo nuclear e concluiu-se que os sintomas eram causados por um vírus transmitido por Brevipalpus (VTB), o qual foi tentativamente designado de mancha clorótica de Clerodendrum (Clerodendrum chlorotic spot virus- ClCSV). O ClCSV é transmitido mecanicamente de coração-sangrento para coração-sangrento e em ensaios preliminares foi transmitido mecanicamente e por Brevipalpus phoenicis para várias outras plantas, além da ocorrência de sua disseminação natural por esses ácaros para outras espécies. Ocorre a infecção sistêmica nas hospedeiras Chenopodium quinoa Will. e C. amaranticolor Coste & Reyn. infectadas com ClCSV caso as plantas sejam mantidas por cerca de 2 semanas entre 28-30 oC. Utilizando-se estas plantas realizou-se a purificação parcial do vírus. Este trabalho apresenta a caracterização biológica e molecular do ClCSV. Os resultados dos testes PTA-ELISA e RT-PCR demonstraram a detecção do ClCSV em diversas hospedeiras, além da análise da reação sorológica e molecular deste vírus com os outros VTBs do tipo nuclear. O seqüenciamento do produto de PCR revelou que as seqüências de nucleotídeos apresentaram similaridade com a polimerase de OFV (Orchid Fleck Virus), outro VTB do tipo nuclear. Além da identificação sorológica do vírus foram realizadas análises morfo-anatômicas para visualização das alterações causadas pelo ClCSV em tecidos de Clerodendrum x speciosum e em hospedeiras infectadas.
Title in English
Biological and molecular characterization of Clerodendrum chlorotic spot virus
Keywords in English
Brevipalpus phoenics
ClCSV
Clerodendrum x speciosum
Histopathology.
Viral genome
Abstract in English
The botanical genus Clerodendrum belongs to the family Lamiaceae and includes several ornamental species, usually climbing, and heart-bloody (C. x speciosum Tiejism. & Binn.) and tear-in-Christ (C. thomsonae Balf. ) are among the most cultivated. Necrotic and chlorotic spots on leaves of heart-blood have been observed for the first time in a garden of Piracicaba, associated with an infestation of Brevipalpus phoenicis Geijskes (Acari: Tenuipalpidae). Sections of diseased tissues examined in the electron microscope revealed characteristic cytopathic effects of the nuclear type and concluded that the symptoms were caused by a virus transmitted by Brevipalpus (VTB), tentatively named Clerodendrum chlorotic spot virus (ClCSV). This virus is transmitted through mechanical inoculation from heart-bloody to heart-bloody and in preliminary tests mechanically and by mites for several other plants, in addition to the natural occurrence of its spread to other species. Systemic infection occurs in the host Chenopodium quinoa Will. and C. amaranticolor Coste & Reyn. infected with ClCSV if the plants are kept at 28-30°C for about 2 weeks. These plants were used for partial purification of vírus. This study presents the biological and molecular characterization of ClCSV. Through the PTA-ELISA and RT-PCR tests was possible to detect the ClCSV in different host, in addition to the analysis of serological and molecular reaction of this virus with other type of nuclear VTBs. From the sequencing of the PCR product was obtained from nucleotide sequences that showed similarity to the polymerase of OFV (Orchid Fleck Virus), another type of nuclear VTB. Morpho-anatomical analysis were performed to see the changes caused by ClCSV in tissues of Clerodendrum x speciosum and other infected hosts. It was possible to observe the occurrence of hypertrophy, cell plasmolisis and the reduction of starch grains in the áreas injured in all plants infected by ClCSV.
 
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Publishing Date
2009-04-17
 
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