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Doctoral Thesis
DOI
https://doi.org/10.11606/T.11.1900.tde-20240301-143946
Document
Author
Full name
Remberto Herbas Arze
Institute/School/College
Published
Piracicaba, 1968
Supervisor
Title in Portuguese
O mosaico do caqui (D. kaki) e algumas propriedades físicas do agente causador
Keywords in Portuguese
CAQUI
MOSAICO
PROPRIEDADES FÍSICAS
VÍRUS DE PLANTAS
Abstract in Portuguese
Algumas plantações de caqui (D. kaki) do Município de Mogi das Cruzes apresentaram uma doença virosa em tolhas novas com sintomas que se caracterizaram por apresentar áreas cloróticas de aspecto deprimido e também por áreas necróticas acompanhadas de deformação do limbo. Durante o período de maturação dos frutos, as folhas que atingiram o seu tamanho definitivo, exibem manchas cloróticas que alternam com áreas verdes normais. A planta atacada sofre queda pretura das folhas. Os sintomas nas flores consistem de uma necroses parcial ou total das diferentes peças florais ocasionando a queda das mesmas. Os sintomas nos frutos consistem em pintas, anéis e faixas cloróticas ou necróticas que podem atingir profundidades variáveis do mesocarpo. Os sintomas nos brotos caracterizam-se por áreas necróticas de diferentes formas, tamanho e profundidade que ocasiona a morte prematura no sentido basi-petal. O vírus causador do mosaico do caqui é isodiamétrico. É transmitido mecanicamente por infectivos ou pelo vírus isolado mediante centrifugação diferencial. O estudo do circulo de hospedeiros prova que várias espécies de plantas de diferentes famílias são, susceptíveis ao vírus causador do mosaico do caqui. As propriedades físicas in vitro causador do mosaico do caqui são as seguintes: Ponto máximo de diluição é de 1:10 000. Ponto termal de inativação está entre 75°C e 80°C. A longevidade é de 72 horas.
Abstract in English
The persimmon (D. kaki) orchards in Mogi das Cruzes, and in other São Paulo State areas, too, are affected by disease which is characterized by a depressed chlorotic or necrotic areas with some deformation of the limb on the first young leaves, by a typical mottling when they get the definite size, by the premature leaf fall, by the necrosis of some parts or the entire flower that later falls, by streak, circular or annular necrotic areas on the fruit and by different kind of necrosis of the wood and above all of the bark of the shoots and twigs that causes the dieback. This disease that we call “kaki mosaic” proved to be caused by a isodiametric shape virus that is transmitted mechanically by crude sap inoculation as well as by partially purified virus. The virus was partially purified by differential centrifugation. The host range study shows that several species of plants that belong to different families are susceptible to the persimmon mosaic virus. The physical properties of persimmon mosaic virus in vitro are as follows: Dilution end point is 1:10.000. Thermal inactivation point is between 75°C and 80°C. The longevity is 72 hours.
 
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725280.pdf (15.54 Mbytes)
Publishing Date
2024-03-12
 
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