Reação de variedades e clones de laranjas a Xylella fastidiosa
Carregando...
Data
2006-04-01
Autores
Souza, Paulo Sergio de
Goes, Antonio de [UNESP]
Stuchi, Eduardo Sanches
Jaimes, Elena Paola González [UNESP]
Wickert, Ester [UNESP]
Silva, Simone Rodrigues da
Donadio, Luiz Carlos [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Fruticultura
Resumo
A clorose variegada dos citros (CVC) é uma doença grave, causada por Xylella fastidiosa. As medidas usuais de controle mostram-se pouco eficientes ou práticas e com alto custo. Dessa forma, o uso de variedades resistentes e/ou tolerantes desponta como a alternativa mais eficiente, razão pela qual se julgou oportuna a realização deste trabalho. O presente estudo teve como objetivo avaliar o comportamento de variedades e clones de laranjas introduzidas em relação a X. fastidiosa. Foram estudados 59 variedades e clones de laranjas doces e 2 de laranjas azedas introduzidos da França, Itália e Portugal. O delineamento experimental foi o de blocos casualizados (DBC), com 62 tratamentos e 4 repetições, incluindo a variedade 'Pêra', como padrão. Cada parcela continha duas plantas, sendo uma inoculada e a outra sem inoculação. Para a inoculação do patógeno, foi empregado o método de encostia, utilizando-se de mudas infectadas. Para a avaliação da incidência da doença, utilizou-se de dados qualitativos, positivos ou negativos, enquanto para severidade empregou-se escala de notas, que foi estabelecida baseando-se nos sintomas de CVC, confirmados através dos testes de PCR. As variedades de laranjas azedas Beja e Sr. Pinto e as laranjas doces Navelina ISA 315, Navelina SRA 332 e Newhall Navel SRA 343 não apresentaram sintomas em folhas até 27 meses após a inoculação.
Citrus variegated chlorosis (CVC) is a serious disease, caused by Xylella fastidiosa, being the most important to the Brazilian citriculture. The usual measures of control show less efficient or practice and they are very expensive. The use of resistant varieties is showed as the most efficient, consisting the aimed of this research. The objective of the present work was study the behavior of varieties and clones introduced in relation to X. fastidiosa. Were studied 59 varieties and clones of sweet oranges and 2 sour oranges introduced from France, Italy and Portugal. The experimental layout was a complete randomized block design, with 4 replicates and 62 treatments, with 'Pêra' variety as control. Each treatment had two plants, one inoculated and the other without inoculation. For the pathogen inoculation was used the grafting approach with infected seedlings. For the disease incidence measurement was used qualitative data, positive or negative, while for the severity it, was used a note scale based on CVC symptoms confirmed through the PCR tests. The sour oranges varieties Beja and Sr. Pinto and the sweet oranges Navelina ISA 315, Navelina SRA 332 e Newhall Navel SRA 343, have not presented leaves symptoms until 27 months after inoculation.
Citrus variegated chlorosis (CVC) is a serious disease, caused by Xylella fastidiosa, being the most important to the Brazilian citriculture. The usual measures of control show less efficient or practice and they are very expensive. The use of resistant varieties is showed as the most efficient, consisting the aimed of this research. The objective of the present work was study the behavior of varieties and clones introduced in relation to X. fastidiosa. Were studied 59 varieties and clones of sweet oranges and 2 sour oranges introduced from France, Italy and Portugal. The experimental layout was a complete randomized block design, with 4 replicates and 62 treatments, with 'Pêra' variety as control. Each treatment had two plants, one inoculated and the other without inoculation. For the pathogen inoculation was used the grafting approach with infected seedlings. For the disease incidence measurement was used qualitative data, positive or negative, while for the severity it, was used a note scale based on CVC symptoms confirmed through the PCR tests. The sour oranges varieties Beja and Sr. Pinto and the sweet oranges Navelina ISA 315, Navelina SRA 332 e Newhall Navel SRA 343, have not presented leaves symptoms until 27 months after inoculation.
Descrição
Palavras-chave
Citrus, CVC, Bacteria, tolerance, Disease, Citros, CVC, Bactéria, Tolerância, doença
Como citar
Revista Brasileira de Fruticultura. Sociedade Brasileira de Fruticultura, v. 28, n. 1, p. 145-147, 2006.