Caracterização fitossanitária e seleção de limeiras ácidas 'Tahiti' clone Quebra-galho candidatas a matrizes
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Data
2007-07-04
Autores
Silva, Simone Rodrigues da [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Objetivando caracterizar sanitariamente a lima ácida ‘Tahiti’ clone Quebra-galho [C. latifolia (Yu. Tanaka) Tanaka] e selecionar plantas candidatas a matrizes, 80 plantas foram avaliadas quanto aos sintomas de tristeza, exocorte, sorose e pelo estado nutricional, desenvolvimento, produção e qualidade de frutos e por testes biológicos para as viroses citadas e xiloporose. Para viróides, empregou-se também RT-PCR. Todos os testes biológicos foram positivos para tristeza e negativos para xiloporose. Para exocorte, 82,5% dos testes foram positivos. No caso da sorose, 11,2% dos testes foram positivos apesar das plantas de campo não apresentarem sintomas. Quanto à tristeza, a reação em ‘Galego’ foi fraca (58,8%), média (40%) e forte (1,2%), sem caneluras nos ramos das plantas no campo. Os viróides Hop stunt viroid (HSVd), Citrus dwarfing viroid (CVd-III) e o Citrus exocortis viroid (CEVd) foram encontrados em 31,3%, 82,5% e 100,0% das plantas, respectivamente. Todas as plantas estudadas estavam infectadas com o CTV e com o CEVd, que foi encontrado isoladamente ou em combinação com outros viróides. Diferenças observadas na expressão dos sintomas de exocorte e tristeza na copa e no porta-enxerto podem ser atribuídas a interferências entre os viróides e a seleção pela multiplicação de gemas de árvores contaminadas por variantes pouco virulentas. O estado nutricional, o desenvolvimento, a produção e a qualidade dos frutos não apresentaram associação com o tipo de contaminação por viróides, o que também ocorreu com as plantas selecionadas como candidatas a matrizes em função da produção e qualidade física dos frutos.
Aiming at to characterize sanitarily the acid lime ‘Tahiti’ clone “Quebragalho” [C. latifolia (Yu. Tanaka) Tanaka] and select applicant mother plants, 80 plants were evaluated about the symptoms of tristeza disease, exocortis, psorosis and nutritional state, development, production and quality of the fruits, and by biological tests for the cited viruses and xyloporosis. For the viroids, was used RT-PCR too. All the biological tests were positive for tristeza disease and negative for xyloporosis. For exocortis, 82.5% of the tests were positive. In the case of the psorosis, 11.2% of the tests were positive although the plants in the field do not present symptoms. To the tristeza disease, the reaction in 'Galego' was of weak (58.8%), middle (40.0%) and strong (1.2%), without pittings in the branches of the plants in the field. The viroids Hop stunt viroid (HSVd), Citrus dwarfing viroid (CVd-III) and the Citrus exocortis viroid (CEVd) were found, respectively, in 31.3%, 82.5% and 100.0% of the plants. All of the plants in study were infected with the CTV and the CEVd, that was found isolately or in combinations with other viroids. Differences observed in the expression of the exocortis symptoms and tristeza disease in the cup and in the rootstock can be attributed to interferences between the viroids and the selection by the multiplication through cuttings of infected trees by strains few virulent. The nutritional state, development, production and quality of the fruits, did not presented association with the type of contamination by viroids, what also occurred with the applicant mother plants selected in function of the production and physical quality of the fruits.
Aiming at to characterize sanitarily the acid lime ‘Tahiti’ clone “Quebragalho” [C. latifolia (Yu. Tanaka) Tanaka] and select applicant mother plants, 80 plants were evaluated about the symptoms of tristeza disease, exocortis, psorosis and nutritional state, development, production and quality of the fruits, and by biological tests for the cited viruses and xyloporosis. For the viroids, was used RT-PCR too. All the biological tests were positive for tristeza disease and negative for xyloporosis. For exocortis, 82.5% of the tests were positive. In the case of the psorosis, 11.2% of the tests were positive although the plants in the field do not present symptoms. To the tristeza disease, the reaction in 'Galego' was of weak (58.8%), middle (40.0%) and strong (1.2%), without pittings in the branches of the plants in the field. The viroids Hop stunt viroid (HSVd), Citrus dwarfing viroid (CVd-III) and the Citrus exocortis viroid (CEVd) were found, respectively, in 31.3%, 82.5% and 100.0% of the plants. All of the plants in study were infected with the CTV and the CEVd, that was found isolately or in combinations with other viroids. Differences observed in the expression of the exocortis symptoms and tristeza disease in the cup and in the rootstock can be attributed to interferences between the viroids and the selection by the multiplication through cuttings of infected trees by strains few virulent. The nutritional state, development, production and quality of the fruits, did not presented association with the type of contamination by viroids, what also occurred with the applicant mother plants selected in function of the production and physical quality of the fruits.
Descrição
Palavras-chave
Cítricos - Doenças e pragas, Viroides, Indexação biológica, Indexação molecular, Sintomas, Citrus, Biological indexation, Molecular indexation, Disease, Symptoms, Viroids
Como citar
SILVA, Simone Rodrigues da. Caracterização fitossanitária e seleção de limeiras ácidas 'Tahiti' clone Quebra-galho candidatas a matrizes. 2007. xv, 155 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2007.