Estudos ecológicos sobre Puccinia psidii winter - ferrugem das mirtáceas
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Data
2001-06
Autores
Aparecido, Christiane Ceriani [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Com o objetivo de se estudar aspectos da biologia de Puccinia psidii foram avaliadas a virulência em plantas diferenciadoras através de inoculações cruzadas, as temperaturas propícias à infecção dos hospedeiros, formação de soros teliais, produção de basidiosporos e germinação de urediniosporos com idades distintas e coletados de diferentes hospedeiros. Pôde-se constatar que temperaturas amenas favoreceram todo o ciclo vital do patógeno uma vez que, quando as mesmas variaram de 150 a 230C beneficiaram a infecção, induziram à elevada produção de soros teliais e basidiosporos, além de beneficiar a germinação de urediniosporos. Com relação aos urediniosporos, também pôde-se verificar que a idade dessas estruturas tem papel fundamental no aumento da porcentagem de germinação: urediniosporos com 14 dias, coletados de jambeiro e submetidos a 210C, apresentaram cerca de 37% de germinação, enquanto que para as estruturas com 21 dias, provenientes de goiabeira e expostas a 150C foi registrada porcentagem de germinação em torno de 35%, taxas consideradas bastante elevadas. Além disso, observando os dados anteriores, dependendo do hospedeiro do qual são coletados, podem haver diferenças fisiológicas que resultam em comportamento diferencial frente a temperatura a qual são expostos. A existência de variabilidade fisiológica dentro de populações de P. psidii foi constatada por meio de inoculações cruzadas. Foram obtidos quatro grupos devido à compatibilidade das reações, sendo que a principal diferença foi observada na intensidade das interações. Foram realizadas tentativas para a obtenção de culturas axênicas do microrganismo, porém os resultados foram negativos. Observações da evolução da ferrugem em campo, durante os anos de 1999 e 2000, permitiram verificar a ocorrência dos maiores picos em fevereiro... .
Concerning the studies of Puccinia psidii (Myrtaceae rust) biology were appraised the patogenicity in differentiating plants, the most favorable temperatures to the infection of the hosts, formation of telial sori, basidiospores production and urediniospores germination with different ages and collected from different hosts. It could be verified that mild temperatures favored the whole vital cycle of the pathogen once, when the same ones varied from 150 to 230C benefited the infection, induced to the telial sori formation and high basidiospore production. Besides increased the urediniospores germination. Regarding the urediniospores, it could also be verified that the age of those structures have fundamental paper in the percentage germination increase: urediniospores with 14 days, collected from apple rose (jambos) and submitted to 210C, presented about 37% of germination. For the structures with 21 days, coming from guava plants and exposed to 150C was registered germination percentage around 35%. Both taxes are considered quite high. Beyond, remarking the previous data, depending on the host which urediniospores are collected can have physiologic differences that result in distinct behavior at the temperature which they are exposed. The existence of physiologic variability inside Puccinia psidii populations was verified through crossed inoculations. Were obtained four groups due to the compatibility reactions, and the main difference was observed in the interactions severity of the disease. Attempts were accomplished for obtaining the rust axenic cultures, however the results were negative. Evolution observations of the rust in field, during the years of 1999 and 2000, allowed to verify the largest picks of occurrence in February (guava plants), in March (Eucalyptus cloeziana) and in April (apple rose, E. urophila, E. botryodes and E. grandis from Itatinga and Anhembi)... (Complete abstract, click electronic address below).
Concerning the studies of Puccinia psidii (Myrtaceae rust) biology were appraised the patogenicity in differentiating plants, the most favorable temperatures to the infection of the hosts, formation of telial sori, basidiospores production and urediniospores germination with different ages and collected from different hosts. It could be verified that mild temperatures favored the whole vital cycle of the pathogen once, when the same ones varied from 150 to 230C benefited the infection, induced to the telial sori formation and high basidiospore production. Besides increased the urediniospores germination. Regarding the urediniospores, it could also be verified that the age of those structures have fundamental paper in the percentage germination increase: urediniospores with 14 days, collected from apple rose (jambos) and submitted to 210C, presented about 37% of germination. For the structures with 21 days, coming from guava plants and exposed to 150C was registered germination percentage around 35%. Both taxes are considered quite high. Beyond, remarking the previous data, depending on the host which urediniospores are collected can have physiologic differences that result in distinct behavior at the temperature which they are exposed. The existence of physiologic variability inside Puccinia psidii populations was verified through crossed inoculations. Were obtained four groups due to the compatibility reactions, and the main difference was observed in the interactions severity of the disease. Attempts were accomplished for obtaining the rust axenic cultures, however the results were negative. Evolution observations of the rust in field, during the years of 1999 and 2000, allowed to verify the largest picks of occurrence in February (guava plants), in March (Eucalyptus cloeziana) and in April (apple rose, E. urophila, E. botryodes and E. grandis from Itatinga and Anhembi)... (Complete abstract, click electronic address below).
Descrição
Palavras-chave
Puccina psidii, Mirtacea, Fungos - Ecologia
Como citar
APARECIDO, Christiane Ceriani. Estudos ecológicos sobre Puccinia psidii winter - ferrugem das mirtáceas. 2001. x, 65 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas, 2001.