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| BOMFETI, C. A.; SOUZA-PACCOLA, E. A.; MASSOLA JUNIOR, N. S.; MARRIEL, I. E.; MEIRELLES, W. F.; CASELA, C. R.; PACCOLA-MEIRELLES, L. D.. |
| The etiological agent of maize white spot (MWS) disease has been a subject of controversy and discussion. Initially the disease was described as Phaeosphaeria leaf spot caused by Phaeosphaeria maydis. Other authors have suggested the existence of different fungal species causing similar symptoms. Recently, a bacterium, Pantoea ananatis, was described as the causal agent of this disease. The purpose of this study was to offer additional information on the correct etiology of this disease by providing visual evidence of the presence of the bacterium in the interior of the MWS lesions by using transmission electron microscopy (TEM) and molecular techniques. The TEM allowed visualization of a large amount of bacteria in the intercellular spaces of lesions... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Milho; Zea mays; Doença bacteriana do milho; Doenças foliares do milho; Maize bacterial disease; Maize leaf disease. |
| Ano: 2008 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/491172 |
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| SOUZA-PACCOLA, E. A de; BOMFETI, C. A.; TANAKA, F. A. O.; MASSOLA JUNIOR, N. S.; COLAUTO, N. B.; FIGUEIREDO, J. E. F.; PACCOLA-MEIRELLES, L. D.. |
| Anthracnose, caused by Colletotrichum sublineolum Henn. ex Sacc. & Trotter, is one of the most important sorghum [Sorghum bicolor (L.) Moench] diseases in Brazil. This fungus exhibits conidial dimorphism, producing either falcate or oval conidia on solid and liquid media, respectively. We compared patterns of the initial infection events by these two types of conidia on sorghum leaves using light microscopy and scanning electron microscopy. The infection events during the first 24 h were similar for both oval and falcate conidia. Globose and melanized apressoria were formed at 24 h after inoculation (hai) regardless of the conidia type. Dense mycelium and oval conidia developed from germinated falcate conidia at 32 hai. Hyphal mass displaying acervuli... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Sorghum bicolor; Antracnose. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1015414 |
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| FURTADO, G. Q.; MORAES, S. R. G.; ALVES, S. A. M.; AMORIM, L.; MASSOLA JUNIOR, N. S.. |
| The ability of Phakopsora pachyrhizi to cause infection under conditions of discontinuous wetness was investigated. In in vitro experiments, droplets of a uredospore suspension were deposited onto the surface of polystyrene. After an initial wetting period of either 1, 2 or 4 h, the drops were dried for different time intervals and then the wetness was restored for 11, 10 or 8 h. Germination and appressorium formation were evaluated. In in vivo experiments, soybean plants were inoculated with a uredospore suspension. Leaf wetness was interrupted for 1, 3 or 6 h after initial wetting periods of 1, 2 or 4 h. Then, the wetting was re-established for 11, 10 or 8 h, respectively. Rust severity was evaluated 14 days after inoculation. The germination of the... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Soja; Doença de planta; Ferrugem; Fungo; Umidade; Folha. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/877741 |
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