First Report of<i>Melampsora medusae</i>on<i>Populus deltoides</i>in Africa

Trench, T. N.; Baxter, Alice P.; Churchill, H.

doi:10.1080/00382167.1988.9630310

Cited by 7 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Por (15). Para M. medusae variações no tamanho devido ao hospedeiro e a região também são possíveis (8).…”

Section: Diferenças Entre Os Urediniósporos (Ornamentação Tamanho E unclassified

Metodologias de preparação de amostras de ferrugem para estudos morfológicos de urediniósporos por meio de microscopia eletrônica de varredura

Mio¹,

Novaes²,

Alves³

2006

Summa phytopathol.

View full text Add to dashboard Cite

Samples from Urediniospores of some rust fungi such as Melampsora epitea, Melampsora medusae, Hemileia vastatrix, Uromyces appendiculatum, Puccinia sorghi, Tranzschelia discolor and Phakopsora euvitis respectively from Salix sp., Populus deltoides, Coffea arabica, Phaseolus vulgaris, Zea mays, Prunus persicae and Vitis vinifera, were processed by three different methodologies for scanning electron microscopy (SEM) observations. These methodologies were: a) conventional methodology (glutaraldehyde and osmium tetroxide fixation, dehydrated in an acetone series, dried in a critical point dryer and sputtered with gold); b) fixation using osmium tetroxide vapor technique and sputtering with gold and c) direct sputtered of the samples with gold (with free urediniospores).May De Mio, L. L.; Novaes, Q. S; Alves E. Methodologies processed of some rusts fungi by scanning electron microscopy. Summa Phytopathologica, v.32, n.3, p.267-273, 2006.Also fractures of leaf sample frozen in liquid nitrogen were used to observe details within the uredia from grape rust (P. euvitis). The samples were observed in a scanning electron microscope (SEM) LEO 435VP and the images were captured and recorded by using the software LeoUserInterface and processed with Corel Photopaint 9.0 software. The dimension of the urediniospores was also measured. Regardless of the technique the structure of the urediniospores were very well preserved resulting in images of high quality. However the technique of direct sputtering was more useful and quick to see the urediniospores. The liquid nitrogen fractures allowed a perfect observation from the interior of the grape rust uredia. RESUMOAmostras de urediniósporos de ferrugens das espécies Melampsora epitea Thum., Melampsora medusae Thuem., Hemileia vastatrix Berk., Uromyces appendiculatum Pers., Puccinia sorghi Schwein., Tranzschelia discolor Fuckel e Phakopsora euvitis Ono, coletadas dos hospedeiros, chorão (Salix sp.), álamo (Populus deltoides Bartr. Ex. Marsh), cafeeiro (Coffea arabica L.), feijoeiro (Phaseolus vulgaris L.), milho (Zea mays L.), pessegueiro (Prunus persicae L.) e videira (Vitis vinifera L.) respectivamente, foram processadas de 3 formas: a) método convencional (fixação em glutaraldeído e tetróxido de ósmio, desidratação em acetona e secagem ao ponto crítico); b) método do vapor de ósmio e metalização com ouro; c) metalização direta de amostras (utilizado para esporos soltos). A técnica de fratura de amostra congelada em nitrogênio líquido também foi testada para o estudo do interior de pústulas da ferrugem da videira (P. euvitis). As amostras foram visualizadas em microscópio eletrônico de varredura no NAP/ MEPA da ESALQ/USP. Procedeu-se à mensuração dos esporos e as imagens obtidas foram capturadas pelo software LeoUserInterface e processadas utilizando-se o programa de computador "Corel Draw". Em todos os métodos analisados obteve-se uma boa preservação da estrutura possibilitando imagens de alta qualidade. No entanto, para esporos livres (mantidos em cápsula de gelatina) o ...

show abstract

“…Por (15). Para M. medusae variações no tamanho devido ao hospedeiro e a região também são possíveis (8).…”

Section: Diferenças Entre Os Urediniósporos (Ornamentação Tamanho E unclassified

Metodologias de preparação de amostras de ferrugem para estudos morfológicos de urediniósporos por meio de microscopia eletrônica de varredura

Mio¹,

Novaes²,

Alves³

2006

Summa phytopathol.

View full text Add to dashboard Cite

show abstract

“…No entanto, naquela ocasião, não foi identificada a espécie do patógeno. RUARO & MAY (1996) identificaram a espécie que ocorre no Paraná de acordo com dados morfológicos dos urediniósporos (tamanho médio de urediniósporos de 20 -38 x 13 -21 µm com formato abovalado a oval, ápice arredondado e base truncada com parede externa saliente) como Melampsora medusae Thüm, em concordância com a descrição da literatura (WALKER, 1975;TRENCH et al, 1988). Esta identificação foi também confirmada pelo Dr. Mário Barreto Figueredo do Instituto Biológico de São Paulo.…”

Section: Manchas Foliares I1 Ferrugem Do áLamo -Melampsora Sppunclassified

Doenças do álamo

Mio¹,

Amorim²

2000

View full text Add to dashboard Cite

A cultura do álamo no Brasil, assim como no resto do mundo, enfrenta sérios desafios em relação a pragas e doenças. No que se refere a doenças, a ferrugem das folhas, causada por Melampsora medusae, é a mais importante da cultura. A doença provoca pústulas nas folhas, aonde são produzidos urediniósporos em grande número, responsáveis pela disseminação, podendo ocasionar epidemias no verão. Com o avanço da doença, a queda das folhas é antecipada, interferindo no crescimento da árvore e armazenamento de energia para o próximo ciclo. Além da ferrugem, outras manchas foliares como as causadas por Septoria, Alternaria tenuis e Colletotrichum gloeosporioides já foram detectadas no Brasil. A mancha de Septoria é a mais importante pois o patógeno causa cancros nos galhos e tronco das árvores. Também são relatadas na literatura manchas foliares causadas por Marssonina spp, Taphrina spp e Venturia spp, além de diversos cancros e algumas podridões radiculares. Abstract The poplar crop in Brazil, as in the rest of the world, has been attacked by a number of pests and diseases. The leaf rust, caused by Melampsora medusae is the most important disease. It causes pustules in leaves, which produces uredinospores in large quantities which spreads the disease causing epidemics in the summer time. After several cycles of the pathogen, the plant is early defoliated, grows poorly and retains less energy for the next year. Besides this disease, other leaf diseases caused by Septoria, Alternaria tenuis and Colletotrichum gloeosporioides have already been detected in Brazil. Leaf spot caused by S. musiva is the most important because the pathogen causes cankers in stems and branches. Other diseases have already been mentioned in different publications such as leaf spots caused by Marssonina spp, Taphrina spp, and Venturia spp, as well as several cankers and some root rot.

show abstract

“…(eastern cottonwood) and its hybrids (Arthur and Cummins 1962;Widin and Schipper 1980), is endemic to the eastern United States. It has been introduced into most areas where P. deltoides is planted, such as Australia (Walker et al 1974), France (Pinon 1973), New Zealand (Van Kraayenoord et al 1974), South Africa (Trench et al 1988), and the western United States (Newcombe and Chastagner 1993). A hybrid between M. medusae and Melampsora occidentalis H. Jacks.…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity of poplar leaf rust populations in the north-central United States

Harrington¹

2006

Can. J. For. Res.

View full text Add to dashboard Cite

Uredinia of poplar leaf rust, Melampsora medusae Thüm f.sp. deltoides, appeared in late July 1998, June 1999, and August 2000 in a cottonwood (Populus deltoides Bartr.) stand in Ames, Iowa. Seedlings of the alternate host (eastern larch, Larix laricina (Du Roi) K. Koch) set out at the site in spring 2000 formed aecia 3 months before uredinia appeared. Using three PCR-based microsatellite markers, the aecial population was genetically diverse and in Hardy–Weinberg equilibrium, typical of a population that had gone through sexual reproduction. Uredinia populations in 1998–2000 had lower levels of gene diversities (from 0.58 to 0.71) and were not in Hardy–Weinberg equilibrium. Of nine populations in Minnesota, Iowa, and Missouri during the early stage of the 1999 epidemic, the two populations with the highest gene diversity, the highest level of heterozygosity, and the greatest number of unique genotypes were within the natural geographic range of larch. However, the southernmost population in Missouri was also in Hardy–Weinberg equilibrium. Epidemics started sooner in Iowa than in Minnesota, which contradicts the hypothesis that epidemics begin in northern regions where the alternate hosts naturally overlap. Epidemics appeared to commence independently in the various locations, perhaps focused around areas where ornamental larch is in proximity to P. deltoides.

show abstract

First Report ofMelampsora medusaeonPopulus deltoidesin Africa

Cited by 7 publications

References 3 publications

Metodologias de preparação de amostras de ferrugem para estudos morfológicos de urediniósporos por meio de microscopia eletrônica de varredura

Metodologias de preparação de amostras de ferrugem para estudos morfológicos de urediniósporos por meio de microscopia eletrônica de varredura

Doenças do álamo

Genetic diversity of poplar leaf rust populations in the north-central United States

Contact Info

Product

Resources

About