Efeito da temperatura e da luz na germinação de urediniósporos de Phakopsora euvitis

Angelotti, Francislene; Tessmann, Dauri José; Scapin, Cláudia Regina; Vida, João Batista

doi:10.1590/s0100-54052011000100009

Cited by 6 publications

(4 citation statements)

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“…Teliospores germinate in a large range of temperatures (10–30 °C) although the optimum temperatures for teliospore germination and basidiospore formation range from 15 to 25 °C (Edwards, ). Urediniospores germinate by a single germ tube and also at a wide range of temperatures (5–40 °C), although germination rates higher than 20% are observed only between 10 and 25 °C in the dark (Naruzawa et al ., ; Angelotti et al ., ). Whilst germination is favoured by the dark, it is not completely inhibited at low light intensities (Leu & Wu, ; Naruzawa et al ., ; Angelotti et al ., ).…”

Section: Plant Infectionmentioning

confidence: 97%

“…Urediniospores germinate by a single germ tube and also at a wide range of temperatures (5–40 °C), although germination rates higher than 20% are observed only between 10 and 25 °C in the dark (Naruzawa et al ., ; Angelotti et al ., ). Whilst germination is favoured by the dark, it is not completely inhibited at low light intensities (Leu & Wu, ; Naruzawa et al ., ; Angelotti et al ., ). Urediniospores of P. euvitis are able to germinate on different, even artificial, surfaces, but germination rates are highest on grapevine leaves (Naruzawa et al ., ).…”

Section: Plant Infectionmentioning

confidence: 97%

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Asian grapevine leaf rust caused by Phakopsora euvitis: an important disease in Brazil

Primiano¹,

Loehrer

Amorim³

et al. 2017

Plant Pathology

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Anthropogenic influences such as tourism and climate change affect ecosystems. One consequence is that invasive species can spread to and colonize novel areas. A recent example of this scenario is the appearance, in the early 2000s in Brazil and Australia, of the plant pathogenic fungus Phakopsora euvitis, which causes Asian grapevine leaf rust. It is speculated that the disease was introduced either by long distance transport of spores in the atmosphere or the import of contaminated plant material. While the disease could be eradicated from the Australian continent it is still present in Brazil. The pathogen has spread successfully throughout most Brazilian grapevine-growing regions, most probably because of the lack of resistant plant cultivars. Today, the disease is endemic in Brazil. This review was written to highlight the increasing impact of the disease in Brazil and summarizes the current knowledge on the disease monocycle under different environmental conditions and the consequences for grapevine management. Gaps in the present state of knowledge are highlighted with the purpose of stimulating further research aimed at identifying efficient strategies to combat the disease.

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Section: Plant Infectionmentioning

confidence: 97%

Section: Plant Infectionmentioning

confidence: 97%

Asian grapevine leaf rust caused by Phakopsora euvitis: an important disease in Brazil

Primiano¹,

Loehrer

Amorim³

et al. 2017

Plant Pathology

View full text Add to dashboard Cite

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“…A disseminação do patógeno atinge longas distâncias por correntes de vento e P. euvitis infecta as folhas em ampla faixa de temperatura (Leu, 1988;Navarro et al, 2015). A germinação dos urediniósporos é favorecida pelo escuro, embora não seja completamente inibida em baixas intensidades luminosas (Angelotti et al, 2011;Leu & Wu, 1983;Naruzawa et al, 2006). O intervalo de temperatura em que a germinação ocorre é amplo (5 -40 o C), porém taxas superiores a 20% de germinação são observadas apenas entre 10 e 25 o C (Angelotti et al, 2011;Naruzawa et al, 2006).…”

Section: Ferrugem Da Videiraunclassified

“…A dispersão de urediniósporos ocorre principalmente pelo vento e a alta umidade e escuro favorecem a germinação de urediniósporos . O período de latência varia de 6 a 13 dias na cultivar Niagara Rosada (V. labrusca), dependendo da temperatura (Angelotti et al, 2011 . Valores elevados de lesões virtuais foram encontrados para Pyricularia oryzae-arroz , Mycosphaerella pinodes-ervilha seca…”

Section: Introductionunclassified

Quantificação e modelagem de mecanismos de danos causados por Phakopsora euvitis e Plasmopara viticola em videira Vitis labrusca

Júnior¹,

Fernandes²

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Quantification and modelling of damage mechanisms caused by Phakopsora euvitis and Plasmopara viticola in Vitis labrusca Viticulture in Brazil and in the state of São Paulo has increased in the last 10 years and cv. Niagara Rosada (Vitis labrusca) is the main cultivar for the production of table grapes. This cultivar is susceptible to several foliar diseases, such as rust (Phakopsora euvitis) and downy mildew (Plasmopara viticola). There are no quantitative estimates of the damage caused by these pathogens in cv. Niagara Rosada. The objectives of this work were to quantify the effects of rust and downy mildew on gas exchange, photosynthesis limitations, biomass accumulation, carbohydrate accumulation and production of cv. Niagara Rosada and to develop a simulation model for V. labrusca coupled with damage mechanisms caused by rust and mildew. Experiments were conducted, independently for each disease, under controlled conditions in potted plants inoculated with different concentrations of P. euvitis and P. viticola and in experimental field, with natural occurrence of diseases. Measurements of gas exchange and response curves of photosynthetic rate to the increase of the intercellular CO 2 concentration (Ci) were carried out in healthy plants and infected plants with P. euvitis and P. viticola. Total soluble sugars, sucrose and starch contents were determined in healthy plants and inoculated plants with the pathogens and kept under controlled conditions. P. euvitis and P. viticola reduced the photosynthetic rate in infected plants both in the area of the lesion and in the green tissue adjacent to the lesion (virtual lesion). Values of parameter β, indicative of the virtual lesion, were 5.8 and 2.9, respectively for P. euvitis and P. viticola. P. euvitis reduced the activity of Rubisco (V cmax), rate of electrons transport contributing for the RuBP-regeneration (J max) and the conductance of mesophyll (g m), respectively, on infected leaves by 48%, 36% and 67%. The severity of P. euvitis reduced leaf area and biomass of plant roots. The histopathological analysis and starch quantification in the leaves allowed to observe starch accumulation in regions adjacent to the pustules of P. euvitis. Even in low disease severities, reductions in carbohydrates accumulation of in roots are already observed. P. viticola reduced V cmax by 23.5% in infected leaves compared to healthy leaves. P. viticola reduced the root biomass and carbohydrate amounts in the roots of potted plants and plants in the field in the year of high disease severity. Field plants with mildew symptoms produced on average 0.5 kg less than healthy plantsand the main cause of reduction in production was the drop of berries caused by infection of P. viticola in the clusters. A simulation model for Vitis labrusca was developed using Stella ® software. The production, partitioning and dynamics of grapevine biomass was simulated over 20 years and the effects of P. euvitis and P. viticola on the reduction of healthy green plant tissue and photosynthetic efficien...

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Diverse effects of temperature on in vivo and in vitro germination of urediniospores of Neophysopella tropicalis

2021

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Efeito da temperatura e da luz na germinação de urediniósporos de Phakopsora euvitis

Cited by 6 publications

References 4 publications

Asian grapevine leaf rust caused by Phakopsora euvitis: an important disease in Brazil

Asian grapevine leaf rust caused by Phakopsora euvitis: an important disease in Brazil

Quantificação e modelagem de mecanismos de danos causados por <i>Phakopsora euvitis</i> e <i>Plasmopara viticola</i> em videira <i>Vitis labrusca</i>

Diverse effects of temperature on in vivo and in vitro germination of urediniospores of Neophysopella tropicalis

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