Temperature requirements for germination, germ tube growth and appressorium formation of urediospores of Hemileia vastatrix

Jong, E.J. de; Eskes, A. B.; Hoogstraten, J. G. J.; Zadoks, J.C.

doi:10.1007/bf01998091

Cited by 22 publications

(33 citation statements)

References 4 publications

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“…Rain and wind assist spore dispersal, while germination is inhibited by solar radiation. As with many fungal foliar pathogens [7], germination of uredospores on the leaf surface and subsequent entry into via stomata requires the presence of liquid water and temperatures within a particular range [32–34]. Here, we focus on modelling the processes of spore germination and infection in relation to leaf wetness and temperature, in our estimation of disease risk.…”

Section: Methodsmentioning

confidence: 99%

Modelling coffee leaf rust risk in Colombia with climate reanalysis data

Bebber

Castillo

Gurr

2016

Phil. Trans. R. Soc. B

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Many fungal plant diseases are strongly controlled by weather, and global climate change is thus likely to have affected fungal pathogen distributions and impacts. Modelling the response of plant diseases to climate change is hampered by the difficulty of estimating pathogen-relevant microclimatic variables from standard meteorological data. The availability of increasingly sophisticated high-resolution climate reanalyses may help overcome this challenge. We illustrate the use of climate reanalyses by testing the hypothesis that climate change increased the likelihood of the 2008–2011 outbreak of Coffee Leaf Rust (CLR, Hemileia vastatrix) in Colombia. We develop a model of germination and infection risk, and drive this model using estimates of leaf wetness duration and canopy temperature from the Japanese 55-Year Reanalysis (JRA-55). We model germination and infection as Weibull functions with different temperature optima, based upon existing experimental data. We find no evidence for an overall trend in disease risk in coffee-growing regions of Colombia from 1990 to 2015, therefore, we reject the climate change hypothesis. There was a significant elevation in predicted CLR infection risk from 2008 to 2011 compared with other years. JRA-55 data suggest a decrease in canopy surface water after 2008, which may have helped terminate the outbreak. The spatial resolution and accuracy of climate reanalyses are continually improving, increasing their utility for biological modelling. Confronting disease models with data requires not only accurate climate data, but also disease observations at high spatio-temporal resolution. Investment in monitoring, storage and accessibility of plant disease observation data are needed to match the quality of the climate data now available.This article is part of the themed issue ‘Tackling emerging fungal threats to animal health, food security and ecosystem resilience’.

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Section: Methodsmentioning

confidence: 99%

Modelling coffee leaf rust risk in Colombia with climate reanalysis data

Bebber

Castillo

Gurr

2016

Phil. Trans. R. Soc. B

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“…A maioria dos trabalhos cita temperaturas entre 22 o C a 24ºC como ideais para ocorrer maior porcentagem de germinação de urediniósporos. Segundo Dejong et al (1987), Rayner (1972) e Saccas & Charpentier (1971), a 22ºC ocorre a máxima porcentagem de germinação, porém, na literatura encontram-se outros valores. Dejong et al (1987) citam, a 22ºC, 64% de germinação.…”

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“…Segundo Dejong et al (1987), Rayner (1972) e Saccas & Charpentier (1971), a 22ºC ocorre a máxima porcentagem de germinação, porém, na literatura encontram-se outros valores. Dejong et al (1987) citam, a 22ºC, 64% de germinação. Segundo Akutsu (1981), a 25ºC ocorreram 100% de germinação e completa inibição a 32,5ºC e 12,5ºC, enquanto Montoya & Chaves (1974) citam, sob temperatura de 24ºC, a máxima porcentagem de germinação, ou seja, 23,66%.…”

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“…As temperaturas mínimas médias noturnas estiveram, em média, a 18ºC em Coromandel e Viçosa, a 16ºC em Lavras, Cajuri e São Miguel do Anta e a 14ºC em Ijaci (BRASIL, 2005;OLIVEIRA, 2005). Portanto, a diferença entre as temperaturas ótimas para germinação encontrada por Akutsu (1981), Dejong et al (1987), Montoya & Chaves (1974), Nutman & Roberts (1963), Rayner (1972) e Saccas & Charpentier (1971), pode ser devido à variabilidade entre populações, as quais foram selecionadas de acordo com o microclima de cada região.…”

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“…Para determinadas PHVs, a temperatura acima de 20ºC pode comprometer ou desacelerar o processo germinativo. As condições favoráveis à germinação nem sempre são favoráveis ao crescimento do tubo germinativo que, de acordo com Coutinho et al (1993) e Dejong et al (1987), deve ser, no mínimo, de 100mm para alcançar os estômatos, eqüidistantes 70mm no café arábica. O comprimento máximo do tubo de CO2 chegou a 24mm, valor considerado baixo, no entanto, apresentou altos valores de germinação.Há, portanto, necessidade de seleção criteriosa das zonas geográficas cafeicultoras, a fim de caracterizar a variabilidade das populações de H. vastatrix, para melhor compreensão da dinâmica de suas populações, bem como, da sua evolução.…”

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Variabilidade em dez populações de Hemileia vastatrix em relação à germinação e ao comprimento do tubo germinativo em quatro temperaturas

et al. 2008

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RESUMONeste trabalho, objetivou-se verificar o efeito da temperatura na germinação e no comprimento do tubo germinativo em diferentes populações de H. vastatrix (PHVs), sob quatro temperaturas. Realizou-se um bioensaio com dez PHVs, com suspensão de urediniósporos a 0,5mg/mL em solução aquosa (0,05%) de tween 80. Duas gotas de cada suspensão foram depositadas em lâminas de microscópio recobertas com camada de poliestireno e colocadas em gerbox contendo papel de filtro umedecido para constituir câmara úmida. Os gerboxes foram mantidos fechados, no escuro, a 15o C e 30ºC, por 24 horas. O ensaio foi conduzido em fatorial 10 x 4, sendo dez isolados, quatro temperaturas e duas repetições. Avaliaram-se a germinação e o comprimento do tubo germinativo. Houve variabilidade entre as PHVs quanto à temperatura ótima para germinação e alongamento do tubo germinativo.Termos para indexação: Ferrugem, Coffea arabica, populações. ABSTRACTThe objective of this work was to verify the effect of temperature in germination and germ tube length in different populations of H. vastatrix (PHVs) temperatures. A bioassay was performed with ten PHVs, using an urediniospore suspension of at 0.5mg/mL in aqueous solution (0.05%) of tween 80. Two drops of each suspension was deposited on a microscope coverslip, covered with a polystyrene layer and incubated in gerbox containing a watered filter paper to work as a wet chamber. The gerbox was kept closed, in the dark, at 15, 20, 25 and 30ºC for 24 hours. The assay was carried out in a factorial design 10 x 4, with ten isolates, four temperatures and two replicates represented by two drops of the suspension. Germination percentage and germ tube length were assessed. There was variability among PHVs for the optimum temperature for germination and elongation of the germ tube.

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Jan Carel Zadoks, Professor in Ecological Plant Pathology, Wageningen Agricultural University

Dekker

1993

Neth. J. Pl. Path.

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Temperature requirements for germination, germ tube growth and appressorium formation of urediospores of Hemileia vastatrix

Cited by 22 publications

References 4 publications

Modelling coffee leaf rust risk in Colombia with climate reanalysis data

Modelling coffee leaf rust risk in Colombia with climate reanalysis data

Variabilidade em dez populações de Hemileia vastatrix em relação à germinação e ao comprimento do tubo germinativo em quatro temperaturas

Jan Carel Zadoks, Professor in Ecological Plant Pathology, Wageningen Agricultural University

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