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

Rasera, Júlia Boscariol; Amorim, Lílian; Appezzato‐da‐Glória, Beatriz

doi:10.1007/s10658-021-02413-6

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…The temperature range for germination of N . tropicalis urediniospores is 10–35°C, and 80% of urediniospore germination on the leaf surface occurs between 20 and 30°C (Rasera et al, 2022). However, the amount of necrotic tissue in addition to sporulating pustules by the end of the experiments was higher at 25°C than 30°C.…”

Section: Discussionmentioning

confidence: 99%

“…In the literature, the temperature range for germination of N . tropicalis urediniospores is 20–30°C with an optimum of 25°C (Rasera et al, 2022). Grapevine rust shows a shorter latent period and higher disease severity when infected grapevines are grown at 30°C compared to 20°C (Alves, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Histopathological studies of the host-pathogen interaction (Marques et al, 2016(Marques et al, , 2018 and determination of monocyclic components such as infection rate, incubation and latent period and disease severity, can improve our understanding of polycyclic pathogens under varying environmental conditions (Teng et al, 1977). In the literature, the temperature range for germination of N. tropicalis urediniospores is 20-30°C with an optimum of 25°C (Rasera et al, 2022). Grapevine rust shows a shorter latent period and higher disease severity when infected grapevines are grown at 30°C compared to 20°C (Alves, 2015).…”

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Damage on grapevine cv. Niagara Rosada leaves caused by the combined effect of temperature and Asian grapevine leaf rust (Neophysopella tropicalis)

et al. 2023

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Asian grapevine leaf rust (AGLR), caused by Neophysopella tropicalis, is a problem for viticulture, especially in latitudes lower than 25° S, which include the most significant production regions in Brazil. Climate change has raised new concerns in agriculture as temperature can affect the resistance of plants to pathogens. With the aim of understanding how air temperature rise affects the AGLR pathosystem, measurements of leaf gas exchange and epidemiological and histopathological analyses were carried out on control and inoculated leaves of Vitis labrusca ‘Niagara Rosada’ grown at 25°C and 30°C. The lesion density and rust severity were higher at 25°C than 30°C, and the ratio between adaxial surface necrosis and the abaxial surface area occupied by pustules was >1 only at 30°C, presenting a necrosis not associated to the pathogen lesion. In fact, leaf necrosis was identified on control plants kept at 30°C and associated with gerontoplasts, representing accelerated leaf senescence. The AGLR pathogen reduced gas exchange and photosystem II activities at 25°C, with no difference between control and inoculated plants at 30°C. Our results indicate that AGLR is sensitive to increasing air temperature. However, the accelerated leaf senescence caused by the combination of N. tropicalis infection and temperature on Niagara Rosada can lead to high leaf damage.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Damage on grapevine cv. Niagara Rosada leaves caused by the combined effect of temperature and Asian grapevine leaf rust (Neophysopella tropicalis)

et al. 2023

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The Role of Fatty Acids from Plant Surfaces in the Infectivity of Colletotrichum fioriniae

Waller,

Häggblom,

Oudemans

2023

Phytopathology®

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Aqueous extracts derived from flowers stimulate germination, secondary conidiation, and appressorial formation of various latent fruit rotting fungi. Even raindrops passing over flowers accumulate sufficient activity to influence the infectivity of fruit rotting fungi. Using a spore germination bioassay, high levels of bioactivity were found in chloroform extracts from plant tissues, implicating the nonpolar components of the cuticle. The fatty acid (FA) and fatty acid methyl ester (FAME) composition (C9-C20) of blueberry and cranberry tissues as well as aqueous flower extracts were characterized using a gas chromatography-mass spectrometry (GC-MS) method. The FAs and FAMEs found in the plant extracts were then tested for bioactivity using a spore germination bioassay. The C16:0 and C18:2 FAs and FAMEs, as well as the C18:0 FAME and the C20:0 FA, all stimulated appressorial formation while the C10:0 FA stimulated secondary conidiation. The C10:0 and C16:0 FAs were the only two bioactive components also identified from the aqueous floral extracts of both blueberry and cranberry and are therefore considered as contributors to the bioactivity observed in these extracts. The aqueous extracts from surfaces other than flowers showed little or no activity, and it is speculated that the movement of FAs may be related to the level of polymerization and cutin polyester development in flowers versus other plant organs. This study highlights the importance of the bloom period for infection and that the apparent effects on host susceptibility may therefore depend on the availability of specific FAs or combinations thereof.

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Variations Among Crop Seasons and Inoculum Availability Have a Higher Impact on Grapevine Rust Epidemics than Training Systems or Plastic Cover

Dutra,

de Camargo,

Navas-Cortés

et al. 2024

Phytopathology®

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Canopy management practices can be effective as part of the integrated management of grapevine diseases. This study aimed to determine whether training systems and plastic covers can contribute to prevent Asian Grapevine Leaf Rust (AGLR) development. Additionally, the influence of crop season and inoculum availability on AGLR development was investigated. Six-season experiments were carried out to characterize 16 epidemics that developed from natural (NI) or artificial inoculum sources (NI+AI), conducted in different training systems and with or without the plastic cover. The Richards model was fitted to each AGLR disease progress curve to estimate and compare the onset and intensity of epidemics using eight curve elements. Principal components analysis (PCA) identified the incidence progress rate, the area under severity progress curve, final disease severity, time to disease onset, and time to reach the inflection point as the main descriptors for AGLR epidemics. The results showed that AGLR epidemic development was related mainly to differences in inoculum availability and climatic conditions throughout the seasons and to a lower extent to the training system and plastic cover. The earliest disease onset was observed in epidemics when the natural inoculum was supplemented with an artificial inoculum source. Differences in AGRL intensity were correlated to accumulated precipitation, being less severe in autumn-winter than in the spring-summer season. The present findings provided a better understanding of the structure and the seasonal variation of AGLR in ‘Niagara Rosada’. The strategies for reducing and/or delaying inoculum build-up among seasons were discussed.

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

Cited by 3 publications

References 28 publications

Damage on grapevine cv. Niagara Rosada leaves caused by the combined effect of temperature and Asian grapevine leaf rust (Neophysopella tropicalis)

Damage on grapevine cv. Niagara Rosada leaves caused by the combined effect of temperature and Asian grapevine leaf rust (Neophysopella tropicalis)

The Role of Fatty Acids from Plant Surfaces in the Infectivity of Colletotrichum fioriniae

Variations Among Crop Seasons and Inoculum Availability Have a Higher Impact on Grapevine Rust Epidemics than Training Systems or Plastic Cover

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