Effects of UV and Phototoxins on Selected Fungal Pathogens of Citrus

Asthana, A.; Tuveson, R. W.

doi:10.1086/297050

Cited by 33 publications

(18 citation statements)

References 27 publications

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“…The protective effect of melanins and melanin-like pigments against conventional antifungal drugs [61][62][63] and also to APDT [64][65][66][67] was observed previously both in conidia and in vegetative yeast cells. Pigmented conidia of Penicillium and Metarhizium are much more resistant to APDT with different PS than the colorless mutants [65][66]. In yeasts, Cryptococcus neoformans melanized cells are more resistant to APDT than the nonmelanized cells [64,67].…”

Section: Discussionsupporting

confidence: 62%

In vitro susceptibilities of Neoscytalidium spp. sequence types to antifungal agents and antimicrobial photodynamic treatment with phenothiazinium photosensitizers

et al. 2018

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In vitro susceptibilities of Neoscytalidium spp. sequence types to antifungal agents and antimicrobial photodynamic treatment with phenothiazinium photosensitizers http://researchonline.ljmu.ac.uk/7434/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Users may download and/or print one copy of any article(s) in LJMU Research Online to facilitate their private study or for non-commercial research. You may not engage in further distribution of the material or use it for any profit-making activities or any commercial gain.The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription.

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Section: Discussionsupporting

confidence: 62%

In vitro susceptibilities of Neoscytalidium spp. sequence types to antifungal agents and antimicrobial photodynamic treatment with phenothiazinium photosensitizers

et al. 2018

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“…Due to this property and its free radical state, melanin has the ability to protect the cell against the reducing and oxidizing conditions, which might otherwise set reactive free radicals capable of disrupting metabolism. In many cases, it has been suggested that pigments in fungi are the main protective mechanisms against UV radiation [25,28]. Therefore, exposure to UV radiation may not have a lethal effect on fungal propagules; however, it may cause changes in their metabolic activity.…”

Section: Discussionmentioning

confidence: 99%

Resistance of airborne fungal propagules to ultraviolet irradiation: Laboratory study

Ulevičius¹

2008

Lithuanian J. Phys.

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The influence of ultraviolet (UV) radiation on fungi Aspergillus niger Tiegh. isolate OG168, Paecilomyces puntonii (Vuill.) Nann. isolate OG68, and Penicillium expansum Link isolate PO88 was studied under laboratory conditions. A test system was developed for this study. An aerosol chamber provided a dust-free space of 1.5 m 3 . The source of ultraviolet rays was an UV lamp (DPT 220, 240-320 nm, 15 W). Fungal propagules were injected into the UV exposed chamber space from an external bioaerosol generator. Aerosols from the aerosol chamber after irradiation to UV were sampled into an impinger AGI-30 and measured with the optical aerosol spectrometer LAS-15M (Institute of Physics, Lithuania). The changes in fungi survival caused by exposure to UV radiation were evaluated by determining their relative recovery. The laboratory study indicated that the fungal propagules responded to UV radiation distinctively. P. puntonii propagules were injured without possibility to repair. On the contrary, P. expansum propagules repaired after a long enough exposure to UV radiation, but this ability was limited. The stressed A. niger propagules recovered after the 80 min exposure to UV radiation and the relative recovery reached a plateau. The mutagenic effects of UV light on tested fungi have shown that frequent occurrence of different morphological mutants was detected after the 30 min exposure of conidia. The mean geometrical diameter of fungal propagules exposed to UV irradiation in the aerosol chamber was in the range of 2.5 to 2.8 µm.

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“…Although various effects of UVR on fungi have been reported 7,8,9 including the germicidal UV light effects 10,11,12 , there is scarcity of data with respect to the specific doses of UV germicidal irradiation that inactivate or are lethal to fungi, in the literature. Also, reports of UV effects specifically concerning the Aspergillus spp.…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral imaging of UVR effects on fungal spectrum

Hruska

Yao

DiCrispino

et al. 2005

Ultraviolet Ground- And Space-Based Measurements, Models, and Effects V

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The present report evaluated ultraviolet radiation (UVR) effects on the spectral signature of mycotoxin producing fungus Aspergillus flavus (A. flavus). Ultraviolet radiation has long been used to reduce microbe contamination and to inactivate mold spores. In view of the known effects of UVR on microorganisms, and because certain spectral bands in the signature of some fungi may be in the UV range, it is important to know the maximum acceptable limit of UVR exposure that does not significantly alter the fungal spectral signature and affect detection accuracy. A visible-nearinfrared (VNIR) hyperspectral imaging system using focal plane pushbroom scanning for high spatial and spectral resolution imaging was utilized to detect any changes. A. flavus cultures were grown for 5 days and imaged after intermittent or continuous UVR treatment. The intermittent group was treated at 1-minute intervals for 10 minutes, and VNIR images were taken after each UVR treatment. The continuous group was irradiated for 10 minutes and imaged before and after treatment. A control sample group did not undergo UVR treatment, but was also imaged at 1-minute intervals for 10 minutes in the same manner as the intermittent group. Before and after UVR treatment, mean fungal sample reflectance was obtained through spatial subset of the image along with standard deviation and pre-and posttreatment reflectance was compared for each sample. Results show significant difference between the reflectances of treated and control A. flavus cultures after 10 min of UV radiation. Aditionally, the results demonstrate that even lethal doses of UVR do not immediately affect the spectral signature of A. flavus cultures suggesting that the excitation UV light source used in the present experiment may be safe to use with the UV hyperspectral imaging system when exposure time falls below 10 min.

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Effects of UV and Phototoxins on Selected Fungal Pathogens of Citrus

Cited by 33 publications

References 27 publications

In vitro susceptibilities of Neoscytalidium spp. sequence types to antifungal agents and antimicrobial photodynamic treatment with phenothiazinium photosensitizers

In vitro susceptibilities of Neoscytalidium spp. sequence types to antifungal agents and antimicrobial photodynamic treatment with phenothiazinium photosensitizers

Resistance of airborne fungal propagules to ultraviolet irradiation: Laboratory study

Hyperspectral imaging of UVR effects on fungal spectrum

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