D. Pečiulytė - Academia.edu (original) (raw)

Papers by D. Pečiulytė

Research paper thumbnail of Functioning of Ectomycorrhizae and Soil Microfungi in Deciduous Forests Situated Along a Pollution Gradient Next to a Fertilizer Factory

Ectomycorrhizae (ECM) and soil microfungi were studied in soil cores from seven unequally pollute... more Ectomycorrhizae (ECM) and soil microfungi were studied in soil cores from seven unequally polluted forest plots spaced at different distances from a fertilizer factory in Lithuania. The abundance of ECM roots and soil microfungi was visibly different in separate investigation plots. Average amount of ECM root tips during the investigation period (2000-2002) in different forests was from 134 to 1017

Research paper thumbnail of Resistance of airborne fungal propagules to ultraviolet irradiation: Laboratory study

Lithuanian Journal of Physics, 2008

The influence of ultraviolet (UV) radiation on fungi Aspergillus niger Tiegh. isolate OG168, Paec... more 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.

Research paper thumbnail of Microbiological Reduction of Monoethanolamine Waste Toxicity

Journal of Environmental Engineering and Landscape Management, 2011

Research paper thumbnail of Field study on changes in viability of airborne fungal propagules exposed to UV radiation

Environmental Toxicology, 2004

The responses of airborne fungi to UV-B under natural conditions were investigated at the coastal... more The responses of airborne fungi to UV-B under natural conditions were investigated at the coastal station in Preila, Lithuania. Results of this investigation demonstrated that solar radiation has a marked lethal effect on outdoor airborne fungi. Sensitivity to solar radiation was the highest for the fungal propagules collected late in the evening (relative recovery 6.2%) and early morning (25.3%). The lowest sensitivity to solar radiation was observed for fungal propagules collected at midday (50.0%) and in the afternoon (53.0%). The reason for the lethal effect is thought to be elimination of the sensitive fraction of the night-time fungal populations as solar radiation gradually increases beginning at dawn. Among 356 fungus strains isolated during the investigations, 128 can be characterized as potential pathogens, and 21 strains among those most common in fungal populations belonging to plant, animal, and human pathogen groups. The collected fungal populations were exposed to solar UV-B irradiation for 2 h (from 12 p.m. to 2 p.m.). Fungal communities in the air samples were composed of saprotrophs, some of which are regarded as potential phytopathogens (Alternaria, Cladosporium, and Fusarium) or as entomopathogens (Beauveria, Paecilomyces, and Metarhizium). The airborne fungal species identified after exposure to solar radiation were predominantly: Aspergillus niger, Alternaria alternata, Cladosporium cladosporioides, Arthrinium phaerosporum, and dematiaceous sterile mycelium.

Research paper thumbnail of Pine defoliator Bupalus piniaria L.(Lepidoptera: Geometridae) and its entomopathogenic fungi: 1. Fungi isolation and testing on larvae

Ekologija, 2010

Pine defoliator bordered white moth (pine looper), Bupalus piniaria L. (Lepidoptera: Geometridae)... more Pine defoliator bordered white moth (pine looper), Bupalus piniaria L. (Lepidoptera: Geometridae) larvae were reared under laboratory conditions and were regularly supplied with pine twigs collected in nature for feeding. Cadavers of naturally infected 2nd and 3rd stage larvae were collected and analysed. Th irty-six fungal isolates belonging to 15 species and 10 genera were obtained, cultivated and identifi ed. Among them two species prevailed: Lecanicillium psalliotae (syn. Verticillium psalliotae) and Fusarium solani, comprising respectively 34.6 and 24.3% of the total number of fungi isolates. Conidial suspensions of the two fungi species at concentrations 10 5 to 10 8 conidia/ml were tested. Only the highest concentration of F. solani induced the mortality of 4th instar larvae, although the virulence was low: accumulative mortality ranged from 29.6 to 30.7% aft er 10 days of spraying. In the control group, the mortality was 15.8% aft er the same period. Th e high percentage of cadavers containing one of the two fungal species and the low mortality recorded in the test could be due to the very diff erent sensitivity to the pathogens in diff erent stage larvae. Th is is the fi rst report on the isolation and identifi cation of fungi developing on B. piniaria.

Research paper thumbnail of Mikromicetai metalų korozijos procesuose atmosferos sąlygomis

Ekologija, 2005

... 1976; Gams, 1971; Hansworth et al., 1995; Jesenka, Pieckova, 1995; Lugauskas ir kt., 1997, 19... more ... 1976; Gams, 1971; Hansworth et al., 1995; Jesenka, Pieckova, 1995; Lugauskas ir kt., 1997, 1987, 2002; Milko, 1974; Nelson et al., 1993; Pitt, 1979; Rami-rez, 1988 ... es Fr.) Fr., Trichoderma polysporum (Link ex Pers.) Rifai, Verticillium album (Preuss) Pidopl., Mycelia sterilia ...

Research paper thumbnail of Inactivation of Possible Fungal Food Contaminants by Photosensitization*

CITATIONS 5 READS 16 4 authors, including: Some of the authors of this publication are also worki... more CITATIONS 5 READS 16 4 authors, including: Some of the authors of this publication are also working on these related projects: crop protection in sustainable and environmentally friendly way View project Innovative technologies for raspberry and strawberry microbiological safety and quality -SVE-02/2012 View project Zivile Luksiene

Research paper thumbnail of Functioning of Ectomycorrhizae and Soil Microfungi in Deciduous Forests Situated Along a Pollution Gradient Next to a Fertilizer Factory

Ectomycorrhizae (ECM) and soil microfungi were studied in soil cores from seven unequally pollute... more Ectomycorrhizae (ECM) and soil microfungi were studied in soil cores from seven unequally polluted forest plots spaced at different distances from a fertilizer factory in Lithuania. The abundance of ECM roots and soil microfungi was visibly different in separate investigation plots. Average amount of ECM root tips during the investigation period (2000-2002) in different forests was from 134 to 1017

Research paper thumbnail of Resistance of airborne fungal propagules to ultraviolet irradiation: Laboratory study

Lithuanian Journal of Physics, 2008

The influence of ultraviolet (UV) radiation on fungi Aspergillus niger Tiegh. isolate OG168, Paec... more 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.

Research paper thumbnail of Microbiological Reduction of Monoethanolamine Waste Toxicity

Journal of Environmental Engineering and Landscape Management, 2011

Research paper thumbnail of Field study on changes in viability of airborne fungal propagules exposed to UV radiation

Environmental Toxicology, 2004

The responses of airborne fungi to UV-B under natural conditions were investigated at the coastal... more The responses of airborne fungi to UV-B under natural conditions were investigated at the coastal station in Preila, Lithuania. Results of this investigation demonstrated that solar radiation has a marked lethal effect on outdoor airborne fungi. Sensitivity to solar radiation was the highest for the fungal propagules collected late in the evening (relative recovery 6.2%) and early morning (25.3%). The lowest sensitivity to solar radiation was observed for fungal propagules collected at midday (50.0%) and in the afternoon (53.0%). The reason for the lethal effect is thought to be elimination of the sensitive fraction of the night-time fungal populations as solar radiation gradually increases beginning at dawn. Among 356 fungus strains isolated during the investigations, 128 can be characterized as potential pathogens, and 21 strains among those most common in fungal populations belonging to plant, animal, and human pathogen groups. The collected fungal populations were exposed to solar UV-B irradiation for 2 h (from 12 p.m. to 2 p.m.). Fungal communities in the air samples were composed of saprotrophs, some of which are regarded as potential phytopathogens (Alternaria, Cladosporium, and Fusarium) or as entomopathogens (Beauveria, Paecilomyces, and Metarhizium). The airborne fungal species identified after exposure to solar radiation were predominantly: Aspergillus niger, Alternaria alternata, Cladosporium cladosporioides, Arthrinium phaerosporum, and dematiaceous sterile mycelium.

Research paper thumbnail of Pine defoliator Bupalus piniaria L.(Lepidoptera: Geometridae) and its entomopathogenic fungi: 1. Fungi isolation and testing on larvae

Ekologija, 2010

Pine defoliator bordered white moth (pine looper), Bupalus piniaria L. (Lepidoptera: Geometridae)... more Pine defoliator bordered white moth (pine looper), Bupalus piniaria L. (Lepidoptera: Geometridae) larvae were reared under laboratory conditions and were regularly supplied with pine twigs collected in nature for feeding. Cadavers of naturally infected 2nd and 3rd stage larvae were collected and analysed. Th irty-six fungal isolates belonging to 15 species and 10 genera were obtained, cultivated and identifi ed. Among them two species prevailed: Lecanicillium psalliotae (syn. Verticillium psalliotae) and Fusarium solani, comprising respectively 34.6 and 24.3% of the total number of fungi isolates. Conidial suspensions of the two fungi species at concentrations 10 5 to 10 8 conidia/ml were tested. Only the highest concentration of F. solani induced the mortality of 4th instar larvae, although the virulence was low: accumulative mortality ranged from 29.6 to 30.7% aft er 10 days of spraying. In the control group, the mortality was 15.8% aft er the same period. Th e high percentage of cadavers containing one of the two fungal species and the low mortality recorded in the test could be due to the very diff erent sensitivity to the pathogens in diff erent stage larvae. Th is is the fi rst report on the isolation and identifi cation of fungi developing on B. piniaria.

Research paper thumbnail of Mikromicetai metalų korozijos procesuose atmosferos sąlygomis

Ekologija, 2005

... 1976; Gams, 1971; Hansworth et al., 1995; Jesenka, Pieckova, 1995; Lugauskas ir kt., 1997, 19... more ... 1976; Gams, 1971; Hansworth et al., 1995; Jesenka, Pieckova, 1995; Lugauskas ir kt., 1997, 1987, 2002; Milko, 1974; Nelson et al., 1993; Pitt, 1979; Rami-rez, 1988 ... es Fr.) Fr., Trichoderma polysporum (Link ex Pers.) Rifai, Verticillium album (Preuss) Pidopl., Mycelia sterilia ...

Research paper thumbnail of Inactivation of Possible Fungal Food Contaminants by Photosensitization*

CITATIONS 5 READS 16 4 authors, including: Some of the authors of this publication are also worki... more CITATIONS 5 READS 16 4 authors, including: Some of the authors of this publication are also working on these related projects: crop protection in sustainable and environmentally friendly way View project Innovative technologies for raspberry and strawberry microbiological safety and quality -SVE-02/2012 View project Zivile Luksiene