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Statements

Subject Item
n2:RIV%2F62157124%3A16370%2F13%3A43871829%21RIV14-MSM-16370___
rdf:type
n10:Vysledek skos:Concept
dcterms:description
Polycyclic aromatic hydrocarbons represent one of the major groups of organic contaminants in the aquatic environment. Duckweed (Lemna minor L.) is a common aquatic plant widely used in phytotoxicity tests for xenobiotic substances. The goal of this study was to assess the growth and the physiological, biochemical and histochemical changes in duckweed exposed for 4 and 10 days to fluoranthene. Nonsignificant changes in number of plants, biomass production, leaf area size, content of chlorophylls a and b and carotenoids and parameters of chlorophyll fluorescence recorded after 4 and 10 days of exposure to FLT were in contrast with considerable changes at biochemical and histochemical levels. Higher occurrence of reactive oxygen species caused by an exposure to FLT after 10 days as compared to control reflected in an increase in the activities of antioxidant enzymes (superoxide dismutase by 3% in both treatments, catalase by 9% and 1% respectively, ascorbate peroxidase by 21% and 5% respectively, guaiacol peroxidase by 12% in the 0.1 mg L-1 FLT). Even the content of antioxidant compounds like ascorbate (by 20% in the 1 mg L-1 FLT) or total thiols (reduced forms by 15% in the 0.1 mg L-1 and 8% in the 1 mg L-1 FLT, oxidized forms by 36% in the 0.1 mg L-1 FLT) increased. Increased amount of ROS was followed by an increase in malondialdehyde content (by 33% in the 0.1 mg L-1 and 79% in the 1 mg L-1 FLT). Whereas in plants treated by the 0.1 mg L-1 FLT the contents of total proteins and phenols increased by 15% and 25%, respectively, the 1 mg L-1 FLT caused decrease of their contents by 32% and 7%. Microscopic observations of duckweed roots also confirmed the presence of ROS and related histochemical changes at the cellular and tissue levels. The assessment of phytotoxicity of organic pollutant in duckweed based only on the evaluation of growth parameters could not fully cover the irreversible changes already running at the level of biochemical processes. Polycyclic aromatic hydrocarbons represent one of the major groups of organic contaminants in the aquatic environment. Duckweed (Lemna minor L.) is a common aquatic plant widely used in phytotoxicity tests for xenobiotic substances. The goal of this study was to assess the growth and the physiological, biochemical and histochemical changes in duckweed exposed for 4 and 10 days to fluoranthene. Nonsignificant changes in number of plants, biomass production, leaf area size, content of chlorophylls a and b and carotenoids and parameters of chlorophyll fluorescence recorded after 4 and 10 days of exposure to FLT were in contrast with considerable changes at biochemical and histochemical levels. Higher occurrence of reactive oxygen species caused by an exposure to FLT after 10 days as compared to control reflected in an increase in the activities of antioxidant enzymes (superoxide dismutase by 3% in both treatments, catalase by 9% and 1% respectively, ascorbate peroxidase by 21% and 5% respectively, guaiacol peroxidase by 12% in the 0.1 mg L-1 FLT). Even the content of antioxidant compounds like ascorbate (by 20% in the 1 mg L-1 FLT) or total thiols (reduced forms by 15% in the 0.1 mg L-1 and 8% in the 1 mg L-1 FLT, oxidized forms by 36% in the 0.1 mg L-1 FLT) increased. Increased amount of ROS was followed by an increase in malondialdehyde content (by 33% in the 0.1 mg L-1 and 79% in the 1 mg L-1 FLT). Whereas in plants treated by the 0.1 mg L-1 FLT the contents of total proteins and phenols increased by 15% and 25%, respectively, the 1 mg L-1 FLT caused decrease of their contents by 32% and 7%. Microscopic observations of duckweed roots also confirmed the presence of ROS and related histochemical changes at the cellular and tissue levels. The assessment of phytotoxicity of organic pollutant in duckweed based only on the evaluation of growth parameters could not fully cover the irreversible changes already running at the level of biochemical processes.
dcterms:title
Lemna minor exposed to fluoranthene: Growth, biochemical, physiological and histochemical changes Lemna minor exposed to fluoranthene: Growth, biochemical, physiological and histochemical changes
skos:prefLabel
Lemna minor exposed to fluoranthene: Growth, biochemical, physiological and histochemical changes Lemna minor exposed to fluoranthene: Growth, biochemical, physiological and histochemical changes
skos:notation
RIV/62157124:16370/13:43871829!RIV14-MSM-16370___
n10:predkladatel
n19:orjk%3A16370
n3:aktivita
n17:S n17:I
n3:aktivity
I, S
n3:cisloPeriodika
september
n3:dodaniDat
n7:2014
n3:domaciTvurceVysledku
n12:9600426
n3:druhVysledku
n16:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
84677
n3:idVysledku
RIV/62157124:16370/13:43871829
n3:jazykVysledku
n5:eng
n3:klicovaSlova
histology; enzymes; ROS; chlorophyll fluorescence; Lemna minor L.; PAH fluoranthene
n3:klicoveSlovo
n6:Lemna%20minor%20L. n6:PAH%20fluoranthene n6:histology n6:enzymes n6:ROS n6:chlorophyll%20fluorescence
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[4060852A8277]
n3:nazevZdroje
Aquatic toxicology
n3:obor
n13:FR
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
4
n3:rokUplatneniVysledku
n7:2013
n3:svazekPeriodika
140
n3:tvurceVysledku
Babula, Petr Kummerová, Marie Váňová, Lucie Zezulka, Śtěpán
n3:wos
000324900800005
s:issn
0166-445X
s:numberOfPages
11
n11:doi
10.1016/j.aquatox.2013.05.011
n4:organizacniJednotka
16370