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UVB radiation as a potential selective factor favoring microcystin producing bloom forming cyanobacteria
ID
Ding, Yi
(
Avtor
),
ID
Song, Lirong
(
Avtor
),
ID
Sedmak, Bojan
(
Avtor
)
URL - Predstavitvena datoteka, za dostop obiščite
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0073919
Galerija slik
Izvleček
Due to the stratospheric ozone depletion, several organisms will become exposed to increased biologically active UVB (280-320 nm) radiation, not only at polar but also at temperate and tropical latitudes. Bloom forming cyanobacteria are exposed to UVB radiation on a mass scale, particularly during the surface bloom and scum formation that can persist for long periods of time. All buoyant species of cyanobacteria are at least periodically exposed to higher irradiation during their vertical migration to the surface that usually occurs several times a day. The aim of this study is to assess the influence on cyanobacteria of UVB radiation at realistic environmental intensities. The effects of two UVB intensities of 0.5 and 0.99 W/m2 in up to 0.5 cm water depth were studied in vitro on Microcystis aeruginosa strains, two microcystin producing and one non-producing. After UVB exposure their ability to proliferate was estimated by cell counting, while cell fitness and integrity were evaluated using light microscopy, autofluorescence and immunofluorescence. Gene damage was assessed by TUNEL assay and SYBR Green staining of the nucleoide area. We conclude that UVB exposure causes damage tothe genetic material, cytoskeletal elements, higher sedimentation rates and consequent cell death. In contrast to microcystin producers (PCC7806 and FACHB905), the microcystin non-producing strain PCC7005 is more susceptible tothe deleterious effects of radiation, with weak recovery ability. The ecological relevance of the results is discussed using data from eleven yearsʼcontinuous UVB radiation measurements within the area of Ljubljana city (Slovenia, Central Europe). Our results suggest that increased solar radiationin temperate latitudes can have its strongest effect during cyanobacterial bloom formation in spring and early summer. UVB radiation in this period may significantly influence strain composition of cyanobacterial blooms in favor of microcystin producers.
Jezik:
Angleški jezik
Ključne besede:
microcystin
,
cyanobacteria
Vrsta gradiva:
Delo ni kategorizirano
Tipologija:
1.01 - Izvirni znanstveni članek
Organizacija:
BF - Biotehniška fakulteta
Leto izida:
2013
Št. strani:
Str. e73919
Številčenje:
Vol. 8, issue 9
PID:
20.500.12556/RUL-37739
UDK:
577
ISSN pri članku:
1932-6203
DOI:
10.1371/journal.pone.0073919
COBISS.SI-ID:
2888271
Datum objave v RUL:
10.07.2015
Število ogledov:
1268
Število prenosov:
437
Metapodatki:
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Objavi na:
Gradivo je del revije
Naslov:
PloS one
Založnik:
PLOS
ISSN:
1932-6203
COBISS.SI-ID:
2005896
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