Naslov
Photosynthetic responses of aquatic plant Lemna minor after multiplied pulsed pesticide exposures

Autori
Moslavac, Marko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts of the 6th Croatian Botanical Symposium with International Participation / Jasprica, Nenad ; Car, Ana - Zagreb : Hrvatsko Botaničko Društvo, 2019, 53-53

ISBN
978-953-8097-02-7

Skup
6. hrvatski botanički simpozij = 6th Croatian Botanical Symposium

Mjesto i datum
Zagreb, Hrvatska, 30.08.2019. - 01.09.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Common duckweed ; Herbicide ; Isoproturon ; Photosynthetic pigments ; Sequential pulses

Sažetak
The maximum concentrations of pesticides in aquatic ecosystems are frequently present for short periods. Hence, aquatic non-target species are exposed to fluctuating pesticide concentrations. These sequential pulses, which are usually associated with spray drift, precipitation and surface runoff events, can reach concentrations that would affect non- target organisms. Standard ecotoxicity tests employ set durations with continuous exposure conditions. Thus, these approaches not provide a truly estimate of the impacts of a certain toxicant on organisms in the real ecosystem. The overall aim of this study was to assess the effects of isoproturon pulses on the changes in content of photosynthetic pigments, in particular chlorophyll a, chlorophyll b, total chlorophyll and carotenoids in Lemna minor. Isoproturon is a phenylurea systemic herbicide for the control of monocot and dicot weeds, and it is extensively used in conventional agricultural production. Duckweeds were treated with 50, 100, 150 and 200 µg L-1 of isoproturon (48 h of pulse treatment followed by 5 day recovery period) during 21 days. Herbicide treatment caused a significant decrease in photosynthetic pigments content, which is in the mode of action of this herbicide. Due to the toxic effects of isoproturon on L. minor, there is a potential negative impact of this toxicant on non-target plant communities in aquatic ecosystems. Results gained in the present study should support the effect assessment of multiplied exposures and fluctuating pesticide concentrations. Moreover, such experiments parallel with standard ecotoxicity tests, can contribute to a more accurate environmental risk assessment.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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