Naslov
The effect of tembotrione (HPPD-inhibiting herbicide) on photosynthetic efficiency of duckweed (<i>Spirodela polyrhiza</i> L.), a non-target species

Autori
Peršić, Vesna ; Antunović Dunić, Jasenka ; Domjan, Lucija

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

Izvornik
Scientific symposium Soil Ecotoxicology - Theory and Application / - , 2019, 17-17

Skup
Scientific symposium Soil Ecotoxicology - Theory and Application

Mjesto i datum
Osijek, Hrvatska, 27.06.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Podatak o recenziji nije dostupan

Ključne riječi
Chlorophyll fluorescence, toxicity, photosynthesis

Sažetak
Nowadays, pesticide application has become the dominant method for controlling pests and diseases in plant production and, in addition to other ecological problems, significantly contributes to the degradation of aquatic ecosystems where can affect non-target species. The goal of this investigation was to evaluate the effect of tembotrione (TBT), HPPD- inhibiting herbicide, in ecologically relevant concentrations on the free-floating macrophyte <i>Spirodela polyrhiza</i> L. Plants were exposed to the range of TBT concentrations from low, corresponding to concentrations predicted in the aquatic environment (30 ug a.u. l^-1), to higher concentrations (300 ug a.u. l^-1, 3 and 30 mg a.u. l^-1). Chlorophyll fluorescence was used as a method of assessing the photosynthesis efficiency in response to stress conditions. By analysing the polyphase increase of chlorophyll fluorescence with OJIP test, after 24 hours of exposure to TBT, it was determined that TBT has a more pronounced effect on the young daughter fronds. In fully developed plants (mother- fronds), TBT induced a more significant effect on light-dependent reactions and a slight decrease of photosynthesis efficiency in combination with a smaller increase in non- photochemical energy dissipation per reaction centre. In young plants, it was found that dark reactions are more sensitive to the effect of TBT and that there is a significant increase in non- photochemical energy dissipation even at low concentrations of TBT. The results showed that treatment with tembotrione causes different and significant changes in electron transport in the active reaction centres of underdeveloped, but also of fully developed plants. Therefore, it can be concluded that energy flows and photosynthesis driving forces can generate useful information on the behaviour of photosystems of aquatic plants that can be used to determine the heterogeneity of photosystems in aquatic plants at different developmental stages and under stressful conditions. These results draw attention to the need for more investigations of toxic effects of pesticides on non-target organisms at both low or environmentally relevant concentrations and different development stages.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA