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Advisor(s)
Abstract(s)
The multiple benefits agriculture provides to society depend on the long-term sustainable
management of water resources, including the preservation of a good ecological and good chemical
status of the water bodies. Presently, this good chemical status has not been reached in the majority of
European river basins. Implemented monitoring strategies are targeted to identify the presence and
magnitude of the ecological impacts that come from mixtures of chemicals but fail to give information
on the causes of the ecosystem disruptions. This work aims to contribute to assessing the quality
of surface waters used for irrigation in the LGVFX agricultural area (Central Portugal) by applying
non-conventional in vivo phytotoxicity tests on three primary producers, a monocotyledon (Sorghum
saccharatum) and two dicotyledons (Lepidium sativum and Sinapsis alba), complemented by chemical
screening and mixture-risk modelling with component-based methods (summation of risk quotients)
based on the classic concept of concentration addition (CA). Although inhibition percentages of the
phytotoxicity parameter germination and root and shoot growth may be related to the presence of
mixtures of pesticides, it was not possible to establish the fingerprinting of the detected compounds
with the observed biological effects, mostly due to the large gap of ecotoxicological data on terrestrial
plants exposed to contaminated water. In addition, pesticides can interact within the plant, leading to
antagonism and synergism phenomena.
Description
Keywords
irrigation waters risk assessment pesticide mixtures bioassays phytotoxicity
Pedagogical Context
Citation
Silva, E.; Narciso, G.A.; Castro, J.C. Unravelling relationships between in vivo effects on plants and detected pesticide mixtures in freshwaters of a South-European agro-ecosystem. Water 2023, 15, 2936
Publisher
MDPI