Bioavailability of microcystin-LR in two different soil types to the legume Alfalfa Medicago sativa L.

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Esterhuizen , M , Schmitner , N & Pflugmacher , S 2021 , ' Bioavailability of microcystin-LR in two different soil types to the legume Alfalfa Medicago sativa L. ' , International Journal of Environmental Science and Technology , vol. 18 , pp. 3845-3854 . https://doi.org/10.1007/s13762-021-03132-5

Title: Bioavailability of microcystin-LR in two different soil types to the legume Alfalfa Medicago sativa L.
Author: Esterhuizen, Maranda; Schmitner, Nicole; Pflugmacher, Stephan
Other contributor: University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)


Date: 2021-12
Language: eng
Number of pages: 10
Belongs to series: International Journal of Environmental Science and Technology
ISSN: 1735-1472
DOI: https://doi.org/10.1007/s13762-021-03132-5
URI: http://hdl.handle.net/10138/335775
Abstract: The adverse effects of exposure to microcystins in terrestrial crops have been well documented. However, the retention and bioavailability of microcystin-LR, one of the most prevalent cyanotoxins, from soil to plants, is poorly understood. In the present study, the amount of free microcystin-LR from two soil types, a silty sand and clayey loam, with exposure to three toxin concentrations and time was investigated. Using the two soil types, the effects on Medicago sativa (Alfalfa) growth after microcystin-LR exposure via irrigation with spiked water and pre-spiked soil was investigated and the amount of microcystin-LR taken up by the plant quantified. After 3 weeks of growth, the amount of free microcystin-LR remaining in the two soil types with each treatment was quantified. The results indicated that in clayey loam more microcystin-LR is bound to the soil. However, the growth of Alfalfa was only affected in the clayey loam with microcystin/LR exposure via irrigation. Nevertheless, microcystin-LR was detected in Alfalfa grown in both soil types exposed by both irrigation and via pre-spiked soil. Interestingly, more microcystin-LR remained in the silty sand after 3 weeks; yet, more microcystin-LR was taken up by the Alfalfa grown in the silty sand, with a larger concentration in the roots compared to the shoots. The results indicate that the soil type substantially influences the bioavailability and uptake of microcystin-LR and present some insight into the ecological risk posed by microcystin-LR.
Subject: Absorption
Clayey loam
Crop plants
Cyanobacterial toxins
Hepatotoxin
Silty sand
Uptake
1172 Environmental sciences
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