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.

充分记录到陆生作物中暴露于微囊藻毒素的不利影响。但是，人们对从土壤到植物的微囊藻毒素-LR（一种最普遍的氰毒素）的保留和生物利用度知之甚少。在本研究中，研究了暴露于三种毒素浓度和时间的两种土壤（粉质沙土和黏土壤土）中游离微囊藻毒素-LR的量。使用两种土壤类型，对紫花苜蓿的影响研究了用加水和预先加水的土壤灌溉微囊藻毒素-LR后（苜蓿）的生长，并定量了植物吸收的微囊藻毒素-LR的量。生长3周后，对每种处理的两种土壤类型中残留的游离微囊藻毒素LR的数量进行了定量。结果表明，在黏土壤土中，更多的微囊藻毒素-LR与土壤结合。但是，苜蓿的生长仅在通过灌溉的微囊藻毒素/ LR暴露的黏土壤土中受到影响。尽管如此，在通过灌溉和预加肥土壤暴露的两种苜蓿中生长的苜蓿中都检测到了微囊藻毒素-LR。有趣的是，三周后，粉沙中仍残留有更多的微囊藻毒素-LR。然而，更多的微囊藻毒素-LR被粉质沙土中生长的苜蓿吸收，与芽相比，其根部浓度更高。