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Accumulation and Inhibitory Effects of Microcystin on the Growth of Rice and Broccoli KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/278110
pp.19-30
Microcystins (MCs) produced by cyanobacteria are severe hepatotoxins for mammalian and protein phosphatase inhibitors. Irrigation water for grain and vegetables is often contaminated with cyanobacteria and microcystin during warm seasons. We assessed the effects of various concentrations (0, 0.01 to 10 μg mL-1) of microcystin-LR (MC-LR) and microcystin-RR (MC-RR) exposure on Oryza sativa (rice) and Brassica oleraces var. italica (broccoli). The EC50 of leaves and roots of rice was 0.9 and 1.1 μg MC-LRmL-1, respectively. The no observed effect level (NOEL) of rice was less than 0.1 μg mL-1 (100 μg L-1). The EC50 of the stems and roots of broccoli was 8.7 and 7.2 μg MC-RR mL-1, respectively. There was no difference in the germination rate of broccoli among microcystin-RR concentrations. After exposure to 0, 0.01 to 10 μg mL-1 MC-RR for seven days, 14, 89 and 154 ng mg-1 (dry weight) MC-RR accumulated in B. oleracea. These EC50 values showed that microcystin-LR and -RR affected the growth of rice and broccoli. These findings suggest that MC is carried into terrestrial ecosystems via irrigation, and that the biota of higher ecological niches can be influenced by MC through bioaccumulation. Therefore, a guideline for MC concentrations in irrigation water should be set using the NOEL.
